diff --git a/src/auth/profile-detector.ts b/src/auth/profile-detector.ts
index aa537df7..cefa4fbb 100644
--- a/src/auth/profile-detector.ts
+++ b/src/auth/profile-detector.ts
@@ -14,12 +14,12 @@ import * as path from 'path';
 import * as os from 'os';
 import { findSimilarStrings } from '../utils/helpers';
 import { Config, Settings, ProfileMetadata } from '../types';
-import { UnifiedConfig } from '../config/unified-config-types';
+import { UnifiedConfig, CopilotConfig } from '../config/unified-config-types';
 import { hasUnifiedConfig, loadUnifiedConfig } from '../config/unified-config-loader';
 import { getProfileSecrets } from '../config/secrets-manager';
 import { isUnifiedConfigEnabled } from '../config/feature-flags';
 
-export type ProfileType = 'settings' | 'account' | 'cliproxy' | 'default';
+export type ProfileType = 'settings' | 'account' | 'cliproxy' | 'copilot' | 'default';
 
 /** CLIProxy profile names (OAuth-based, zero config) */
 export const CLIPROXY_PROFILES = ['gemini', 'codex', 'agy', 'qwen'] as const;
@@ -35,6 +35,8 @@ export interface ProfileDetectionResult {
   provider?: CLIProxyProfileName;
   /** For unified config profiles: merged env vars (config + secrets) */
   env?: Record<string, string>;
+  /** For copilot profile: the copilot config */
+  copilotConfig?: CopilotConfig;
 }
 
 export interface AllProfiles {
@@ -182,6 +184,7 @@ class ProfileDetector {
    *
    * Priority order:
    * 0. Hardcoded CLIProxy profiles (gemini, codex, agy, qwen)
+   * 0.5. Copilot profile (if enabled in config)
    * 1. Unified config profiles (if config.yaml exists or CCS_UNIFIED_CONFIG=1)
    * 2. User-defined CLIProxy variants (config.cliproxy section) [legacy]
    * 3. Settings-based profiles (config.profiles section) [legacy]
@@ -202,6 +205,36 @@ class ProfileDetector {
       };
     }
 
+    // Priority 0.5: Check Copilot profile - GitHub Copilot subscription via copilot-api
+    if (profileName === 'copilot') {
+      const unifiedConfig = this.readUnifiedConfig();
+      const copilotConfig = unifiedConfig?.copilot;
+
+      if (!copilotConfig?.enabled) {
+        const error = new Error(
+          'Copilot profile is not enabled.\n\n' +
+            'To enable GitHub Copilot integration:\n' +
+            '  1. Run: ccs config\n' +
+            '  2. Go to "GitHub Copilot" section\n' +
+            '  3. Enable the integration\n' +
+            '  4. Authenticate with GitHub: npx copilot-api auth\n\n' +
+            'Or manually edit ~/.ccs/config.yaml:\n' +
+            '  copilot:\n' +
+            '    enabled: true'
+        ) as ProfileNotFoundError;
+        error.profileName = profileName;
+        error.suggestions = [];
+        error.availableProfiles = this.listAvailableProfiles();
+        throw error;
+      }
+
+      return {
+        type: 'copilot',
+        name: 'copilot',
+        copilotConfig,
+      };
+    }
+
     // Priority 1: Try unified config if available
     const unifiedConfig = this.readUnifiedConfig();
     if (unifiedConfig) {
@@ -327,6 +360,12 @@ class ProfileDetector {
     // Check unified config first
     const unifiedConfig = this.readUnifiedConfig();
     if (unifiedConfig) {
+      // Copilot profile (if enabled)
+      if (unifiedConfig.copilot?.enabled) {
+        lines.push('GitHub Copilot (via copilot-api):');
+        lines.push(`  - copilot (model: ${unifiedConfig.copilot.model})`);
+      }
+
       // CLIProxy variants from unified config
       const variants = Object.keys(unifiedConfig.cliproxy?.variants || {});
       if (variants.length > 0) {
diff --git a/src/ccs.ts b/src/ccs.ts
index 437156a1..288b6873 100644
--- a/src/ccs.ts
+++ b/src/ccs.ts
@@ -343,6 +343,27 @@ async function main(): Promise<void> {
     return;
   }
 
+  // Special case: copilot command (GitHub Copilot integration)
+  // Only route to command handler for known subcommands, otherwise treat as profile
+  const COPILOT_SUBCOMMANDS = [
+    'auth',
+    'status',
+    'models',
+    'start',
+    'stop',
+    'enable',
+    'disable',
+    'help',
+    '--help',
+    '-h',
+  ];
+  if (firstArg === 'copilot' && args.length > 1 && COPILOT_SUBCOMMANDS.includes(args[1])) {
+    // `ccs copilot <subcommand>` - route to copilot command handler
+    const { handleCopilotCommand } = await import('./commands/copilot-command');
+    const exitCode = await handleCopilotCommand(args.slice(1));
+    process.exit(exitCode);
+  }
+
   // Special case: headless delegation (-p flag)
   if (args.includes('-p') || args.includes('--prompt')) {
     const { DelegationHandler } = await import('./delegation/delegation-handler');
@@ -389,6 +410,16 @@ async function main(): Promise<void> {
       const provider = profileInfo.provider || (profileInfo.name as CLIProxyProvider);
       const customSettingsPath = profileInfo.settingsPath; // undefined for hardcoded profiles
       await execClaudeWithCLIProxy(claudeCli, provider, remainingArgs, { customSettingsPath });
+    } else if (profileInfo.type === 'copilot') {
+      // COPILOT FLOW: GitHub Copilot subscription via copilot-api proxy
+      const { executeCopilotProfile } = await import('./copilot');
+      const copilotConfig = profileInfo.copilotConfig;
+      if (!copilotConfig) {
+        console.error('[X] Copilot configuration not found');
+        process.exit(1);
+      }
+      const exitCode = await executeCopilotProfile(copilotConfig, remainingArgs);
+      process.exit(exitCode);
     } else if (profileInfo.type === 'settings') {
       // Settings-based profiles (glm, glmt, kimi) are third-party providers
       // WebSearch is server-side tool - third-party providers have no access
diff --git a/src/commands/copilot-command.ts b/src/commands/copilot-command.ts
new file mode 100644
index 00000000..09c0904b
--- /dev/null
+++ b/src/commands/copilot-command.ts
@@ -0,0 +1,266 @@
+/**
+ * Copilot CLI Command
+ *
+ * Handles `ccs copilot <subcommand>` commands.
+ */
+
+import {
+  startAuthFlow,
+  getCopilotStatus,
+  startDaemon,
+  stopDaemon,
+  getAvailableModels,
+  isCopilotApiInstalled,
+} from '../copilot';
+import { loadOrCreateUnifiedConfig, saveUnifiedConfig } from '../config/unified-config-loader';
+import { DEFAULT_COPILOT_CONFIG } from '../config/unified-config-types';
+
+/**
+ * Handle copilot subcommand.
+ */
+export async function handleCopilotCommand(args: string[]): Promise<number> {
+  const subcommand = args[0];
+
+  switch (subcommand) {
+    case 'auth':
+      return handleAuth();
+    case 'status':
+      return handleStatus();
+    case 'models':
+      return handleModels();
+    case 'start':
+      return handleStart();
+    case 'stop':
+      return handleStop();
+    case 'enable':
+      return handleEnable();
+    case 'disable':
+      return handleDisable();
+    case undefined:
+    case 'help':
+    case '--help':
+    case '-h':
+      return handleHelp();
+    default:
+      console.error(`[X] Unknown subcommand: ${subcommand}`);
+      console.error('');
+      return handleHelp();
+  }
+}
+
+/**
+ * Show help for copilot commands.
+ */
+function handleHelp(): number {
+  console.log('GitHub Copilot Integration');
+  console.log('');
+  console.log('Usage: ccs copilot <subcommand>');
+  console.log('');
+  console.log('Subcommands:');
+  console.log('  auth      Start GitHub OAuth authentication');
+  console.log('  status    Show authentication and daemon status');
+  console.log('  models    List available models');
+  console.log('  start     Start copilot-api daemon');
+  console.log('  stop      Stop copilot-api daemon');
+  console.log('  enable    Enable copilot integration');
+  console.log('  disable   Disable copilot integration');
+  console.log('  help      Show this help message');
+  console.log('');
+  console.log('Quick start:');
+  console.log('  1. ccs copilot auth     # Authenticate with GitHub');
+  console.log('  2. ccs copilot enable   # Enable integration');
+  console.log('  3. ccs copilot start    # Start daemon');
+  console.log('');
+  console.log('Or use the web UI: ccs config → Copilot tab');
+  console.log('');
+  return 0;
+}
+
+/**
+ * Handle auth subcommand.
+ */
+async function handleAuth(): Promise<number> {
+  if (!isCopilotApiInstalled()) {
+    console.error('[X] copilot-api is not installed.');
+    console.error('');
+    console.error('Install with: npm install -g copilot-api');
+    return 1;
+  }
+
+  const result = await startAuthFlow();
+
+  if (result.success) {
+    console.log('');
+    console.log('[OK] Authentication successful!');
+    console.log('');
+    console.log('Next steps:');
+    console.log('  1. Enable copilot: ccs copilot enable');
+    console.log('  2. Start daemon:   npx copilot-api start');
+    console.log('  3. Use copilot:    ccs copilot');
+    return 0;
+  } else {
+    console.error('');
+    console.error(`[X] ${result.error}`);
+    return 1;
+  }
+}
+
+/**
+ * Handle status subcommand.
+ */
+async function handleStatus(): Promise<number> {
+  const config = loadOrCreateUnifiedConfig();
+  const copilotConfig = config.copilot ?? DEFAULT_COPILOT_CONFIG;
+
+  const status = await getCopilotStatus(copilotConfig);
+
+  console.log('GitHub Copilot Status');
+  console.log('─────────────────────');
+  console.log('');
+
+  // Enabled status
+  const enabledIcon = copilotConfig.enabled ? '[OK]' : '[X]';
+  const enabledText = copilotConfig.enabled ? 'Enabled' : 'Disabled';
+  console.log(`Integration:    ${enabledIcon} ${enabledText}`);
+
+  // Auth status
+  const authIcon = status.auth.authenticated ? '[OK]' : '[X]';
+  const authText = status.auth.authenticated ? 'Authenticated' : 'Not authenticated';
+  console.log(`Authentication: ${authIcon} ${authText}`);
+
+  // Daemon status
+  const daemonIcon = status.daemon.running ? '[OK]' : '[X]';
+  const daemonText = status.daemon.running ? 'Running' : 'Not running';
+  console.log(`Daemon:         ${daemonIcon} ${daemonText}`);
+
+  console.log('');
+  console.log('Configuration:');
+  console.log(`  Port:         ${copilotConfig.port}`);
+  console.log(`  Model:        ${copilotConfig.model}`);
+  console.log(`  Account Type: ${copilotConfig.account_type}`);
+  console.log(`  Auto-start:   ${copilotConfig.auto_start ? 'Yes' : 'No'}`);
+
+  if (copilotConfig.rate_limit !== null) {
+    console.log(`  Rate Limit:   ${copilotConfig.rate_limit}s`);
+  }
+
+  console.log('');
+
+  // Show next steps if not fully configured
+  if (!copilotConfig.enabled || !status.auth.authenticated || !status.daemon.running) {
+    console.log('Next steps:');
+    if (!copilotConfig.enabled) {
+      console.log('  - Enable:      ccs copilot enable');
+    }
+    if (!status.auth.authenticated) {
+      console.log('  - Auth:        ccs copilot auth');
+    }
+    if (!status.daemon.running) {
+      console.log('  - Start:       ccs copilot start');
+    }
+  }
+
+  return 0;
+}
+
+/**
+ * Handle models subcommand.
+ */
+async function handleModels(): Promise<number> {
+  const config = loadOrCreateUnifiedConfig();
+  const copilotConfig = config.copilot ?? DEFAULT_COPILOT_CONFIG;
+
+  console.log('Available Copilot Models');
+  console.log('────────────────────────');
+  console.log('');
+
+  const models = await getAvailableModels(copilotConfig.port);
+
+  for (const model of models) {
+    const current = model.id === copilotConfig.model ? ' [CURRENT]' : '';
+    const defaultMark = model.isDefault ? ' (default)' : '';
+    console.log(`  ${model.id}${current}${defaultMark}`);
+    console.log(`    Provider: ${model.provider}`);
+  }
+
+  console.log('');
+  console.log('To change model: ccs config (Copilot section)');
+
+  return 0;
+}
+
+/**
+ * Handle start subcommand.
+ */
+async function handleStart(): Promise<number> {
+  const config = loadOrCreateUnifiedConfig();
+  const copilotConfig = config.copilot ?? DEFAULT_COPILOT_CONFIG;
+
+  console.log(`[i] Starting copilot-api daemon on port ${copilotConfig.port}...`);
+
+  const result = await startDaemon(copilotConfig);
+
+  if (result.success) {
+    console.log(`[OK] Daemon started (PID: ${result.pid})`);
+    return 0;
+  } else {
+    console.error(`[X] ${result.error}`);
+    return 1;
+  }
+}
+
+/**
+ * Handle stop subcommand.
+ */
+async function handleStop(): Promise<number> {
+  console.log('[i] Stopping copilot-api daemon...');
+
+  const result = await stopDaemon();
+
+  if (result.success) {
+    console.log('[OK] Daemon stopped');
+    return 0;
+  } else {
+    console.error(`[X] ${result.error}`);
+    return 1;
+  }
+}
+
+/**
+ * Handle enable subcommand.
+ */
+async function handleEnable(): Promise<number> {
+  const config = loadOrCreateUnifiedConfig();
+
+  if (!config.copilot) {
+    config.copilot = { ...DEFAULT_COPILOT_CONFIG };
+  }
+
+  config.copilot.enabled = true;
+  saveUnifiedConfig(config);
+
+  console.log('[OK] Copilot integration enabled');
+  console.log('');
+  console.log('Next steps:');
+  console.log('  1. Authenticate: ccs copilot auth');
+  console.log('  2. Start daemon: ccs copilot start');
+  console.log('  3. Use:          ccs copilot');
+
+  return 0;
+}
+
+/**
+ * Handle disable subcommand.
+ */
+async function handleDisable(): Promise<number> {
+  const config = loadOrCreateUnifiedConfig();
+
+  if (config.copilot) {
+    config.copilot.enabled = false;
+    saveUnifiedConfig(config);
+  }
+
+  console.log('[OK] Copilot integration disabled');
+
+  return 0;
+}
diff --git a/src/commands/help-command.ts b/src/commands/help-command.ts
index 350e7d9b..618dfd23 100644
--- a/src/commands/help-command.ts
+++ b/src/commands/help-command.ts
@@ -173,6 +173,27 @@ Claude Code Profile & Model Switcher`.trim();
     ]
   );
 
+  // ═══════════════════════════════════════════════════════════════════════════
+  // MAJOR SECTION 4: GitHub Copilot Integration
+  // ═══════════════════════════════════════════════════════════════════════════
+  printMajorSection(
+    'GitHub Copilot Integration',
+    [
+      'Use your GitHub Copilot subscription with Claude Code',
+      'Requires: npm install -g copilot-api',
+    ],
+    [
+      ['ccs copilot', 'Use Copilot as API backend'],
+      ['ccs copilot auth', 'Authenticate with GitHub'],
+      ['ccs copilot status', 'Show integration status'],
+      ['ccs copilot models', 'List available models'],
+      ['ccs copilot start', 'Start copilot-api daemon'],
+      ['ccs copilot stop', 'Stop copilot-api daemon'],
+      ['ccs copilot enable', 'Enable integration'],
+      ['ccs copilot disable', 'Disable integration'],
+    ]
+  );
+
   // ═══════════════════════════════════════════════════════════════════════════
   // SUB-SECTIONS (simpler styling)
   // ═══════════════════════════════════════════════════════════════════════════
diff --git a/src/config/reserved-names.ts b/src/config/reserved-names.ts
index 657e5d78..25262265 100644
--- a/src/config/reserved-names.ts
+++ b/src/config/reserved-names.ts
@@ -9,6 +9,8 @@ export const RESERVED_PROFILE_NAMES = [
   'agy',
   'qwen',
   'iflow',
+  // Copilot API (GitHub Copilot proxy)
+  'copilot',
   // CLI commands and special names
   'default',
   'config',
diff --git a/src/config/unified-config-loader.ts b/src/config/unified-config-loader.ts
index 04394694..de6efa48 100644
--- a/src/config/unified-config-loader.ts
+++ b/src/config/unified-config-loader.ts
@@ -14,6 +14,7 @@ import {
   isUnifiedConfig,
   createEmptyUnifiedConfig,
   UNIFIED_CONFIG_VERSION,
+  DEFAULT_COPILOT_CONFIG,
 } from './unified-config-types';
 import { isUnifiedConfigEnabled } from './feature-flags';
 
@@ -159,6 +160,16 @@ function mergeWithDefaults(partial: Partial<UnifiedConfig>): UnifiedConfig {
       // Legacy fields (keep for backwards compatibility during read)
       gemini: partial.websearch?.gemini,
     },
+    // Copilot config - strictly opt-in, merge with defaults
+    copilot: {
+      enabled: partial.copilot?.enabled ?? DEFAULT_COPILOT_CONFIG.enabled,
+      auto_start: partial.copilot?.auto_start ?? DEFAULT_COPILOT_CONFIG.auto_start,
+      port: partial.copilot?.port ?? DEFAULT_COPILOT_CONFIG.port,
+      account_type: partial.copilot?.account_type ?? DEFAULT_COPILOT_CONFIG.account_type,
+      rate_limit: partial.copilot?.rate_limit ?? DEFAULT_COPILOT_CONFIG.rate_limit,
+      wait_on_limit: partial.copilot?.wait_on_limit ?? DEFAULT_COPILOT_CONFIG.wait_on_limit,
+      model: partial.copilot?.model ?? DEFAULT_COPILOT_CONFIG.model,
+    },
   };
 }
 
@@ -302,6 +313,29 @@ function generateYamlWithComments(config: UnifiedConfig): string {
     lines.push('');
   }
 
+  // Copilot section (GitHub Copilot proxy)
+  if (config.copilot) {
+    lines.push('# ----------------------------------------------------------------------------');
+    lines.push('# Copilot: GitHub Copilot API proxy (via copilot-api)');
+    lines.push('# Uses your existing GitHub Copilot subscription with Claude Code.');
+    lines.push('#');
+    lines.push('# !! DISCLAIMER - USE AT YOUR OWN RISK !!');
+    lines.push('# This uses an UNOFFICIAL reverse-engineered API.');
+    lines.push('# Excessive usage may trigger GitHub account restrictions.');
+    lines.push('# CCS provides NO WARRANTY and accepts NO RESPONSIBILITY for consequences.');
+    lines.push('#');
+    lines.push('# Setup: npx copilot-api auth (authenticate with GitHub)');
+    lines.push('# Usage: ccs copilot (switch to copilot profile)');
+    lines.push('#');
+    lines.push('# Models: claude-sonnet-4.5, claude-opus-4.5, gpt-5.1, gemini-2.5-pro');
+    lines.push('# Account types: individual, business, enterprise');
+    lines.push('# ----------------------------------------------------------------------------');
+    lines.push(
+      yaml.dump({ copilot: config.copilot }, { indent: 2, lineWidth: -1, quotingType: '"' }).trim()
+    );
+    lines.push('');
+  }
+
   return lines.join('\n');
 }
 
diff --git a/src/config/unified-config-types.ts b/src/config/unified-config-types.ts
index 75cbfe31..a692173c 100644
--- a/src/config/unified-config-types.ts
+++ b/src/config/unified-config-types.ts
@@ -13,8 +13,9 @@
  * Unified config version.
  * Version 2 = YAML unified format
  * Version 3 = WebSearch config with model configuration for Gemini/OpenCode
+ * Version 4 = Copilot API integration (GitHub Copilot proxy)
  */
-export const UNIFIED_CONFIG_VERSION = 3;
+export const UNIFIED_CONFIG_VERSION = 4;
 
 /**
  * Account configuration (formerly in profiles.json).
@@ -148,6 +149,42 @@ export interface WebSearchProvidersConfig {
   opencode?: OpenCodeWebSearchConfig;
 }
 
+/**
+ * Copilot API account type.
+ */
+export type CopilotAccountType = 'individual' | 'business' | 'enterprise';
+
+/**
+ * Copilot API configuration.
+ * Enables GitHub Copilot subscription usage via copilot-api proxy.
+ * Strictly opt-in - disabled by default.
+ *
+ * !! DISCLAIMER - USE AT YOUR OWN RISK !!
+ * This uses an UNOFFICIAL reverse-engineered API.
+ * Excessive usage may trigger GitHub account restrictions.
+ * CCS provides NO WARRANTY and accepts NO RESPONSIBILITY for any consequences.
+ */
+export interface CopilotConfig {
+  /** Enable Copilot integration (default: false) - must be explicitly enabled */
+  enabled: boolean;
+  /** Auto-start copilot-api daemon when using profile (default: false) */
+  auto_start: boolean;
+  /** Port for copilot-api proxy (default: 4141) */
+  port: number;
+  /** GitHub Copilot account type (default: individual) */
+  account_type: CopilotAccountType;
+  /** Rate limit in seconds between requests (null = no limit) */
+  rate_limit: number | null;
+  /** Wait instead of error when rate limit is hit (default: true) */
+  wait_on_limit: boolean;
+  /** Default model ID (e.g., claude-sonnet-4.5) */
+  model: string;
+  /** Model mapping for Claude tiers - maps opus/sonnet/haiku to specific models */
+  opus_model?: string;
+  sonnet_model?: string;
+  haiku_model?: string;
+}
+
 /**
  * WebSearch configuration.
  * Uses CLI tools (Gemini CLI, Grok CLI, OpenCode) for third-party profiles.
@@ -183,7 +220,7 @@ export interface WebSearchConfig {
  * Stored in ~/.ccs/config.yaml
  */
 export interface UnifiedConfig {
-  /** Config version (2 for unified format) */
+  /** Config version (4 for copilot support) */
   version: number;
   /** Default profile name to use when none specified */
   default?: string;
@@ -197,6 +234,8 @@ export interface UnifiedConfig {
   preferences: PreferencesConfig;
   /** WebSearch configuration */
   websearch?: WebSearchConfig;
+  /** Copilot API configuration (GitHub Copilot proxy) */
+  copilot?: CopilotConfig;
 }
 
 /**
@@ -211,6 +250,21 @@ export interface SecretsConfig {
   profiles: Record<string, Record<string, string>>;
 }
 
+/**
+ * Default Copilot configuration.
+ * Strictly opt-in - disabled by default.
+ * Uses gpt-4.1 as default model (free tier compatible).
+ */
+export const DEFAULT_COPILOT_CONFIG: CopilotConfig = {
+  enabled: false,
+  auto_start: false,
+  port: 4141,
+  account_type: 'individual',
+  rate_limit: null,
+  wait_on_limit: true,
+  model: 'gpt-4.1', // Free tier compatible
+};
+
 /**
  * Create an empty unified config with defaults.
  */
@@ -253,6 +307,7 @@ export function createEmptyUnifiedConfig(): UnifiedConfig {
         },
       },
     },
+    copilot: { ...DEFAULT_COPILOT_CONFIG },
   };
 }
 
diff --git a/src/copilot/copilot-auth.ts b/src/copilot/copilot-auth.ts
new file mode 100644
index 00000000..81d6fdf6
--- /dev/null
+++ b/src/copilot/copilot-auth.ts
@@ -0,0 +1,206 @@
+/**
+ * Copilot Auth Handler
+ *
+ * Handles GitHub OAuth authentication for copilot-api.
+ * Uses local installation from ~/.ccs/copilot/ (managed by copilot-package-manager).
+ */
+
+import { spawn } from 'child_process';
+import * as fs from 'fs';
+import * as path from 'path';
+import * as os from 'os';
+import { CopilotAuthStatus, CopilotDebugInfo } from './types';
+import {
+  isCopilotApiInstalled as checkInstalled,
+  getCopilotApiBinPath,
+} from './copilot-package-manager';
+
+/**
+ * Get the path to copilot-api's GitHub token file.
+ * copilot-api stores tokens in ~/.local/share/copilot-api/github_token (Linux/macOS)
+ * or %APPDATA%/copilot-api/github_token (Windows)
+ */
+export function getTokenPath(): string {
+  if (process.platform === 'win32') {
+    return path.join(process.env.APPDATA || os.homedir(), 'copilot-api', 'github_token');
+  }
+  return path.join(os.homedir(), '.local', 'share', 'copilot-api', 'github_token');
+}
+
+/**
+ * Check if GitHub token file exists.
+ * Fast check that doesn't require spawning copilot-api process.
+ */
+export function hasTokenFile(): boolean {
+  try {
+    return fs.existsSync(getTokenPath());
+  } catch {
+    return false;
+  }
+}
+
+/**
+ * Check if copilot-api is installed locally.
+ * Uses copilot-package-manager to check ~/.ccs/copilot/node_modules/.bin/copilot-api
+ */
+export function isCopilotApiInstalled(): boolean {
+  return checkInstalled();
+}
+
+/**
+ * Get copilot-api debug info.
+ * Returns authentication status and version info.
+ */
+export async function getCopilotDebugInfo(): Promise<CopilotDebugInfo | null> {
+  const binPath = getCopilotApiBinPath();
+
+  return new Promise((resolve) => {
+    try {
+      const proc = spawn(binPath, ['debug', '--json'], {
+        stdio: ['ignore', 'pipe', 'pipe'],
+        shell: process.platform === 'win32',
+        timeout: 15000,
+      });
+
+      let stdout = '';
+      let _stderr = '';
+
+      proc.stdout.on('data', (data) => {
+        stdout += data.toString();
+      });
+
+      proc.stderr.on('data', (data) => {
+        _stderr += data.toString();
+      });
+
+      proc.on('close', (code) => {
+        if (code === 0 && stdout) {
+          try {
+            const info = JSON.parse(stdout.trim()) as CopilotDebugInfo;
+            resolve(info);
+          } catch {
+            resolve(null);
+          }
+        } else {
+          resolve(null);
+        }
+      });
+
+      proc.on('error', () => {
+        resolve(null);
+      });
+
+      // Timeout after 15 seconds
+      setTimeout(() => {
+        proc.kill();
+        resolve(null);
+      }, 15000);
+    } catch {
+      resolve(null);
+    }
+  });
+}
+
+/**
+ * Check copilot authentication status.
+ * Uses fast token file check first, falls back to copilot-api debug if needed.
+ */
+export async function checkAuthStatus(): Promise<CopilotAuthStatus> {
+  // Fast path: check if token file exists (instant, no subprocess)
+  if (hasTokenFile()) {
+    return { authenticated: true };
+  }
+
+  // Slow path: try copilot-api debug --json (may timeout)
+  // Only used if token file doesn't exist
+  const debugInfo = await getCopilotDebugInfo();
+
+  if (debugInfo?.authenticated) {
+    return { authenticated: true };
+  }
+
+  return {
+    authenticated: false,
+  };
+}
+
+/**
+ * Auth flow result with optional device code info.
+ */
+export interface AuthFlowResult {
+  success: boolean;
+  error?: string;
+  /** Device code for user to enter at GitHub */
+  deviceCode?: string;
+  /** URL where user enters the device code */
+  verificationUrl?: string;
+}
+
+/**
+ * Start GitHub OAuth authentication flow.
+ * Captures device code from copilot-api output and returns it.
+ *
+ * @returns Promise that resolves with auth result including device code
+ */
+export function startAuthFlow(): Promise<AuthFlowResult> {
+  const binPath = getCopilotApiBinPath();
+
+  return new Promise((resolve) => {
+    console.log('[i] Starting GitHub authentication for Copilot...');
+    console.log('');
+
+    const proc = spawn(binPath, ['auth'], {
+      stdio: ['ignore', 'pipe', 'pipe'],
+      shell: process.platform === 'win32',
+    });
+
+    let stdout = '';
+    let deviceCode: string | undefined;
+    let verificationUrl: string | undefined;
+
+    proc.stdout.on('data', (data) => {
+      const chunk = data.toString();
+      stdout += chunk;
+
+      // Echo to console for terminal users
+      process.stdout.write(chunk);
+
+      // Parse device code from output like:
+      // "Please enter the code "5653-38A1" in https://github.com/login/device"
+      const codeMatch = stdout.match(/code\s+"([A-Z0-9]{4}-[A-Z0-9]{4})"/i);
+      const urlMatch = stdout.match(/(https:\/\/github\.com\/login\/device)/i);
+
+      if (codeMatch && !deviceCode) {
+        deviceCode = codeMatch[1];
+      }
+      if (urlMatch && !verificationUrl) {
+        verificationUrl = urlMatch[1];
+      }
+    });
+
+    proc.stderr.on('data', (data) => {
+      // Echo stderr to console
+      process.stderr.write(data.toString());
+    });
+
+    proc.on('close', (code) => {
+      if (code === 0) {
+        resolve({ success: true, deviceCode, verificationUrl });
+      } else {
+        resolve({
+          success: false,
+          error: `Authentication failed with exit code ${code}`,
+          deviceCode,
+          verificationUrl,
+        });
+      }
+    });
+
+    proc.on('error', (err) => {
+      resolve({
+        success: false,
+        error: `Failed to start auth: ${err.message}`,
+      });
+    });
+  });
+}
diff --git a/src/copilot/copilot-daemon.ts b/src/copilot/copilot-daemon.ts
new file mode 100644
index 00000000..36d492f7
--- /dev/null
+++ b/src/copilot/copilot-daemon.ts
@@ -0,0 +1,233 @@
+/**
+ * Copilot Daemon Manager
+ *
+ * Manages the copilot-api daemon lifecycle (start/stop/status).
+ * Uses local installation from ~/.ccs/copilot/ (managed by copilot-package-manager).
+ */
+
+import { spawn, ChildProcess } from 'child_process';
+import * as fs from 'fs';
+import * as path from 'path';
+import * as http from 'http';
+import { CopilotDaemonStatus } from './types';
+import { CopilotConfig } from '../config/unified-config-types';
+import { getCopilotDir, getCopilotApiBinPath } from './copilot-package-manager';
+
+const PID_FILE = path.join(getCopilotDir(), 'daemon.pid');
+
+/**
+ * Check if copilot-api daemon is running on the specified port.
+ * Uses 127.0.0.1 instead of localhost for more reliable local connections.
+ */
+export async function isDaemonRunning(port: number): Promise<boolean> {
+  return new Promise((resolve) => {
+    const req = http.request(
+      {
+        hostname: '127.0.0.1',
+        port,
+        path: '/usage',
+        method: 'GET',
+        timeout: 3000,
+      },
+      (res) => {
+        resolve(res.statusCode === 200);
+      }
+    );
+
+    req.on('error', () => {
+      resolve(false);
+    });
+
+    req.on('timeout', () => {
+      req.destroy();
+      resolve(false);
+    });
+
+    req.end();
+  });
+}
+
+/**
+ * Get daemon status.
+ */
+export async function getDaemonStatus(port: number): Promise<CopilotDaemonStatus> {
+  const running = await isDaemonRunning(port);
+  const pid = getPidFromFile();
+
+  return {
+    running,
+    port,
+    pid: running ? (pid ?? undefined) : undefined,
+  };
+}
+
+/**
+ * Read PID from file.
+ */
+function getPidFromFile(): number | null {
+  try {
+    if (fs.existsSync(PID_FILE)) {
+      const content = fs.readFileSync(PID_FILE, 'utf8').trim();
+      const pid = parseInt(content, 10);
+      return isNaN(pid) ? null : pid;
+    }
+  } catch {
+    // Ignore errors
+  }
+  return null;
+}
+
+/**
+ * Write PID to file.
+ */
+function writePidToFile(pid: number): void {
+  try {
+    const dir = path.dirname(PID_FILE);
+    if (!fs.existsSync(dir)) {
+      fs.mkdirSync(dir, { recursive: true, mode: 0o700 });
+    }
+    fs.writeFileSync(PID_FILE, pid.toString(), { mode: 0o600 });
+  } catch {
+    // Ignore errors
+  }
+}
+
+/**
+ * Remove PID file.
+ */
+function removePidFile(): void {
+  try {
+    if (fs.existsSync(PID_FILE)) {
+      fs.unlinkSync(PID_FILE);
+    }
+  } catch {
+    // Ignore errors
+  }
+}
+
+/**
+ * Start the copilot-api daemon.
+ *
+ * @param config Copilot configuration
+ * @returns Promise that resolves when daemon is ready
+ */
+export async function startDaemon(
+  config: CopilotConfig
+): Promise<{ success: boolean; pid?: number; error?: string }> {
+  // Check if already running
+  if (await isDaemonRunning(config.port)) {
+    return { success: true, pid: getPidFromFile() ?? undefined };
+  }
+
+  const binPath = getCopilotApiBinPath();
+  const args = ['start', '--port', config.port.toString()];
+
+  // Add account type
+  if (config.account_type !== 'individual') {
+    args.push('--account-type', config.account_type);
+  }
+
+  // Add rate limiting
+  if (config.rate_limit !== null && config.rate_limit > 0) {
+    args.push('--rate-limit', config.rate_limit.toString());
+    if (config.wait_on_limit) {
+      args.push('--wait');
+    }
+  }
+
+  return new Promise((resolve) => {
+    let proc: ChildProcess;
+
+    try {
+      proc = spawn(binPath, args, {
+        stdio: ['ignore', 'pipe', 'pipe'],
+        detached: true,
+        shell: process.platform === 'win32',
+      });
+
+      // Unref so parent can exit
+      proc.unref();
+
+      if (proc.pid) {
+        writePidToFile(proc.pid);
+      }
+
+      // Wait for daemon to be ready (poll for up to 30 seconds)
+      let attempts = 0;
+      const maxAttempts = 30;
+      const checkInterval = setInterval(async () => {
+        attempts++;
+
+        if (await isDaemonRunning(config.port)) {
+          clearInterval(checkInterval);
+          resolve({ success: true, pid: proc.pid });
+        } else if (attempts >= maxAttempts) {
+          clearInterval(checkInterval);
+          resolve({
+            success: false,
+            error: 'Daemon did not start within 30 seconds',
+          });
+        }
+      }, 1000);
+
+      proc.on('error', (err) => {
+        clearInterval(checkInterval);
+        resolve({
+          success: false,
+          error: `Failed to start daemon: ${err.message}`,
+        });
+      });
+    } catch (err) {
+      resolve({
+        success: false,
+        error: `Failed to spawn daemon: ${(err as Error).message}`,
+      });
+    }
+  });
+}
+
+/**
+ * Stop the copilot-api daemon.
+ */
+export async function stopDaemon(): Promise<{ success: boolean; error?: string }> {
+  const pid = getPidFromFile();
+
+  if (!pid) {
+    // No PID file, try to find by port
+    removePidFile();
+    return { success: true };
+  }
+
+  try {
+    // Send SIGTERM to the process
+    process.kill(pid, 'SIGTERM');
+
+    // Wait for process to exit (up to 5 seconds)
+    let attempts = 0;
+    while (attempts < 10) {
+      await new Promise((resolve) => setTimeout(resolve, 500));
+      try {
+        // Check if process still exists (kill(pid, 0) throws if not)
+        process.kill(pid, 0);
+        attempts++;
+      } catch {
+        // Process no longer exists
+        break;
+      }
+    }
+
+    removePidFile();
+    return { success: true };
+  } catch (err) {
+    const error = err as NodeJS.ErrnoException;
+    if (error.code === 'ESRCH') {
+      // Process doesn't exist
+      removePidFile();
+      return { success: true };
+    }
+    return {
+      success: false,
+      error: `Failed to stop daemon: ${error.message}`,
+    };
+  }
+}
diff --git a/src/copilot/copilot-executor.ts b/src/copilot/copilot-executor.ts
new file mode 100644
index 00000000..012fb385
--- /dev/null
+++ b/src/copilot/copilot-executor.ts
@@ -0,0 +1,156 @@
+/**
+ * Copilot Executor
+ *
+ * Main execution flow for running Claude Code with copilot-api proxy.
+ * Uses local installation from ~/.ccs/copilot/ (managed by copilot-package-manager).
+ */
+
+import { spawn } from 'child_process';
+import { CopilotConfig } from '../config/unified-config-types';
+import { checkAuthStatus, isCopilotApiInstalled } from './copilot-auth';
+import { isDaemonRunning, startDaemon } from './copilot-daemon';
+import { ensureCopilotApi } from './copilot-package-manager';
+import { CopilotStatus } from './types';
+
+/**
+ * Get full copilot status (auth + daemon).
+ */
+export async function getCopilotStatus(config: CopilotConfig): Promise<CopilotStatus> {
+  const [auth, daemonRunning] = await Promise.all([
+    checkAuthStatus(),
+    isDaemonRunning(config.port),
+  ]);
+
+  return {
+    auth,
+    daemon: {
+      running: daemonRunning,
+      port: config.port,
+    },
+  };
+}
+
+/**
+ * Generate environment variables for Claude Code to use copilot-api.
+ * Uses model mapping for opus/sonnet/haiku tiers if configured.
+ */
+export function generateCopilotEnv(config: CopilotConfig): Record<string, string> {
+  // Use mapped models if configured, otherwise fall back to default model
+  const opusModel = config.opus_model || config.model;
+  const sonnetModel = config.sonnet_model || config.model;
+  const haikuModel = config.haiku_model || config.model;
+
+  // Use 127.0.0.1 instead of localhost for more reliable local connections
+  // (bypasses DNS resolution and potential IPv6 issues)
+  return {
+    ANTHROPIC_BASE_URL: `http://127.0.0.1:${config.port}`,
+    ANTHROPIC_AUTH_TOKEN: 'dummy', // copilot-api handles auth internally
+    ANTHROPIC_MODEL: config.model,
+    // Model tier mapping - allows different models for opus/sonnet/haiku
+    ANTHROPIC_DEFAULT_OPUS_MODEL: opusModel,
+    ANTHROPIC_DEFAULT_SONNET_MODEL: sonnetModel,
+    ANTHROPIC_SMALL_FAST_MODEL: haikuModel,
+    ANTHROPIC_DEFAULT_HAIKU_MODEL: haikuModel,
+    // Disable non-essential traffic to avoid rate limiting
+    DISABLE_NON_ESSENTIAL_MODEL_CALLS: '1',
+    CLAUDE_CODE_DISABLE_NONESSENTIAL_TRAFFIC: '1',
+  };
+}
+
+/**
+ * Execute Claude Code with copilot-api proxy.
+ *
+ * @param config Copilot configuration
+ * @param claudeArgs Arguments to pass to Claude CLI
+ * @returns Exit code
+ */
+export async function executeCopilotProfile(
+  config: CopilotConfig,
+  claudeArgs: string[]
+): Promise<number> {
+  // Ensure copilot-api is installed (auto-install if missing, auto-update if outdated)
+  try {
+    await ensureCopilotApi();
+  } catch (error) {
+    console.error('[X] Failed to install copilot-api.');
+    console.error('');
+    console.error(`Error: ${(error as Error).message}`);
+    console.error('');
+    console.error('Try installing manually:');
+    console.error('  npm install -g copilot-api');
+    return 1;
+  }
+
+  // Check if copilot-api is installed (should be after ensureCopilotApi)
+  if (!isCopilotApiInstalled()) {
+    console.error('[X] copilot-api is not installed.');
+    console.error('');
+    console.error('Install with: ccs copilot --install');
+    return 1;
+  }
+
+  // Check authentication
+  const authStatus = await checkAuthStatus();
+  if (!authStatus.authenticated) {
+    console.error('[X] Not authenticated with GitHub.');
+    console.error('');
+    console.error('Run: npx copilot-api auth');
+    console.error('Or:  ccs copilot auth');
+    return 1;
+  }
+
+  // Check if daemon is running or needs to be started
+  let daemonRunning = await isDaemonRunning(config.port);
+
+  if (!daemonRunning) {
+    if (config.auto_start) {
+      console.log('[i] Starting copilot-api daemon...');
+      const result = await startDaemon(config);
+      if (!result.success) {
+        console.error(`[X] Failed to start daemon: ${result.error}`);
+        return 1;
+      }
+      console.log(`[OK] Daemon started on port ${config.port}`);
+      daemonRunning = true;
+    } else {
+      console.error('[X] copilot-api daemon is not running.');
+      console.error('');
+      console.error('Start the daemon manually:');
+      console.error(`  npx copilot-api start --port ${config.port}`);
+      console.error('');
+      console.error('Or enable auto_start in config:');
+      console.error('  ccs config  (then enable auto_start in Copilot section)');
+      return 1;
+    }
+  }
+
+  // Generate environment for Claude
+  const copilotEnv = generateCopilotEnv(config);
+
+  // Merge with current environment
+  const env = {
+    ...process.env,
+    ...copilotEnv,
+  };
+
+  console.log(`[i] Using GitHub Copilot proxy (model: ${config.model})`);
+  console.log('');
+
+  // Spawn Claude CLI
+  return new Promise((resolve) => {
+    const proc = spawn('claude', claudeArgs, {
+      stdio: 'inherit',
+      env,
+      shell: process.platform === 'win32',
+    });
+
+    proc.on('close', (code) => {
+      resolve(code ?? 0);
+    });
+
+    proc.on('error', (err) => {
+      console.error(`[X] Failed to start Claude: ${err.message}`);
+      resolve(1);
+    });
+  });
+}
diff --git a/src/copilot/copilot-models.ts b/src/copilot/copilot-models.ts
new file mode 100644
index 00000000..07aaf195
--- /dev/null
+++ b/src/copilot/copilot-models.ts
@@ -0,0 +1,248 @@
+/**
+ * Copilot Model Catalog
+ *
+ * Manages available models from copilot-api.
+ * Based on GitHub Copilot supported models:
+ * https://docs.github.com/copilot/reference/ai-models/supported-models
+ */
+
+import * as http from 'http';
+import { CopilotModel } from './types';
+
+/**
+ * Default models available through copilot-api.
+ * Used as fallback when API is not reachable.
+ * Source: GitHub Copilot Supported Models (Dec 2025)
+ *
+ * Plan tiers: free, pro, pro+, business, enterprise
+ * Multipliers: 0 = free tier, 0.25-0.33 = cheap, 1 = standard, 3-10 = premium
+ */
+export const DEFAULT_COPILOT_MODELS: CopilotModel[] = [
+  // Anthropic Models - All require paid Copilot subscription
+  {
+    id: 'claude-sonnet-4.5',
+    name: 'Claude Sonnet 4.5',
+    provider: 'anthropic',
+    minPlan: 'pro',
+    multiplier: 1,
+  },
+  {
+    id: 'claude-sonnet-4',
+    name: 'Claude Sonnet 4',
+    provider: 'anthropic',
+    minPlan: 'pro',
+    multiplier: 1,
+  },
+  {
+    id: 'claude-opus-4.5',
+    name: 'Claude Opus 4.5',
+    provider: 'anthropic',
+    minPlan: 'pro',
+    multiplier: 3,
+    preview: true,
+  },
+  {
+    id: 'claude-opus-4.1',
+    name: 'Claude Opus 4.1',
+    provider: 'anthropic',
+    minPlan: 'pro',
+    multiplier: 10,
+  },
+  {
+    id: 'claude-haiku-4.5',
+    name: 'Claude Haiku 4.5',
+    provider: 'anthropic',
+    minPlan: 'pro', // Requires paid Copilot subscription
+    multiplier: 0.33,
+  },
+
+  // OpenAI Models
+  {
+    id: 'gpt-5.2',
+    name: 'GPT-5.2',
+    provider: 'openai',
+    minPlan: 'pro',
+    multiplier: 1,
+    preview: true,
+  },
+  {
+    id: 'gpt-5.1-codex-max',
+    name: 'GPT-5.1 Codex Max',
+    provider: 'openai',
+    minPlan: 'pro',
+    multiplier: 1,
+  },
+  { id: 'gpt-5.1-codex', name: 'GPT-5.1 Codex', provider: 'openai', minPlan: 'pro', multiplier: 1 },
+  {
+    id: 'gpt-5.1-codex-mini',
+    name: 'GPT-5.1 Codex Mini',
+    provider: 'openai',
+    minPlan: 'pro',
+    multiplier: 0.33,
+    preview: true,
+  },
+  { id: 'gpt-5.1', name: 'GPT-5.1', provider: 'openai', minPlan: 'pro', multiplier: 1 },
+  {
+    id: 'gpt-5-codex',
+    name: 'GPT-5 Codex',
+    provider: 'openai',
+    minPlan: 'pro',
+    multiplier: 1,
+    preview: true,
+  },
+  { id: 'gpt-5', name: 'GPT-5', provider: 'openai', minPlan: 'pro', multiplier: 1 },
+  { id: 'gpt-5-mini', name: 'GPT-5 Mini', provider: 'openai', minPlan: 'free', multiplier: 0 },
+  {
+    id: 'gpt-4.1',
+    name: 'GPT-4.1',
+    provider: 'openai',
+    isDefault: true,
+    minPlan: 'free',
+    multiplier: 0,
+  },
+
+  // Google Models
+  {
+    id: 'gemini-3-pro',
+    name: 'Gemini 3 Pro',
+    provider: 'openai',
+    minPlan: 'pro',
+    multiplier: 1,
+    preview: true,
+  },
+  {
+    id: 'gemini-3-flash',
+    name: 'Gemini 3 Flash',
+    provider: 'openai',
+    minPlan: 'pro',
+    multiplier: 0.33,
+    preview: true,
+  },
+  {
+    id: 'gemini-2.5-pro',
+    name: 'Gemini 2.5 Pro',
+    provider: 'openai',
+    minPlan: 'pro',
+    multiplier: 1,
+  },
+
+  // xAI Models
+  {
+    id: 'grok-code-fast-1',
+    name: 'Grok Code Fast 1',
+    provider: 'openai',
+    minPlan: 'pro',
+    multiplier: 0.25,
+  },
+
+  // Fine-tuned Models
+  {
+    id: 'raptor-mini',
+    name: 'Raptor Mini',
+    provider: 'openai',
+    minPlan: 'free',
+    multiplier: 0,
+    preview: true,
+  },
+];
+
+/**
+ * Fetch available models from running copilot-api daemon.
+ *
+ * @param port The port copilot-api is running on
+ * @returns List of available models
+ */
+export async function fetchModelsFromDaemon(port: number): Promise<CopilotModel[]> {
+  return new Promise((resolve) => {
+    const req = http.request(
+      {
+        // Use 127.0.0.1 instead of localhost for more reliable local connections
+        hostname: '127.0.0.1',
+        port,
+        path: '/v1/models',
+        method: 'GET',
+        timeout: 5000,
+      },
+      (res) => {
+        let data = '';
+
+        res.on('data', (chunk) => {
+          data += chunk;
+        });
+
+        res.on('end', () => {
+          try {
+            const response = JSON.parse(data) as { data?: Array<{ id: string }> };
+            if (response.data && Array.isArray(response.data)) {
+              const models: CopilotModel[] = response.data.map((m) => ({
+                id: m.id,
+                name: formatModelName(m.id),
+                provider: detectProvider(m.id),
+                isDefault: m.id === 'gpt-4.1', // Free tier default
+              }));
+              resolve(models.length > 0 ? models : DEFAULT_COPILOT_MODELS);
+            } else {
+              resolve(DEFAULT_COPILOT_MODELS);
+            }
+          } catch {
+            resolve(DEFAULT_COPILOT_MODELS);
+          }
+        });
+      }
+    );
+
+    req.on('error', () => {
+      resolve(DEFAULT_COPILOT_MODELS);
+    });
+
+    req.on('timeout', () => {
+      req.destroy();
+      resolve(DEFAULT_COPILOT_MODELS);
+    });
+
+    req.end();
+  });
+}
+
+/**
+ * Get available models (from daemon or defaults).
+ */
+export async function getAvailableModels(port: number): Promise<CopilotModel[]> {
+  return fetchModelsFromDaemon(port);
+}
+
+/**
+ * Get the default model.
+ * Uses gpt-4.1 as it's available on free tier.
+ */
+export function getDefaultModel(): string {
+  return 'gpt-4.1';
+}
+
+/**
+ * Detect provider from model ID.
+ */
+function detectProvider(modelId: string): 'openai' | 'anthropic' {
+  if (modelId.includes('claude')) return 'anthropic';
+  return 'openai';
+}
+
+/**
+ * Format model ID to human-readable name.
+ * Includes badges for preview and plan tier.
+ */
+function formatModelName(modelId: string): string {
+  // Find model in catalog for metadata
+  const model = DEFAULT_COPILOT_MODELS.find((m) => m.id === modelId);
+  if (model) {
+    let name = model.name;
+    if (model.preview) name += ' (Preview)';
+    return name;
+  }
+
+  // Fallback: convert kebab-case to title case
+  return modelId
+    .split('-')
+    .map((word) => word.charAt(0).toUpperCase() + word.slice(1))
+    .join(' ');
+}
diff --git a/src/copilot/copilot-package-manager.ts b/src/copilot/copilot-package-manager.ts
new file mode 100644
index 00000000..e5c72fba
--- /dev/null
+++ b/src/copilot/copilot-package-manager.ts
@@ -0,0 +1,515 @@
+/**
+ * Copilot Package Manager
+ *
+ * Self-managed npm package installation for copilot-api:
+ * - Installs copilot-api locally to ~/.ccs/copilot/
+ * - Auto-updates to latest version (like CLIProxy binary manager)
+ * - Version caching to avoid hitting npm registry on every run
+ * - Retry logic with exponential backoff
+ *
+ * Pattern: Mirrors CLIProxy BinaryManager but for npm packages
+ */
+
+import * as fs from 'fs';
+import * as path from 'path';
+import { spawn, spawnSync } from 'child_process';
+import { ProgressIndicator } from '../utils/progress-indicator';
+import { ok, info } from '../utils/ui';
+import { getCcsDir } from '../utils/config-manager';
+
+/** Cache duration for version check (1 hour in milliseconds) */
+const VERSION_CACHE_DURATION_MS = 60 * 60 * 1000;
+
+/** Version pin file name */
+const VERSION_PIN_FILE = '.version-pin';
+
+/** Package name to install */
+const COPILOT_API_PACKAGE = 'copilot-api';
+
+/** Version cache file structure */
+interface VersionCache {
+  latestVersion: string;
+  checkedAt: number;
+}
+
+/** Update check result */
+interface UpdateCheckResult {
+  hasUpdate: boolean;
+  currentVersion: string;
+  latestVersion: string;
+  fromCache: boolean;
+}
+
+/** Install result */
+interface InstallResult {
+  success: boolean;
+  version?: string;
+  error?: string;
+}
+
+/**
+ * Get copilot base directory
+ * All copilot-related files are stored under ~/.ccs/copilot/
+ */
+export function getCopilotDir(): string {
+  return path.join(getCcsDir(), 'copilot');
+}
+
+/**
+ * Get path to copilot-api binary
+ */
+export function getCopilotApiBinPath(): string {
+  const binName = process.platform === 'win32' ? 'copilot-api.cmd' : 'copilot-api';
+  return path.join(getCopilotDir(), 'node_modules', '.bin', binName);
+}
+
+/**
+ * Get path to package.json
+ */
+function getPackageJsonPath(): string {
+  return path.join(getCopilotDir(), 'package.json');
+}
+
+/**
+ * Get path to version file
+ */
+function getVersionFilePath(): string {
+  return path.join(getCopilotDir(), '.version');
+}
+
+/**
+ * Get path to version cache file
+ */
+function getVersionCachePath(): string {
+  return path.join(getCopilotDir(), '.version-cache.json');
+}
+
+/**
+ * Get path to version pin file
+ */
+export function getVersionPinPath(): string {
+  return path.join(getCopilotDir(), VERSION_PIN_FILE);
+}
+
+/**
+ * Check if copilot-api is installed locally
+ */
+export function isCopilotApiInstalled(): boolean {
+  return fs.existsSync(getCopilotApiBinPath());
+}
+
+/**
+ * Get installed version from .version file
+ */
+export function getInstalledVersion(): string | null {
+  const versionFile = getVersionFilePath();
+  if (fs.existsSync(versionFile)) {
+    try {
+      return fs.readFileSync(versionFile, 'utf8').trim();
+    } catch {
+      return null;
+    }
+  }
+  return null;
+}
+
+/**
+ * Save installed version to file
+ */
+function saveInstalledVersion(version: string): void {
+  const versionFile = getVersionFilePath();
+  try {
+    fs.writeFileSync(versionFile, version, 'utf8');
+  } catch {
+    // Silent fail - not critical
+  }
+}
+
+/**
+ * Get cached latest version if still valid
+ */
+function getCachedLatestVersion(): string | null {
+  const cachePath = getVersionCachePath();
+  if (!fs.existsSync(cachePath)) {
+    return null;
+  }
+
+  try {
+    const content = fs.readFileSync(cachePath, 'utf8');
+    const cache: VersionCache = JSON.parse(content);
+
+    // Check if cache is still valid
+    if (Date.now() - cache.checkedAt < VERSION_CACHE_DURATION_MS) {
+      return cache.latestVersion;
+    }
+
+    // Cache expired
+    return null;
+  } catch {
+    return null;
+  }
+}
+
+/**
+ * Cache latest version for future checks
+ */
+function cacheLatestVersion(version: string): void {
+  const cachePath = getVersionCachePath();
+  const cache: VersionCache = {
+    latestVersion: version,
+    checkedAt: Date.now(),
+  };
+
+  try {
+    fs.mkdirSync(path.dirname(cachePath), { recursive: true });
+    fs.writeFileSync(cachePath, JSON.stringify(cache), 'utf8');
+  } catch {
+    // Silent fail - caching is optional
+  }
+}
+
+/**
+ * Fetch latest version from npm registry
+ */
+async function fetchLatestVersion(): Promise<string> {
+  return new Promise((resolve, reject) => {
+    const result = spawnSync('npm', ['view', COPILOT_API_PACKAGE, 'version'], {
+      encoding: 'utf8',
+      timeout: 15000,
+      shell: process.platform === 'win32',
+    });
+
+    if (result.status === 0 && result.stdout) {
+      resolve(result.stdout.trim());
+    } else {
+      reject(new Error(result.stderr || 'Failed to fetch version from npm'));
+    }
+  });
+}
+
+/**
+ * Compare semver versions (true if latest > current)
+ */
+function isNewerVersion(latest: string, current: string): boolean {
+  const latestParts = latest.split('.').map((p) => parseInt(p, 10) || 0);
+  const currentParts = current.split('.').map((p) => parseInt(p, 10) || 0);
+
+  // Pad arrays to same length
+  while (latestParts.length < 3) latestParts.push(0);
+  while (currentParts.length < 3) currentParts.push(0);
+
+  for (let i = 0; i < 3; i++) {
+    if (latestParts[i] > currentParts[i]) return true;
+    if (latestParts[i] < currentParts[i]) return false;
+  }
+
+  return false; // Equal versions
+}
+
+/**
+ * Get pinned version if one exists
+ */
+export function getPinnedVersion(): string | null {
+  const pinPath = getVersionPinPath();
+  if (!fs.existsSync(pinPath)) {
+    return null;
+  }
+  try {
+    return fs.readFileSync(pinPath, 'utf8').trim();
+  } catch {
+    return null;
+  }
+}
+
+/**
+ * Save pinned version
+ */
+export function savePinnedVersion(version: string): void {
+  const pinPath = getVersionPinPath();
+  try {
+    fs.mkdirSync(path.dirname(pinPath), { recursive: true });
+    fs.writeFileSync(pinPath, version, 'utf8');
+  } catch {
+    // Silent fail
+  }
+}
+
+/**
+ * Clear pinned version
+ */
+export function clearPinnedVersion(): void {
+  const pinPath = getVersionPinPath();
+  if (fs.existsSync(pinPath)) {
+    try {
+      fs.unlinkSync(pinPath);
+    } catch {
+      // Silent fail
+    }
+  }
+}
+
+/**
+ * Check for updates
+ */
+export async function checkForUpdates(): Promise<UpdateCheckResult> {
+  const currentVersion = getInstalledVersion() || '0.0.0';
+
+  // Try cache first
+  const cachedVersion = getCachedLatestVersion();
+  if (cachedVersion) {
+    return {
+      hasUpdate: isNewerVersion(cachedVersion, currentVersion),
+      currentVersion,
+      latestVersion: cachedVersion,
+      fromCache: true,
+    };
+  }
+
+  // Fetch from npm registry
+  try {
+    const latestVersion = await fetchLatestVersion();
+    cacheLatestVersion(latestVersion);
+
+    return {
+      hasUpdate: isNewerVersion(latestVersion, currentVersion),
+      currentVersion,
+      latestVersion,
+      fromCache: false,
+    };
+  } catch {
+    // Return no update if fetch fails
+    return {
+      hasUpdate: false,
+      currentVersion,
+      latestVersion: currentVersion,
+      fromCache: false,
+    };
+  }
+}
+
+/**
+ * Run npm install in copilot directory
+ */
+async function runNpmInstall(version?: string): Promise<InstallResult> {
+  const copilotDir = getCopilotDir();
+
+  // Ensure directory exists
+  fs.mkdirSync(copilotDir, { recursive: true });
+
+  // Create package.json with versioned or latest dependency
+  const packageJson = {
+    name: 'ccs-copilot-local',
+    private: true,
+    dependencies: {
+      [COPILOT_API_PACKAGE]: version || 'latest',
+    },
+  };
+
+  fs.writeFileSync(getPackageJsonPath(), JSON.stringify(packageJson, null, 2), 'utf8');
+
+  return new Promise((resolve) => {
+    const proc = spawn('npm', ['install', '--prefer-offline', '--no-audit', '--no-fund'], {
+      cwd: copilotDir,
+      stdio: ['ignore', 'pipe', 'pipe'],
+      shell: process.platform === 'win32',
+    });
+
+    let stderr = '';
+
+    proc.stderr?.on('data', (data) => {
+      stderr += data.toString();
+    });
+
+    proc.on('close', (code) => {
+      if (code === 0) {
+        // Get installed version from package-lock.json or package.json
+        try {
+          const lockPath = path.join(copilotDir, 'package-lock.json');
+          if (fs.existsSync(lockPath)) {
+            const lock = JSON.parse(fs.readFileSync(lockPath, 'utf8'));
+            const installedVersion =
+              lock.packages?.['node_modules/copilot-api']?.version ||
+              lock.dependencies?.[COPILOT_API_PACKAGE]?.version;
+            if (installedVersion) {
+              saveInstalledVersion(installedVersion);
+              resolve({ success: true, version: installedVersion });
+              return;
+            }
+          }
+        } catch {
+          // Fallback
+        }
+        resolve({ success: true, version: version || 'latest' });
+      } else {
+        resolve({ success: false, error: stderr || `npm install failed with code ${code}` });
+      }
+    });
+
+    proc.on('error', (err) => {
+      resolve({ success: false, error: err.message });
+    });
+  });
+}
+
+/**
+ * Ensure copilot-api is available (install if missing, update if outdated)
+ * @returns Path to copilot-api binary
+ */
+export async function ensureCopilotApi(verbose = false): Promise<string> {
+  const binPath = getCopilotApiBinPath();
+  const pinnedVersion = getPinnedVersion();
+
+  // Check if already installed
+  if (isCopilotApiInstalled()) {
+    if (verbose) {
+      console.error(`[copilot] Binary exists: ${binPath}`);
+    }
+
+    // Skip auto-update if version is pinned
+    if (pinnedVersion) {
+      if (verbose) {
+        console.error(`[copilot] Pinned version mode: skipping auto-update`);
+      }
+      return binPath;
+    }
+
+    // Check for updates (non-blocking for UX)
+    try {
+      const updateResult = await checkForUpdates();
+      if (updateResult.hasUpdate) {
+        console.log(
+          info(
+            `copilot-api update available: v${updateResult.currentVersion} -> v${updateResult.latestVersion}`
+          )
+        );
+        console.log(info('Updating copilot-api...'));
+
+        const spinner = new ProgressIndicator('Updating copilot-api');
+        spinner.start();
+
+        const result = await runNpmInstall(updateResult.latestVersion);
+        if (result.success) {
+          spinner.succeed('copilot-api updated');
+          console.log(ok(`copilot-api v${result.version} installed successfully`));
+        } else {
+          spinner.fail('Update failed (non-blocking)');
+          if (verbose) {
+            console.error(`[copilot] Update failed: ${result.error}`);
+          }
+        }
+      }
+    } catch (error) {
+      // Silent fail - don't block startup if update check fails
+      if (verbose) {
+        console.error(`[copilot] Update check failed: ${(error as Error).message}`);
+      }
+    }
+
+    return binPath;
+  }
+
+  // Not installed - install now
+  console.log(info('copilot-api not found, installing...'));
+
+  const spinner = new ProgressIndicator('Installing copilot-api');
+  spinner.start();
+
+  try {
+    // Get target version
+    let targetVersion: string | undefined;
+    if (pinnedVersion) {
+      targetVersion = pinnedVersion;
+      if (verbose) {
+        console.error(`[copilot] Using pinned version: ${pinnedVersion}`);
+      }
+    } else {
+      // Fetch latest version
+      try {
+        targetVersion = await fetchLatestVersion();
+        cacheLatestVersion(targetVersion);
+      } catch {
+        // Use 'latest' if fetch fails
+        targetVersion = undefined;
+      }
+    }
+
+    const result = await runNpmInstall(targetVersion);
+
+    if (result.success) {
+      spinner.succeed('copilot-api installed');
+      console.log(ok(`copilot-api v${result.version} installed successfully`));
+      return binPath;
+    } else {
+      spinner.fail('Installation failed');
+      throw new Error(result.error || 'npm install failed');
+    }
+  } catch (error) {
+    spinner.fail('Installation failed');
+    throw error;
+  }
+}
+
+/**
+ * Install a specific version of copilot-api
+ */
+export async function installCopilotApiVersion(version: string, _verbose = false): Promise<void> {
+  const spinner = new ProgressIndicator(`Installing copilot-api v${version}`);
+  spinner.start();
+
+  try {
+    const result = await runNpmInstall(version);
+
+    if (result.success) {
+      spinner.succeed('copilot-api installed');
+      console.log(ok(`copilot-api v${result.version} installed successfully`));
+    } else {
+      spinner.fail('Installation failed');
+      throw new Error(result.error || 'npm install failed');
+    }
+  } catch (error) {
+    spinner.fail('Installation failed');
+    throw error;
+  }
+}
+
+/**
+ * Uninstall copilot-api (remove ~/.ccs/copilot directory)
+ */
+export function uninstallCopilotApi(): void {
+  const copilotDir = getCopilotDir();
+  if (fs.existsSync(copilotDir)) {
+    fs.rmSync(copilotDir, { recursive: true, force: true });
+  }
+}
+
+/**
+ * Get copilot-api info
+ */
+export function getCopilotApiInfo(): {
+  installed: boolean;
+  version: string | null;
+  path: string;
+  pinnedVersion: string | null;
+} {
+  return {
+    installed: isCopilotApiInstalled(),
+    version: getInstalledVersion(),
+    path: getCopilotApiBinPath(),
+    pinnedVersion: getPinnedVersion(),
+  };
+}
+
+export default {
+  getCopilotDir,
+  getCopilotApiBinPath,
+  isCopilotApiInstalled,
+  getInstalledVersion,
+  getPinnedVersion,
+  savePinnedVersion,
+  clearPinnedVersion,
+  checkForUpdates,
+  ensureCopilotApi,
+  installCopilotApiVersion,
+  uninstallCopilotApi,
+  getCopilotApiInfo,
+};
diff --git a/src/copilot/index.ts b/src/copilot/index.ts
new file mode 100644
index 00000000..b1f9d184
--- /dev/null
+++ b/src/copilot/index.ts
@@ -0,0 +1,48 @@
+/**
+ * Copilot Module Index
+ *
+ * Central exports for GitHub Copilot integration via copilot-api.
+ */
+
+// Types
+export * from './types';
+
+// Package Manager (self-managed installation)
+export {
+  getCopilotDir,
+  getCopilotApiBinPath,
+  isCopilotApiInstalled,
+  getInstalledVersion,
+  getPinnedVersion,
+  savePinnedVersion,
+  clearPinnedVersion,
+  checkForUpdates,
+  ensureCopilotApi,
+  installCopilotApiVersion,
+  uninstallCopilotApi,
+  getCopilotApiInfo,
+} from './copilot-package-manager';
+
+// Auth
+export {
+  checkAuthStatus,
+  startAuthFlow,
+  getCopilotDebugInfo,
+  hasTokenFile,
+  getTokenPath,
+} from './copilot-auth';
+export type { AuthFlowResult } from './copilot-auth';
+
+// Daemon
+export { isDaemonRunning, getDaemonStatus, startDaemon, stopDaemon } from './copilot-daemon';
+
+// Models
+export {
+  DEFAULT_COPILOT_MODELS,
+  fetchModelsFromDaemon,
+  getAvailableModels,
+  getDefaultModel,
+} from './copilot-models';
+
+// Executor
+export { getCopilotStatus, generateCopilotEnv, executeCopilotProfile } from './copilot-executor';
diff --git a/src/copilot/types.ts b/src/copilot/types.ts
new file mode 100644
index 00000000..e0429a1d
--- /dev/null
+++ b/src/copilot/types.ts
@@ -0,0 +1,70 @@
+/**
+ * Copilot API Types
+ *
+ * Type definitions for GitHub Copilot proxy integration.
+ */
+
+/**
+ * Copilot authentication status.
+ */
+export interface CopilotAuthStatus {
+  authenticated: boolean;
+  /** GitHub username if authenticated */
+  username?: string;
+  /** Error message if auth check failed */
+  error?: string;
+}
+
+/**
+ * Copilot daemon status.
+ */
+export interface CopilotDaemonStatus {
+  running: boolean;
+  port: number;
+  /** Process ID if running */
+  pid?: number;
+  /** Version if available */
+  version?: string;
+}
+
+/**
+ * Combined copilot status.
+ */
+export interface CopilotStatus {
+  auth: CopilotAuthStatus;
+  daemon: CopilotDaemonStatus;
+}
+
+/**
+ * Copilot plan tier for model availability.
+ * Based on GitHub Copilot plans.
+ */
+export type CopilotPlanTier = 'free' | 'pro' | 'pro+' | 'business' | 'enterprise';
+
+/**
+ * Copilot model information.
+ */
+export interface CopilotModel {
+  id: string;
+  name: string;
+  /** Provider: openai or anthropic */
+  provider: 'openai' | 'anthropic';
+  /** Whether this is the default model */
+  isDefault?: boolean;
+  /** Minimum plan tier required (free = available to all) */
+  minPlan?: CopilotPlanTier;
+  /** Premium request multiplier (0 = free, higher = more expensive) */
+  multiplier?: number;
+  /** Whether this model is in preview */
+  preview?: boolean;
+}
+
+/**
+ * Copilot debug info from `copilot-api debug --json`.
+ */
+export interface CopilotDebugInfo {
+  version?: string;
+  runtime?: string;
+  authenticated?: boolean;
+  tokenPath?: string;
+}
diff --git a/src/web-server/routes.ts b/src/web-server/routes.ts
index 74066c0c..e689ed5d 100644
--- a/src/web-server/routes.ts
+++ b/src/web-server/routes.ts
@@ -1688,3 +1688,315 @@ apiRoutes.get('/websearch/status', (_req: Request, res: Response): void => {
     res.status(500).json({ error: (error as Error).message });
   }
 });
+
+// ============================================================================
+// COPILOT API ROUTES
+// GitHub Copilot integration via copilot-api proxy
+// ============================================================================
+
+import {
+  checkAuthStatus as checkCopilotAuth,
+  startAuthFlow as startCopilotAuth,
+  getCopilotStatus,
+  startDaemon as startCopilotDaemon,
+  stopDaemon as stopCopilotDaemon,
+  getAvailableModels as getCopilotModels,
+  isCopilotApiInstalled,
+  ensureCopilotApi,
+  installCopilotApiVersion,
+  getCopilotApiInfo,
+  getInstalledVersion as getCopilotInstalledVersion,
+} from '../copilot';
+import { DEFAULT_COPILOT_CONFIG } from '../config/unified-config-types';
+import { loadOrCreateUnifiedConfig } from '../config/unified-config-loader';
+
+/**
+ * GET /api/copilot/status - Get Copilot status (auth + daemon + install info)
+ */
+apiRoutes.get('/copilot/status', async (_req: Request, res: Response): Promise<void> => {
+  try {
+    const config = loadOrCreateUnifiedConfig();
+    const copilotConfig = config.copilot ?? DEFAULT_COPILOT_CONFIG;
+    const status = await getCopilotStatus(copilotConfig);
+    const installed = isCopilotApiInstalled();
+    const version = getCopilotInstalledVersion();
+
+    res.json({
+      enabled: copilotConfig.enabled,
+      installed,
+      version,
+      authenticated: status.auth.authenticated,
+      daemon_running: status.daemon.running,
+      port: copilotConfig.port,
+      model: copilotConfig.model,
+      account_type: copilotConfig.account_type,
+      auto_start: copilotConfig.auto_start,
+      rate_limit: copilotConfig.rate_limit,
+      wait_on_limit: copilotConfig.wait_on_limit,
+    });
+  } catch (error) {
+    res.status(500).json({ error: (error as Error).message });
+  }
+});
+
+/**
+ * GET /api/copilot/config - Get Copilot configuration
+ */
+apiRoutes.get('/copilot/config', (_req: Request, res: Response): void => {
+  try {
+    const config = loadOrCreateUnifiedConfig();
+    const copilotConfig = config.copilot ?? DEFAULT_COPILOT_CONFIG;
+    res.json(copilotConfig);
+  } catch (error) {
+    res.status(500).json({ error: (error as Error).message });
+  }
+});
+
+/**
+ * PUT /api/copilot/config - Update Copilot configuration
+ */
+apiRoutes.put('/copilot/config', (req: Request, res: Response): void => {
+  try {
+    const updates = req.body;
+    const config = loadOrCreateUnifiedConfig();
+
+    // Merge updates with existing config
+    config.copilot = {
+      enabled: updates.enabled ?? config.copilot?.enabled ?? DEFAULT_COPILOT_CONFIG.enabled,
+      auto_start:
+        updates.auto_start ?? config.copilot?.auto_start ?? DEFAULT_COPILOT_CONFIG.auto_start,
+      port: updates.port ?? config.copilot?.port ?? DEFAULT_COPILOT_CONFIG.port,
+      account_type:
+        updates.account_type ?? config.copilot?.account_type ?? DEFAULT_COPILOT_CONFIG.account_type,
+      rate_limit:
+        updates.rate_limit !== undefined
+          ? updates.rate_limit
+          : (config.copilot?.rate_limit ?? DEFAULT_COPILOT_CONFIG.rate_limit),
+      wait_on_limit:
+        updates.wait_on_limit ??
+        config.copilot?.wait_on_limit ??
+        DEFAULT_COPILOT_CONFIG.wait_on_limit,
+      model: updates.model ?? config.copilot?.model ?? DEFAULT_COPILOT_CONFIG.model,
+      // Model mapping for opus/sonnet/haiku tiers
+      opus_model:
+        updates.opus_model !== undefined ? updates.opus_model : config.copilot?.opus_model,
+      sonnet_model:
+        updates.sonnet_model !== undefined ? updates.sonnet_model : config.copilot?.sonnet_model,
+      haiku_model:
+        updates.haiku_model !== undefined ? updates.haiku_model : config.copilot?.haiku_model,
+    };
+
+    saveUnifiedConfig(config);
+    res.json({ success: true, copilot: config.copilot });
+  } catch (error) {
+    res.status(500).json({ error: (error as Error).message });
+  }
+});
+
+/**
+ * POST /api/copilot/auth/start - Start GitHub OAuth flow
+ * Note: This is a long-running operation that opens browser
+ */
+apiRoutes.post('/copilot/auth/start', async (_req: Request, res: Response): Promise<void> => {
+  try {
+    const result = await startCopilotAuth();
+    res.json(result);
+  } catch (error) {
+    res.status(500).json({ error: (error as Error).message });
+  }
+});
+
+/**
+ * GET /api/copilot/auth/status - Get auth status only
+ */
+apiRoutes.get('/copilot/auth/status', async (_req: Request, res: Response): Promise<void> => {
+  try {
+    const status = await checkCopilotAuth();
+    res.json(status);
+  } catch (error) {
+    res.status(500).json({ error: (error as Error).message });
+  }
+});
+
+/**
+ * GET /api/copilot/models - Get available models
+ */
+apiRoutes.get('/copilot/models', async (_req: Request, res: Response): Promise<void> => {
+  try {
+    const config = loadOrCreateUnifiedConfig();
+    const port = config.copilot?.port ?? DEFAULT_COPILOT_CONFIG.port;
+    const currentModel = config.copilot?.model ?? DEFAULT_COPILOT_CONFIG.model;
+    const models = await getCopilotModels(port);
+
+    // Mark current model
+    const modelsWithCurrent = models.map((m) => ({
+      ...m,
+      isCurrent: m.id === currentModel,
+    }));
+
+    res.json({ models: modelsWithCurrent, current: currentModel });
+  } catch (error) {
+    res.status(500).json({ error: (error as Error).message });
+  }
+});
+
+/**
+ * POST /api/copilot/daemon/start - Start copilot-api daemon
+ */
+apiRoutes.post('/copilot/daemon/start', async (_req: Request, res: Response): Promise<void> => {
+  try {
+    const config = loadOrCreateUnifiedConfig();
+    const copilotConfig = config.copilot ?? DEFAULT_COPILOT_CONFIG;
+    const result = await startCopilotDaemon(copilotConfig);
+    res.json(result);
+  } catch (error) {
+    res.status(500).json({ error: (error as Error).message });
+  }
+});
+
+/**
+ * POST /api/copilot/daemon/stop - Stop copilot-api daemon
+ */
+apiRoutes.post('/copilot/daemon/stop', async (_req: Request, res: Response): Promise<void> => {
+  try {
+    const result = await stopCopilotDaemon();
+    res.json(result);
+  } catch (error) {
+    res.status(500).json({ error: (error as Error).message });
+  }
+});
+
+/**
+ * POST /api/copilot/install - Install copilot-api
+ * Auto-installs latest version or specific version if provided
+ */
+apiRoutes.post('/copilot/install', async (req: Request, res: Response): Promise<void> => {
+  try {
+    const { version } = req.body || {};
+
+    if (version) {
+      // Install specific version
+      await installCopilotApiVersion(version);
+    } else {
+      // Install latest version
+      await ensureCopilotApi();
+    }
+
+    const info = getCopilotApiInfo();
+    res.json({
+      success: true,
+      installed: info.installed,
+      version: info.version,
+      path: info.path,
+    });
+  } catch (error) {
+    res.status(500).json({ error: (error as Error).message });
+  }
+});
+
+/**
+ * GET /api/copilot/info - Get copilot-api installation info
+ */
+apiRoutes.get('/copilot/info', (_req: Request, res: Response): void => {
+  try {
+    const info = getCopilotApiInfo();
+    res.json(info);
+  } catch (error) {
+    res.status(500).json({ error: (error as Error).message });
+  }
+});
+
+/**
+ * GET /api/copilot/settings/raw - Get raw copilot.settings.json
+ * Returns the raw JSON content for editing in the code editor
+ */
+apiRoutes.get('/copilot/settings/raw', (_req: Request, res: Response): void => {
+  try {
+    const settingsPath = path.join(getCcsDir(), 'copilot.settings.json');
+    const config = loadOrCreateUnifiedConfig();
+    const copilotConfig = config.copilot ?? DEFAULT_COPILOT_CONFIG;
+
+    // Default model for all tiers
+    const defaultModel = copilotConfig.model;
+
+    // If file doesn't exist, return default structure with all model mappings
+    if (!fs.existsSync(settingsPath)) {
+      // Create settings structure matching CLIProxy pattern - always include all model mappings
+      // Use 127.0.0.1 instead of localhost for more reliable local connections
+      const defaultSettings = {
+        env: {
+          ANTHROPIC_BASE_URL: `http://127.0.0.1:${copilotConfig.port}`,
+          ANTHROPIC_AUTH_TOKEN: 'copilot-managed',
+          ANTHROPIC_MODEL: defaultModel,
+          ANTHROPIC_DEFAULT_OPUS_MODEL: copilotConfig.opus_model || defaultModel,
+          ANTHROPIC_DEFAULT_SONNET_MODEL: copilotConfig.sonnet_model || defaultModel,
+          ANTHROPIC_DEFAULT_HAIKU_MODEL: copilotConfig.haiku_model || defaultModel,
+        },
+      };
+
+      res.json({
+        settings: defaultSettings,
+        mtime: Date.now(),
+        path: `~/.ccs/copilot.settings.json`,
+        exists: false,
+      });
+      return;
+    }
+
+    const content = fs.readFileSync(settingsPath, 'utf-8');
+    const settings = JSON.parse(content);
+    const stat = fs.statSync(settingsPath);
+
+    res.json({
+      settings,
+      mtime: stat.mtimeMs,
+      path: `~/.ccs/copilot.settings.json`,
+      exists: true,
+    });
+  } catch (error) {
+    res.status(500).json({ error: (error as Error).message });
+  }
+});
+
+/**
+ * PUT /api/copilot/settings/raw - Save raw copilot.settings.json
+ * Saves the raw JSON content from the code editor
+ */
+apiRoutes.put('/copilot/settings/raw', (req: Request, res: Response): void => {
+  try {
+    const { settings, expectedMtime } = req.body;
+    const settingsPath = path.join(getCcsDir(), 'copilot.settings.json');
+
+    // Check for conflict if file exists and expectedMtime provided
+    if (fs.existsSync(settingsPath) && expectedMtime) {
+      const stat = fs.statSync(settingsPath);
+      if (Math.abs(stat.mtimeMs - expectedMtime) > 1000) {
+        res.status(409).json({ error: 'File modified externally', mtime: stat.mtimeMs });
+        return;
+      }
+    }
+
+    // Write settings file atomically
+    const tempPath = settingsPath + '.tmp';
+    fs.writeFileSync(tempPath, JSON.stringify(settings, null, 2) + '\n');
+    fs.renameSync(tempPath, settingsPath);
+
+    // Also sync model mappings back to unified config
+    const config = loadOrCreateUnifiedConfig();
+    const env = settings.env || {};
+
+    config.copilot = {
+      ...(config.copilot ?? DEFAULT_COPILOT_CONFIG),
+      model: env.ANTHROPIC_MODEL || config.copilot?.model || DEFAULT_COPILOT_CONFIG.model,
+      opus_model: env.ANTHROPIC_DEFAULT_OPUS_MODEL || undefined,
+      sonnet_model: env.ANTHROPIC_DEFAULT_SONNET_MODEL || undefined,
+      haiku_model: env.ANTHROPIC_DEFAULT_HAIKU_MODEL || undefined,
+    };
+    saveUnifiedConfig(config);
+
+    const stat = fs.statSync(settingsPath);
+    res.json({ success: true, mtime: stat.mtimeMs });
+  } catch (error) {
+    res.status(500).json({ error: (error as Error).message });
+  }
+});
diff --git a/ui/src/App.tsx b/ui/src/App.tsx
index dc10a280..2604f341 100644
--- a/ui/src/App.tsx
+++ b/ui/src/App.tsx
@@ -21,6 +21,7 @@ const CliproxyPage = lazy(() =>
 const CliproxyControlPanelPage = lazy(() =>
   import('@/pages/cliproxy-control-panel').then((m) => ({ default: m.CliproxyControlPanelPage }))
 );
+const CopilotPage = lazy(() => import('@/pages/copilot').then((m) => ({ default: m.CopilotPage })));
 const AccountsPage = lazy(() =>
   import('@/pages/accounts').then((m) => ({ default: m.AccountsPage }))
 );
@@ -43,6 +44,7 @@ export default function App() {
                 <Route path="/api" element={<ApiPage />} />
                 <Route path="/cliproxy" element={<CliproxyPage />} />
                 <Route path="/cliproxy/control-panel" element={<CliproxyControlPanelPage />} />
+                <Route path="/copilot" element={<CopilotPage />} />
                 <Route path="/accounts" element={<AccountsPage />} />
                 <Route path="/settings" element={<SettingsPage />} />
                 <Route path="/health" element={<HealthPage />} />
diff --git a/ui/src/components/app-sidebar.tsx b/ui/src/components/app-sidebar.tsx
index ec12c94c..ccf4ced7 100644
--- a/ui/src/components/app-sidebar.tsx
+++ b/ui/src/components/app-sidebar.tsx
@@ -10,6 +10,7 @@ import {
   ChevronRight,
   BarChart3,
   Gauge,
+  Github,
 } from 'lucide-react';
 import {
   Sidebar,
@@ -54,6 +55,7 @@ const navGroups = [
           { path: '/cliproxy/control-panel', icon: Gauge, label: 'Control Panel' },
         ],
       },
+      { path: '/copilot', icon: Github, label: 'GitHub Copilot' },
       {
         path: '/accounts',
         icon: Users,
diff --git a/ui/src/components/copilot/copilot-config-form.tsx b/ui/src/components/copilot/copilot-config-form.tsx
new file mode 100644
index 00000000..80cce9db
--- /dev/null
+++ b/ui/src/components/copilot/copilot-config-form.tsx
@@ -0,0 +1,839 @@
+/**
+ * Copilot Config Form
+ *
+ * Form for configuring GitHub Copilot integration settings.
+ * Split-view layout matching CLIProxy provider editor:
+ * - Left (50%): Friendly UI with model mapping selectors
+ * - Right (50%): Raw JSON editor for copilot.settings.json
+ */
+
+import { useState, useMemo, useCallback, lazy, Suspense } from 'react';
+import { Button } from '@/components/ui/button';
+import { Input } from '@/components/ui/input';
+import { Label } from '@/components/ui/label';
+import { Switch } from '@/components/ui/switch';
+import { Separator } from '@/components/ui/separator';
+import { Skeleton } from '@/components/ui/skeleton';
+import { ScrollArea } from '@/components/ui/scroll-area';
+import { Tabs, TabsList, TabsTrigger, TabsContent } from '@/components/ui/tabs';
+import { CopyButton } from '@/components/ui/copy-button';
+import { Badge } from '@/components/ui/badge';
+import {
+  Select,
+  SelectContent,
+  SelectItem,
+  SelectTrigger,
+  SelectValue,
+  SelectGroup,
+  SelectLabel,
+} from '@/components/ui/select';
+import { useCopilot, type CopilotModel, type CopilotPlanTier } from '@/hooks/use-copilot';
+import { Loader2, Save, Code2, X, Info, RefreshCw, Sparkles, Zap, Check } from 'lucide-react';
+import { toast } from 'sonner';
+import { ConfirmDialog } from '@/components/confirm-dialog';
+
+// Lazy load CodeEditor
+const CodeEditor = lazy(() =>
+  import('@/components/code-editor').then((m) => ({ default: m.CodeEditor }))
+);
+
+// Model presets for quick configuration
+// Grouped by tier: Free (available to all) and Paid (requires Pro+)
+// Note: ALL Claude models require paid Copilot subscription
+const FREE_PRESETS = [
+  {
+    name: 'GPT-4.1 (Free)',
+    description: 'Free tier - no premium usage',
+    default: 'gpt-4.1',
+    opus: 'gpt-4.1',
+    sonnet: 'gpt-4.1',
+    haiku: 'gpt-4.1',
+  },
+  {
+    name: 'GPT-5 Mini (Free)',
+    description: 'Free tier - lightweight model',
+    default: 'gpt-5-mini',
+    opus: 'gpt-5-mini',
+    sonnet: 'gpt-5-mini',
+    haiku: 'gpt-5-mini',
+  },
+  {
+    name: 'Raptor Mini (Free)',
+    description: 'Free tier - fine-tuned for coding',
+    default: 'raptor-mini',
+    opus: 'raptor-mini',
+    sonnet: 'raptor-mini',
+    haiku: 'raptor-mini',
+  },
+];
+
+const PAID_PRESETS = [
+  {
+    name: 'Claude Opus 4.5',
+    description: 'Pro+ (3x) - Most capable reasoning',
+    default: 'claude-opus-4.5',
+    opus: 'claude-opus-4.5',
+    sonnet: 'claude-sonnet-4.5',
+    haiku: 'claude-haiku-4.5',
+  },
+  {
+    name: 'Claude Sonnet 4.5',
+    description: 'Pro+ (1x) - Balanced performance',
+    default: 'claude-sonnet-4.5',
+    opus: 'claude-opus-4.5',
+    sonnet: 'claude-sonnet-4.5',
+    haiku: 'claude-haiku-4.5',
+  },
+  {
+    name: 'GPT-5.2',
+    description: 'Pro+ (1x) - Latest OpenAI (Preview)',
+    default: 'gpt-5.2',
+    opus: 'gpt-5.2',
+    sonnet: 'gpt-5.1',
+    haiku: 'gpt-5-mini',
+  },
+  {
+    name: 'GPT-5.1 Codex Max',
+    description: 'Pro+ (1x) - Best for coding',
+    default: 'gpt-5.1-codex-max',
+    opus: 'gpt-5.1-codex-max',
+    sonnet: 'gpt-5.1-codex',
+    haiku: 'gpt-5.1-codex-mini',
+  },
+  {
+    name: 'Gemini 2.5 Pro',
+    description: 'Pro+ (1x) - Google latest',
+    default: 'gemini-2.5-pro',
+    opus: 'gemini-2.5-pro',
+    sonnet: 'gemini-2.5-pro',
+    haiku: 'gemini-3-flash',
+  },
+];
+
+interface FlexibleModelSelectorProps {
+  label: string;
+  description?: string;
+  value: string | undefined;
+  onChange: (model: string) => void;
+  models: CopilotModel[];
+  disabled?: boolean;
+}
+
+/** Get badge style for plan tier */
+function getPlanBadgeStyle(plan?: CopilotPlanTier): string {
+  switch (plan) {
+    case 'free':
+      return 'bg-green-100 text-green-700 border-green-200';
+    case 'pro':
+      return 'bg-blue-100 text-blue-700 border-blue-200';
+    case 'pro+':
+      return 'bg-purple-100 text-purple-700 border-purple-200';
+    case 'business':
+      return 'bg-orange-100 text-orange-700 border-orange-200';
+    case 'enterprise':
+      return 'bg-red-100 text-red-700 border-red-200';
+    default:
+      return 'bg-muted text-muted-foreground';
+  }
+}
+
+/** Get multiplier display */
+function getMultiplierDisplay(multiplier?: number): string | null {
+  if (multiplier === undefined || multiplier === null) return null;
+  if (multiplier === 0) return 'Free';
+  if (multiplier < 1) return `${multiplier}x`;
+  if (multiplier === 1) return '1x';
+  return `${multiplier}x`;
+}
+
+function FlexibleModelSelector({
+  label,
+  description,
+  value,
+  onChange,
+  models,
+  disabled,
+}: FlexibleModelSelectorProps) {
+  // Find current model for display
+  const currentModel = models.find((m) => m.id === value);
+
+  return (
+    <div className="space-y-1.5">
+      <div>
+        <label className="text-xs font-medium">{label}</label>
+        {description && <p className="text-[10px] text-muted-foreground">{description}</p>}
+      </div>
+      <Select value={value || ''} onValueChange={onChange} disabled={disabled}>
+        <SelectTrigger className="h-9">
+          <SelectValue placeholder="Select model">
+            {value && (
+              <div className="flex items-center gap-2">
+                <span className="truncate font-mono text-xs">{value}</span>
+                {currentModel?.minPlan && (
+                  <Badge
+                    variant="outline"
+                    className={`text-[9px] px-1 py-0 h-4 ${getPlanBadgeStyle(currentModel.minPlan)}`}
+                  >
+                    {currentModel.minPlan}
+                  </Badge>
+                )}
+              </div>
+            )}
+          </SelectValue>
+        </SelectTrigger>
+        <SelectContent className="max-h-[300px]">
+          <SelectGroup>
+            <SelectLabel className="text-xs text-muted-foreground">
+              Available Models ({models.length})
+            </SelectLabel>
+            {models.map((model) => (
+              <SelectItem key={model.id} value={model.id}>
+                <div className="flex items-center gap-2">
+                  <span className="truncate font-mono text-xs">{model.name || model.id}</span>
+                  {model.minPlan && (
+                    <Badge
+                      variant="outline"
+                      className={`text-[9px] px-1 py-0 h-4 ${getPlanBadgeStyle(model.minPlan)}`}
+                    >
+                      {model.minPlan}
+                    </Badge>
+                  )}
+                  {model.multiplier !== undefined && (
+                    <span className="text-[9px] text-muted-foreground">
+                      {getMultiplierDisplay(model.multiplier)}
+                    </span>
+                  )}
+                  {model.preview && (
+                    <Badge variant="secondary" className="text-[9px] px-1 py-0 h-4">
+                      Preview
+                    </Badge>
+                  )}
+                  {value === model.id && <Check className="w-3 h-3 text-primary ml-auto" />}
+                </div>
+              </SelectItem>
+            ))}
+          </SelectGroup>
+        </SelectContent>
+      </Select>
+    </div>
+  );
+}
+
+export function CopilotConfigForm() {
+  const {
+    config,
+    configLoading,
+    models,
+    modelsLoading,
+    rawSettings,
+    rawSettingsLoading,
+    updateConfigAsync,
+    isUpdating,
+    saveRawSettingsAsync,
+    isSavingRawSettings,
+    refetchRawSettings,
+  } = useCopilot();
+
+  // Track local overrides for form fields
+  const [localOverrides, setLocalOverrides] = useState<{
+    enabled?: boolean;
+    autoStart?: boolean;
+    port?: number;
+    accountType?: 'individual' | 'business' | 'enterprise';
+    model?: string;
+    rateLimit?: string;
+    waitOnLimit?: boolean;
+    opusModel?: string;
+    sonnetModel?: string;
+    haikuModel?: string;
+  }>({});
+
+  // Raw JSON editor state
+  const [rawJsonEdits, setRawJsonEdits] = useState<string | null>(null);
+  const [conflictDialog, setConflictDialog] = useState(false);
+
+  // Use local overrides if set, otherwise use config values
+  const enabled = localOverrides.enabled ?? config?.enabled ?? false;
+  const autoStart = localOverrides.autoStart ?? config?.auto_start ?? false;
+  const port = localOverrides.port ?? config?.port ?? 4141;
+  const accountType = localOverrides.accountType ?? config?.account_type ?? 'individual';
+  const currentModel = localOverrides.model ?? config?.model ?? 'claude-opus-4-5-20250514';
+  const rateLimit = localOverrides.rateLimit ?? config?.rate_limit?.toString() ?? '';
+  const waitOnLimit = localOverrides.waitOnLimit ?? config?.wait_on_limit ?? true;
+  const opusModel = localOverrides.opusModel ?? config?.opus_model ?? '';
+  const sonnetModel = localOverrides.sonnetModel ?? config?.sonnet_model ?? '';
+  const haikuModel = localOverrides.haikuModel ?? config?.haiku_model ?? '';
+
+  const updateField = <K extends keyof typeof localOverrides>(
+    key: K,
+    value: (typeof localOverrides)[K]
+  ) => {
+    setLocalOverrides((prev) => ({ ...prev, [key]: value }));
+  };
+
+  // Batch update for presets
+  const applyPreset = (preset: (typeof FREE_PRESETS)[0] | (typeof PAID_PRESETS)[0]) => {
+    setLocalOverrides((prev) => ({
+      ...prev,
+      model: preset.default,
+      opusModel: preset.opus,
+      sonnetModel: preset.sonnet,
+      haikuModel: preset.haiku,
+    }));
+    toast.success(`Applied "${preset.name}" preset`);
+  };
+
+  // Raw JSON content
+  const rawJsonContent = useMemo(() => {
+    if (rawJsonEdits !== null) return rawJsonEdits;
+    if (rawSettings?.settings) return JSON.stringify(rawSettings.settings, null, 2);
+    return '{\n  "env": {}\n}';
+  }, [rawJsonEdits, rawSettings]);
+
+  const handleRawJsonChange = useCallback((value: string) => {
+    setRawJsonEdits(value);
+  }, []);
+
+  // Check if JSON is valid
+  const isRawJsonValid = useMemo(() => {
+    try {
+      JSON.parse(rawJsonContent);
+      return true;
+    } catch {
+      return false;
+    }
+  }, [rawJsonContent]);
+
+  // Check for unsaved changes
+  const hasChanges = useMemo(() => {
+    const hasLocalChanges = Object.keys(localOverrides).length > 0;
+    const hasJsonChanges =
+      rawJsonEdits !== null && rawJsonEdits !== JSON.stringify(rawSettings?.settings, null, 2);
+    return hasLocalChanges || hasJsonChanges;
+  }, [localOverrides, rawJsonEdits, rawSettings]);
+
+  const handleSave = async () => {
+    try {
+      // Save config changes
+      if (Object.keys(localOverrides).length > 0) {
+        await updateConfigAsync({
+          enabled,
+          auto_start: autoStart,
+          port,
+          account_type: accountType,
+          model: currentModel,
+          rate_limit: rateLimit ? parseInt(rateLimit, 10) : null,
+          wait_on_limit: waitOnLimit,
+          opus_model: opusModel || undefined,
+          sonnet_model: sonnetModel || undefined,
+          haiku_model: haikuModel || undefined,
+        });
+      }
+
+      // Save raw JSON changes
+      if (rawJsonEdits !== null && isRawJsonValid) {
+        const settingsToSave = JSON.parse(rawJsonContent);
+        await saveRawSettingsAsync({
+          settings: settingsToSave,
+          expectedMtime: rawSettings?.mtime,
+        });
+      }
+
+      // Clear local state
+      setLocalOverrides({});
+      setRawJsonEdits(null);
+      toast.success('Copilot configuration saved');
+    } catch (error) {
+      if ((error as Error).message === 'CONFLICT') {
+        setConflictDialog(true);
+      } else {
+        toast.error('Failed to save settings');
+      }
+    }
+  };
+
+  const handleConflictResolve = async (overwrite: boolean) => {
+    setConflictDialog(false);
+    if (overwrite) {
+      await refetchRawSettings();
+      handleSave();
+    } else {
+      setRawJsonEdits(null);
+    }
+  };
+
+  if (configLoading || rawSettingsLoading) {
+    return (
+      <div className="space-y-6">
+        <Skeleton className="h-10 w-full" />
+        <Skeleton className="h-10 w-full" />
+        <Skeleton className="h-10 w-full" />
+        <Skeleton className="h-10 w-full" />
+      </div>
+    );
+  }
+
+  // Left column: Friendly UI
+  const renderFriendlyUI = () => (
+    <div className="h-full flex flex-col">
+      <Tabs defaultValue="config" className="h-full flex flex-col">
+        <div className="px-4 pt-4 shrink-0">
+          <TabsList className="w-full">
+            <TabsTrigger value="config" className="flex-1">
+              Model Config
+            </TabsTrigger>
+            <TabsTrigger value="settings" className="flex-1">
+              Settings
+            </TabsTrigger>
+            <TabsTrigger value="info" className="flex-1">
+              Info
+            </TabsTrigger>
+          </TabsList>
+        </div>
+
+        <div className="flex-1 overflow-hidden flex flex-col">
+          {/* Model Config Tab */}
+          <TabsContent
+            value="config"
+            className="flex-1 mt-0 border-0 p-0 data-[state=inactive]:hidden flex flex-col overflow-hidden"
+          >
+            <ScrollArea className="flex-1">
+              <div className="p-4 space-y-6">
+                {/* Quick Presets */}
+                <div>
+                  <h3 className="text-sm font-medium mb-2 flex items-center gap-2">
+                    <Sparkles className="w-4 h-4" />
+                    Presets
+                  </h3>
+                  <p className="text-xs text-muted-foreground mb-3">
+                    Apply pre-configured model mappings
+                  </p>
+
+                  {/* Free Tier Presets */}
+                  <div className="mb-4">
+                    <div className="flex items-center gap-2 mb-2">
+                      <Badge
+                        variant="outline"
+                        className="text-[10px] bg-green-100 text-green-700 border-green-200"
+                      >
+                        Free Tier
+                      </Badge>
+                      <span className="text-[10px] text-muted-foreground">
+                        No premium usage count
+                      </span>
+                    </div>
+                    <div className="flex flex-wrap gap-2">
+                      {FREE_PRESETS.map((preset) => (
+                        <Button
+                          key={preset.name}
+                          variant="outline"
+                          size="sm"
+                          className="text-xs h-7 gap-1"
+                          onClick={() => applyPreset(preset)}
+                          title={preset.description}
+                        >
+                          <Zap className="w-3 h-3 text-green-600" />
+                          {preset.name}
+                        </Button>
+                      ))}
+                    </div>
+                  </div>
+
+                  {/* Paid Tier Presets */}
+                  <div>
+                    <div className="flex items-center gap-2 mb-2">
+                      <Badge
+                        variant="outline"
+                        className="text-[10px] bg-blue-100 text-blue-700 border-blue-200"
+                      >
+                        Pro+ Required
+                      </Badge>
+                      <span className="text-[10px] text-muted-foreground">
+                        Uses premium request quota
+                      </span>
+                    </div>
+                    <div className="flex flex-wrap gap-2">
+                      {PAID_PRESETS.map((preset) => (
+                        <Button
+                          key={preset.name}
+                          variant="outline"
+                          size="sm"
+                          className="text-xs h-7 gap-1"
+                          onClick={() => applyPreset(preset)}
+                          title={preset.description}
+                        >
+                          <Zap className="w-3 h-3" />
+                          {preset.name}
+                        </Button>
+                      ))}
+                    </div>
+                  </div>
+                </div>
+
+                <Separator />
+
+                {/* Model Mapping */}
+                <div>
+                  <h3 className="text-sm font-medium mb-2">Model Mapping</h3>
+                  <p className="text-xs text-muted-foreground mb-4">
+                    Configure which models to use for each tier
+                  </p>
+                  <div className="space-y-4">
+                    <FlexibleModelSelector
+                      label="Default Model"
+                      description="Used when no specific tier is requested"
+                      value={currentModel}
+                      onChange={(model) => updateField('model', model)}
+                      models={models}
+                      disabled={modelsLoading}
+                    />
+                    <FlexibleModelSelector
+                      label="Opus (Most capable)"
+                      description="For complex reasoning tasks"
+                      value={opusModel || currentModel}
+                      onChange={(model) => updateField('opusModel', model)}
+                      models={models}
+                      disabled={modelsLoading}
+                    />
+                    <FlexibleModelSelector
+                      label="Sonnet (Balanced)"
+                      description="Balance of speed and capability"
+                      value={sonnetModel || currentModel}
+                      onChange={(model) => updateField('sonnetModel', model)}
+                      models={models}
+                      disabled={modelsLoading}
+                    />
+                    <FlexibleModelSelector
+                      label="Haiku (Fast)"
+                      description="Quick responses for simple tasks"
+                      value={haikuModel || currentModel}
+                      onChange={(model) => updateField('haikuModel', model)}
+                      models={models}
+                      disabled={modelsLoading}
+                    />
+                  </div>
+                </div>
+              </div>
+            </ScrollArea>
+          </TabsContent>
+
+          {/* Settings Tab */}
+          <TabsContent
+            value="settings"
+            className="flex-1 mt-0 border-0 p-0 data-[state=inactive]:hidden flex flex-col overflow-hidden"
+          >
+            <ScrollArea className="flex-1">
+              <div className="p-4 space-y-6">
+                {/* Enable Toggle */}
+                <div className="flex items-center justify-between rounded-lg border p-4">
+                  <div className="space-y-0.5">
+                    <Label htmlFor="enabled" className="text-sm font-medium">
+                      Enable Copilot
+                    </Label>
+                    <p className="text-xs text-muted-foreground">
+                      Allow using GitHub Copilot subscription
+                    </p>
+                  </div>
+                  <Switch
+                    id="enabled"
+                    checked={enabled}
+                    onCheckedChange={(v) => updateField('enabled', v)}
+                  />
+                </div>
+
+                {/* Basic Settings */}
+                <div className="space-y-4">
+                  <h3 className="text-sm font-medium">Basic Settings</h3>
+
+                  {/* Port */}
+                  <div className="space-y-2">
+                    <Label htmlFor="port" className="text-xs">
+                      Port
+                    </Label>
+                    <Input
+                      id="port"
+                      type="number"
+                      value={port}
+                      onChange={(e) => updateField('port', parseInt(e.target.value, 10))}
+                      min={1024}
+                      max={65535}
+                      className="max-w-[150px] h-8"
+                    />
+                  </div>
+
+                  {/* Account Type */}
+                  <div className="space-y-2">
+                    <Label htmlFor="account-type" className="text-xs">
+                      Account Type
+                    </Label>
+                    <Select
+                      value={accountType}
+                      onValueChange={(v) => updateField('accountType', v as typeof accountType)}
+                    >
+                      <SelectTrigger id="account-type" className="max-w-[150px] h-8">
+                        <SelectValue />
+                      </SelectTrigger>
+                      <SelectContent>
+                        <SelectItem value="individual">Individual</SelectItem>
+                        <SelectItem value="business">Business</SelectItem>
+                        <SelectItem value="enterprise">Enterprise</SelectItem>
+                      </SelectContent>
+                    </Select>
+                  </div>
+                </div>
+
+                <Separator />
+
+                {/* Rate Limiting */}
+                <div className="space-y-4">
+                  <h3 className="text-sm font-medium">Rate Limiting</h3>
+
+                  <div className="space-y-2">
+                    <Label htmlFor="rate-limit" className="text-xs">
+                      Rate Limit (seconds)
+                    </Label>
+                    <Input
+                      id="rate-limit"
+                      type="number"
+                      value={rateLimit}
+                      onChange={(e) => updateField('rateLimit', e.target.value)}
+                      placeholder="No limit"
+                      min={0}
+                      className="max-w-[150px] h-8"
+                    />
+                  </div>
+
+                  <div className="flex items-center justify-between rounded-lg border p-3">
+                    <div className="space-y-0.5">
+                      <Label htmlFor="wait-on-limit" className="text-xs">
+                        Wait on Rate Limit
+                      </Label>
+                      <p className="text-[10px] text-muted-foreground">
+                        Wait instead of error when limit hit
+                      </p>
+                    </div>
+                    <Switch
+                      id="wait-on-limit"
+                      checked={waitOnLimit}
+                      onCheckedChange={(v) => updateField('waitOnLimit', v)}
+                    />
+                  </div>
+                </div>
+
+                <Separator />
+
+                {/* Daemon Settings */}
+                <div className="space-y-4">
+                  <h3 className="text-sm font-medium">Daemon Settings</h3>
+
+                  <div className="flex items-center justify-between rounded-lg border p-3">
+                    <div className="space-y-0.5">
+                      <Label htmlFor="auto-start" className="text-xs">
+                        Auto-start Daemon
+                      </Label>
+                      <p className="text-[10px] text-muted-foreground">
+                        Start copilot-api when using profile
+                      </p>
+                    </div>
+                    <Switch
+                      id="auto-start"
+                      checked={autoStart}
+                      onCheckedChange={(v) => updateField('autoStart', v)}
+                    />
+                  </div>
+                </div>
+              </div>
+            </ScrollArea>
+          </TabsContent>
+
+          {/* Info Tab */}
+          <TabsContent
+            value="info"
+            className="h-full mt-0 border-0 p-0 data-[state=inactive]:hidden"
+          >
+            <ScrollArea className="h-full">
+              <div className="p-4 space-y-6">
+                <div>
+                  <h3 className="text-sm font-medium flex items-center gap-2 mb-3">
+                    <Info className="w-4 h-4" />
+                    Configuration Info
+                  </h3>
+                  <div className="space-y-3 bg-card rounded-lg border p-4 shadow-sm">
+                    <div className="grid grid-cols-[100px_1fr] gap-2 text-sm items-center">
+                      <span className="font-medium text-muted-foreground">Provider</span>
+                      <span className="font-mono">GitHub Copilot</span>
+                    </div>
+                    {rawSettings && (
+                      <>
+                        <div className="grid grid-cols-[100px_1fr] gap-2 text-sm items-center">
+                          <span className="font-medium text-muted-foreground">File Path</span>
+                          <div className="flex items-center gap-2 min-w-0">
+                            <code className="bg-muted px-1.5 py-0.5 rounded text-xs break-all">
+                              {rawSettings.path}
+                            </code>
+                            <CopyButton value={rawSettings.path} size="icon" className="h-5 w-5" />
+                          </div>
+                        </div>
+                        <div className="grid grid-cols-[100px_1fr] gap-2 text-sm items-center">
+                          <span className="font-medium text-muted-foreground">Status</span>
+                          <Badge
+                            variant="outline"
+                            className={
+                              rawSettings.exists
+                                ? 'w-fit text-green-600 border-green-200 bg-green-50'
+                                : 'w-fit text-muted-foreground'
+                            }
+                          >
+                            {rawSettings.exists ? 'File exists' : 'Using defaults'}
+                          </Badge>
+                        </div>
+                      </>
+                    )}
+                  </div>
+                </div>
+
+                <div>
+                  <h3 className="text-sm font-medium mb-3">Quick Usage</h3>
+                  <div className="space-y-3 bg-card rounded-lg border p-4 shadow-sm">
+                    <UsageCommand label="Run with Copilot" command="ccs copilot" />
+                    <UsageCommand label="Authenticate" command="ccs copilot auth" />
+                    <UsageCommand label="Start daemon" command="ccs copilot --start" />
+                    <UsageCommand label="Stop daemon" command="ccs copilot --stop" />
+                  </div>
+                </div>
+              </div>
+            </ScrollArea>
+          </TabsContent>
+        </div>
+      </Tabs>
+    </div>
+  );
+
+  // Right column: Raw JSON Editor
+  const renderRawEditor = () => (
+    <Suspense
+      fallback={
+        <div className="flex items-center justify-center h-full">
+          <Loader2 className="w-6 h-6 animate-spin text-muted-foreground" />
+          <span className="ml-2 text-muted-foreground">Loading editor...</span>
+        </div>
+      }
+    >
+      <div className="h-full flex flex-col">
+        {!isRawJsonValid && rawJsonEdits !== null && (
+          <div className="mb-2 px-3 py-2 bg-destructive/10 text-destructive text-sm rounded-md flex items-center gap-2 mx-6 mt-4 shrink-0">
+            <X className="w-4 h-4" />
+            Invalid JSON syntax
+          </div>
+        )}
+        <div className="flex-1 overflow-hidden px-6 pb-6 pt-4">
+          <div className="h-full border rounded-md overflow-hidden bg-background">
+            <CodeEditor
+              value={rawJsonContent}
+              onChange={handleRawJsonChange}
+              language="json"
+              minHeight="100%"
+            />
+          </div>
+        </div>
+      </div>
+    </Suspense>
+  );
+
+  return (
+    <div className="flex-1 flex flex-col overflow-hidden">
+      {/* Header */}
+      <div className="px-6 py-4 border-b bg-background flex items-center justify-between shrink-0">
+        <div className="flex items-center gap-3">
+          <div>
+            <div className="flex items-center gap-2">
+              <h2 className="text-lg font-semibold">Copilot Configuration</h2>
+              {rawSettings && (
+                <Badge variant="outline" className="text-xs">
+                  copilot.settings.json
+                </Badge>
+              )}
+            </div>
+            {rawSettings && (
+              <p className="text-xs text-muted-foreground mt-0.5">
+                Last modified:{' '}
+                {rawSettings.exists ? new Date(rawSettings.mtime).toLocaleString() : 'Never saved'}
+              </p>
+            )}
+          </div>
+        </div>
+        <div className="flex items-center gap-2">
+          <Button
+            variant="ghost"
+            size="sm"
+            onClick={() => refetchRawSettings()}
+            disabled={rawSettingsLoading}
+          >
+            <RefreshCw className={`w-4 h-4 ${rawSettingsLoading ? 'animate-spin' : ''}`} />
+          </Button>
+          <Button
+            size="sm"
+            onClick={handleSave}
+            disabled={isUpdating || isSavingRawSettings || !hasChanges || !isRawJsonValid}
+          >
+            {isUpdating || isSavingRawSettings ? (
+              <>
+                <Loader2 className="w-4 h-4 mr-1 animate-spin" />
+                Saving...
+              </>
+            ) : (
+              <>
+                <Save className="w-4 h-4 mr-1" />
+                Save
+              </>
+            )}
+          </Button>
+        </div>
+      </div>
+
+      {/* Split Layout - Left panel constrained, Right panel flexible */}
+      <div className="flex-1 flex divide-x overflow-hidden">
+        {/* Left Column: Friendly UI - constrained width */}
+        <div className="w-[540px] shrink-0 flex flex-col overflow-hidden bg-muted/5">
+          {renderFriendlyUI()}
+        </div>
+
+        {/* Right Column: Raw Editor - takes remaining space */}
+        <div className="flex-1 min-w-0 flex flex-col overflow-hidden">
+          <div className="px-6 py-2 bg-muted/30 border-b flex items-center gap-2 shrink-0 h-[45px]">
+            <Code2 className="w-4 h-4 text-muted-foreground" />
+            <span className="text-sm font-medium text-muted-foreground">
+              Raw Configuration (JSON)
+            </span>
+          </div>
+          {renderRawEditor()}
+        </div>
+      </div>
+
+      <ConfirmDialog
+        open={conflictDialog}
+        title="File Modified Externally"
+        description="This settings file was modified by another process. Overwrite with your changes or discard?"
+        confirmText="Overwrite"
+        variant="destructive"
+        onConfirm={() => handleConflictResolve(true)}
+        onCancel={() => handleConflictResolve(false)}
+      />
+    </div>
+  );
+}
+
+/** Usage command with copy button */
+function UsageCommand({ label, command }: { label: string; command: string }) {
+  return (
+    <div>
+      <label className="text-xs text-muted-foreground">{label}</label>
+      <div className="mt-1 flex gap-2">
+        <code className="flex-1 px-2 py-1.5 bg-muted rounded text-xs font-mono truncate">
+          {command}
+        </code>
+        <CopyButton value={command} size="icon" className="h-6 w-6" />
+      </div>
+    </div>
+  );
+}
diff --git a/ui/src/components/copilot/copilot-status-card.tsx b/ui/src/components/copilot/copilot-status-card.tsx
new file mode 100644
index 00000000..a877d3d8
--- /dev/null
+++ b/ui/src/components/copilot/copilot-status-card.tsx
@@ -0,0 +1,191 @@
+/**
+ * Copilot Status Card
+ *
+ * Displays GitHub Copilot integration status overview.
+ */
+
+import { Card, CardContent, CardDescription, CardHeader, CardTitle } from '@/components/ui/card';
+import { Badge } from '@/components/ui/badge';
+import { Button } from '@/components/ui/button';
+import { useCopilot } from '@/hooks/use-copilot';
+import { CheckCircle2, XCircle, AlertTriangle, Loader2, Download } from 'lucide-react';
+
+export function CopilotStatusCard() {
+  const {
+    status,
+    statusLoading,
+    startAuth,
+    isAuthenticating,
+    startDaemon,
+    isStartingDaemon,
+    stopDaemon,
+    isStoppingDaemon,
+    install,
+    isInstalling,
+  } = useCopilot();
+
+  if (statusLoading) {
+    return (
+      <Card>
+        <CardHeader>
+          <CardTitle>GitHub Copilot Status</CardTitle>
+        </CardHeader>
+        <CardContent className="flex items-center justify-center py-8">
+          <Loader2 className="h-6 w-6 animate-spin" />
+        </CardContent>
+      </Card>
+    );
+  }
+
+  if (!status) {
+    return (
+      <Card>
+        <CardHeader>
+          <CardTitle>GitHub Copilot Status</CardTitle>
+        </CardHeader>
+        <CardContent>
+          <p className="text-muted-foreground">Failed to load status</p>
+        </CardContent>
+      </Card>
+    );
+  }
+
+  return (
+    <Card>
+      <CardHeader>
+        <CardTitle className="flex items-center gap-2">
+          GitHub Copilot Status
+          {status.enabled ? (
+            <Badge variant="default">Enabled</Badge>
+          ) : (
+            <Badge variant="secondary">Disabled</Badge>
+          )}
+        </CardTitle>
+        <CardDescription>Use your GitHub Copilot subscription with Claude Code</CardDescription>
+      </CardHeader>
+      <CardContent className="space-y-4">
+        {/* Warning Banner */}
+        <div className="flex items-start gap-2 rounded-md border border-yellow-500/20 bg-yellow-500/10 p-3">
+          <AlertTriangle className="h-5 w-5 text-yellow-500 shrink-0 mt-0.5" />
+          <p className="text-sm text-yellow-700 dark:text-yellow-300">
+            This uses a reverse-engineered API. Excessive usage may trigger GitHub abuse detection.
+          </p>
+        </div>
+
+        {/* Status Grid */}
+        <div className="grid gap-4 md:grid-cols-3">
+          {/* Installed */}
+          <div className="flex items-center gap-2">
+            {status.installed ? (
+              <CheckCircle2 className="h-5 w-5 text-green-500" />
+            ) : (
+              <XCircle className="h-5 w-5 text-red-500" />
+            )}
+            <span className="text-sm">
+              copilot-api {status.installed ? `v${status.version}` : 'Not Installed'}
+            </span>
+          </div>
+
+          {/* Authenticated */}
+          <div className="flex items-center gap-2">
+            {status.authenticated ? (
+              <CheckCircle2 className="h-5 w-5 text-green-500" />
+            ) : (
+              <XCircle className="h-5 w-5 text-red-500" />
+            )}
+            <span className="text-sm">
+              {status.authenticated ? 'Authenticated' : 'Not Authenticated'}
+            </span>
+          </div>
+
+          {/* Daemon */}
+          <div className="flex items-center gap-2">
+            {status.daemon_running ? (
+              <CheckCircle2 className="h-5 w-5 text-green-500" />
+            ) : (
+              <XCircle className="h-5 w-5 text-muted-foreground" />
+            )}
+            <span className="text-sm">Daemon {status.daemon_running ? 'Running' : 'Stopped'}</span>
+          </div>
+        </div>
+
+        {/* Quick Info */}
+        <div className="flex flex-wrap gap-4 text-sm text-muted-foreground">
+          <span>Port: {status.port}</span>
+          <span>Model: {status.model}</span>
+          <span>Auto-start: {status.auto_start ? 'Yes' : 'No'}</span>
+        </div>
+
+        {/* Actions */}
+        <div className="flex flex-wrap gap-2 pt-2">
+          {!status.installed && (
+            <Button onClick={() => install(undefined)} disabled={isInstalling} size="sm">
+              {isInstalling ? (
+                <>
+                  <Loader2 className="mr-2 h-4 w-4 animate-spin" />
+                  Installing...
+                </>
+              ) : (
+                <>
+                  <Download className="mr-2 h-4 w-4" />
+                  Install copilot-api
+                </>
+              )}
+            </Button>
+          )}
+
+          {!status.authenticated && (
+            <Button
+              onClick={() => startAuth()}
+              disabled={isAuthenticating || !status.installed}
+              size="sm"
+            >
+              {isAuthenticating ? (
+                <>
+                  <Loader2 className="mr-2 h-4 w-4 animate-spin" />
+                  Authenticating...
+                </>
+              ) : (
+                'Authenticate with GitHub'
+              )}
+            </Button>
+          )}
+
+          {status.daemon_running ? (
+            <Button
+              onClick={() => stopDaemon()}
+              disabled={isStoppingDaemon}
+              variant="outline"
+              size="sm"
+            >
+              {isStoppingDaemon ? (
+                <>
+                  <Loader2 className="mr-2 h-4 w-4 animate-spin" />
+                  Stopping...
+                </>
+              ) : (
+                'Stop Daemon'
+              )}
+            </Button>
+          ) : (
+            <Button
+              onClick={() => startDaemon()}
+              disabled={isStartingDaemon || !status.authenticated}
+              variant="outline"
+              size="sm"
+            >
+              {isStartingDaemon ? (
+                <>
+                  <Loader2 className="mr-2 h-4 w-4 animate-spin" />
+                  Starting...
+                </>
+              ) : (
+                'Start Daemon'
+              )}
+            </Button>
+          )}
+        </div>
+      </CardContent>
+    </Card>
+  );
+}
diff --git a/ui/src/hooks/use-copilot.ts b/ui/src/hooks/use-copilot.ts
new file mode 100644
index 00000000..3431ffdb
--- /dev/null
+++ b/ui/src/hooks/use-copilot.ts
@@ -0,0 +1,300 @@
+/**
+ * Copilot API Hook
+ *
+ * React hook for managing GitHub Copilot integration state.
+ */
+
+import { useQuery, useMutation, useQueryClient } from '@tanstack/react-query';
+
+const API_BASE = '/api';
+
+// Types
+export interface CopilotStatus {
+  enabled: boolean;
+  installed: boolean;
+  version: string | null;
+  authenticated: boolean;
+  daemon_running: boolean;
+  port: number;
+  model: string;
+  account_type: 'individual' | 'business' | 'enterprise';
+  auto_start: boolean;
+  rate_limit: number | null;
+  wait_on_limit: boolean;
+}
+
+export interface CopilotInfo {
+  installed: boolean;
+  version: string | null;
+  path: string;
+  pinnedVersion: string | null;
+}
+
+export interface CopilotInstallResult {
+  success: boolean;
+  installed: boolean;
+  version: string | null;
+  path: string;
+}
+
+export interface CopilotConfig {
+  enabled: boolean;
+  auto_start: boolean;
+  port: number;
+  account_type: 'individual' | 'business' | 'enterprise';
+  rate_limit: number | null;
+  wait_on_limit: boolean;
+  model: string;
+  // Model mapping for Claude tiers
+  opus_model?: string;
+  sonnet_model?: string;
+  haiku_model?: string;
+}
+
+/** GitHub Copilot plan tiers */
+export type CopilotPlanTier = 'free' | 'pro' | 'pro+' | 'business' | 'enterprise';
+
+export interface CopilotModel {
+  id: string;
+  name: string;
+  provider: 'openai' | 'anthropic';
+  isDefault?: boolean;
+  isCurrent?: boolean;
+  /** Minimum plan tier required (free = available to all) */
+  minPlan?: CopilotPlanTier;
+  /** Premium request multiplier (0 = free, higher = more expensive) */
+  multiplier?: number;
+  /** Whether this model is in preview */
+  preview?: boolean;
+}
+
+export interface CopilotRawSettings {
+  settings: {
+    env?: Record<string, string>;
+  };
+  mtime: number;
+  path: string;
+  exists: boolean;
+}
+
+// API functions
+async function fetchCopilotStatus(): Promise<CopilotStatus> {
+  const res = await fetch(`${API_BASE}/copilot/status`);
+  if (!res.ok) throw new Error('Failed to fetch copilot status');
+  return res.json();
+}
+
+async function fetchCopilotConfig(): Promise<CopilotConfig> {
+  const res = await fetch(`${API_BASE}/copilot/config`);
+  if (!res.ok) throw new Error('Failed to fetch copilot config');
+  return res.json();
+}
+
+async function fetchCopilotModels(): Promise<{ models: CopilotModel[]; current: string }> {
+  const res = await fetch(`${API_BASE}/copilot/models`);
+  if (!res.ok) throw new Error('Failed to fetch copilot models');
+  return res.json();
+}
+
+async function fetchCopilotRawSettings(): Promise<CopilotRawSettings> {
+  const res = await fetch(`${API_BASE}/copilot/settings/raw`);
+  if (!res.ok) throw new Error('Failed to fetch copilot raw settings');
+  return res.json();
+}
+
+async function updateCopilotConfig(config: Partial<CopilotConfig>): Promise<{ success: boolean }> {
+  const res = await fetch(`${API_BASE}/copilot/config`, {
+    method: 'PUT',
+    headers: { 'Content-Type': 'application/json' },
+    body: JSON.stringify(config),
+  });
+  if (!res.ok) throw new Error('Failed to update copilot config');
+  return res.json();
+}
+
+async function saveCopilotRawSettings(data: {
+  settings: CopilotRawSettings['settings'];
+  expectedMtime?: number;
+}): Promise<{ success: boolean; mtime: number }> {
+  const res = await fetch(`${API_BASE}/copilot/settings/raw`, {
+    method: 'PUT',
+    headers: { 'Content-Type': 'application/json' },
+    body: JSON.stringify(data),
+  });
+  if (res.status === 409) throw new Error('CONFLICT');
+  if (!res.ok) throw new Error('Failed to save copilot raw settings');
+  return res.json();
+}
+
+export interface CopilotAuthResult {
+  success: boolean;
+  error?: string;
+  deviceCode?: string;
+  verificationUrl?: string;
+}
+
+async function startCopilotAuth(): Promise<CopilotAuthResult> {
+  const res = await fetch(`${API_BASE}/copilot/auth/start`, { method: 'POST' });
+  if (!res.ok) throw new Error('Failed to start auth');
+  return res.json();
+}
+
+async function startCopilotDaemon(): Promise<{ success: boolean; pid?: number; error?: string }> {
+  const res = await fetch(`${API_BASE}/copilot/daemon/start`, { method: 'POST' });
+  if (!res.ok) throw new Error('Failed to start daemon');
+  return res.json();
+}
+
+async function stopCopilotDaemon(): Promise<{ success: boolean; error?: string }> {
+  const res = await fetch(`${API_BASE}/copilot/daemon/stop`, { method: 'POST' });
+  if (!res.ok) throw new Error('Failed to stop daemon');
+  return res.json();
+}
+
+async function fetchCopilotInfo(): Promise<CopilotInfo> {
+  const res = await fetch(`${API_BASE}/copilot/info`);
+  if (!res.ok) throw new Error('Failed to fetch copilot info');
+  return res.json();
+}
+
+async function installCopilotApi(version?: string): Promise<CopilotInstallResult> {
+  const res = await fetch(`${API_BASE}/copilot/install`, {
+    method: 'POST',
+    headers: { 'Content-Type': 'application/json' },
+    body: JSON.stringify(version ? { version } : {}),
+  });
+  if (!res.ok) throw new Error('Failed to install copilot-api');
+  return res.json();
+}
+
+// Hook
+export function useCopilot() {
+  const queryClient = useQueryClient();
+
+  // Queries
+  const statusQuery = useQuery({
+    queryKey: ['copilot-status'],
+    queryFn: fetchCopilotStatus,
+    refetchInterval: 5000, // Refresh every 5 seconds
+  });
+
+  const configQuery = useQuery({
+    queryKey: ['copilot-config'],
+    queryFn: fetchCopilotConfig,
+  });
+
+  const modelsQuery = useQuery({
+    queryKey: ['copilot-models'],
+    queryFn: fetchCopilotModels,
+  });
+
+  const rawSettingsQuery = useQuery({
+    queryKey: ['copilot-raw-settings'],
+    queryFn: fetchCopilotRawSettings,
+  });
+
+  const infoQuery = useQuery({
+    queryKey: ['copilot-info'],
+    queryFn: fetchCopilotInfo,
+  });
+
+  // Mutations
+  const updateConfigMutation = useMutation({
+    mutationFn: updateCopilotConfig,
+    onSuccess: () => {
+      queryClient.invalidateQueries({ queryKey: ['copilot-status'] });
+      queryClient.invalidateQueries({ queryKey: ['copilot-config'] });
+      queryClient.invalidateQueries({ queryKey: ['copilot-raw-settings'] });
+    },
+  });
+
+  const saveRawSettingsMutation = useMutation({
+    mutationFn: saveCopilotRawSettings,
+    onSuccess: () => {
+      queryClient.invalidateQueries({ queryKey: ['copilot-status'] });
+      queryClient.invalidateQueries({ queryKey: ['copilot-config'] });
+      queryClient.invalidateQueries({ queryKey: ['copilot-raw-settings'] });
+    },
+  });
+
+  const startAuthMutation = useMutation({
+    mutationFn: startCopilotAuth,
+    onSuccess: () => {
+      // Auth completed - immediately refetch status
+      queryClient.invalidateQueries({ queryKey: ['copilot-status'] });
+    },
+  });
+
+  const startDaemonMutation = useMutation({
+    mutationFn: startCopilotDaemon,
+    onSuccess: () => {
+      queryClient.invalidateQueries({ queryKey: ['copilot-status'] });
+    },
+  });
+
+  const stopDaemonMutation = useMutation({
+    mutationFn: stopCopilotDaemon,
+    onSuccess: () => {
+      queryClient.invalidateQueries({ queryKey: ['copilot-status'] });
+    },
+  });
+
+  const installMutation = useMutation({
+    mutationFn: installCopilotApi,
+    onSuccess: () => {
+      queryClient.invalidateQueries({ queryKey: ['copilot-status'] });
+      queryClient.invalidateQueries({ queryKey: ['copilot-info'] });
+    },
+  });
+
+  return {
+    // Status
+    status: statusQuery.data,
+    statusLoading: statusQuery.isLoading,
+    statusError: statusQuery.error,
+    refetchStatus: statusQuery.refetch,
+
+    // Config
+    config: configQuery.data,
+    configLoading: configQuery.isLoading,
+
+    // Models
+    models: modelsQuery.data?.models ?? [],
+    currentModel: modelsQuery.data?.current,
+    modelsLoading: modelsQuery.isLoading,
+
+    // Raw Settings
+    rawSettings: rawSettingsQuery.data,
+    rawSettingsLoading: rawSettingsQuery.isLoading,
+    refetchRawSettings: rawSettingsQuery.refetch,
+
+    // Mutations
+    updateConfig: updateConfigMutation.mutate,
+    updateConfigAsync: updateConfigMutation.mutateAsync,
+    isUpdating: updateConfigMutation.isPending,
+
+    saveRawSettings: saveRawSettingsMutation.mutate,
+    saveRawSettingsAsync: saveRawSettingsMutation.mutateAsync,
+    isSavingRawSettings: saveRawSettingsMutation.isPending,
+
+    startAuth: startAuthMutation.mutate,
+    startAuthAsync: startAuthMutation.mutateAsync,
+    isAuthenticating: startAuthMutation.isPending,
+    authResult: startAuthMutation.data,
+
+    startDaemon: startDaemonMutation.mutate,
+    isStartingDaemon: startDaemonMutation.isPending,
+
+    stopDaemon: stopDaemonMutation.mutate,
+    isStoppingDaemon: stopDaemonMutation.isPending,
+
+    // Install
+    info: infoQuery.data,
+    infoLoading: infoQuery.isLoading,
+    refetchInfo: infoQuery.refetch,
+
+    install: installMutation.mutate,
+    installAsync: installMutation.mutateAsync,
+    isInstalling: installMutation.isPending,
+  };
+}
diff --git a/ui/src/pages/copilot.tsx b/ui/src/pages/copilot.tsx
new file mode 100644
index 00000000..97c6d3f1
--- /dev/null
+++ b/ui/src/pages/copilot.tsx
@@ -0,0 +1,295 @@
+/**
+ * Copilot Page - Master-Detail Layout
+ * Left sidebar: Status overview + Quick actions
+ * Right panel: Split-view configuration form (matches CLIProxy design)
+ */
+
+import { Button } from '@/components/ui/button';
+import { ScrollArea } from '@/components/ui/scroll-area';
+import { Skeleton } from '@/components/ui/skeleton';
+import {
+  Github,
+  CheckCircle2,
+  XCircle,
+  AlertTriangle,
+  RefreshCw,
+  Power,
+  PowerOff,
+  Key,
+  Server,
+  Cpu,
+  Download,
+  Loader2,
+} from 'lucide-react';
+import { useCopilot } from '@/hooks/use-copilot';
+import { CopilotConfigForm } from '@/components/copilot/copilot-config-form';
+import { cn } from '@/lib/utils';
+
+// Status section component
+function StatusSection({ title, children }: { title: string; children: React.ReactNode }) {
+  return (
+    <div className="space-y-2">
+      <div className="text-xs font-medium text-muted-foreground uppercase tracking-wide px-3">
+        {title}
+      </div>
+      <div className="space-y-1">{children}</div>
+    </div>
+  );
+}
+
+// Status item component
+function StatusItem({
+  icon: Icon,
+  label,
+  status,
+  statusText,
+  variant = 'default',
+}: {
+  icon: React.ElementType;
+  label: string;
+  status: boolean;
+  statusText?: string;
+  variant?: 'default' | 'warning';
+}) {
+  return (
+    <div className="flex items-center gap-3 px-3 py-2 rounded-lg bg-muted/50">
+      <Icon className="w-4 h-4 text-muted-foreground shrink-0" />
+      <div className="flex-1 min-w-0">
+        <span className="text-sm">{label}</span>
+      </div>
+      <div className="flex items-center gap-1.5">
+        {status ? (
+          <>
+            <CheckCircle2
+              className={cn(
+                'w-4 h-4',
+                variant === 'warning' ? 'text-yellow-500' : 'text-green-500'
+              )}
+            />
+            <span
+              className={cn(
+                'text-xs',
+                variant === 'warning' ? 'text-yellow-500' : 'text-green-500'
+              )}
+            >
+              {statusText || 'Yes'}
+            </span>
+          </>
+        ) : (
+          <>
+            <XCircle className="w-4 h-4 text-muted-foreground" />
+            <span className="text-xs text-muted-foreground">{statusText || 'No'}</span>
+          </>
+        )}
+      </div>
+    </div>
+  );
+}
+
+// Empty state when loading
+function LoadingSidebar() {
+  return (
+    <div className="space-y-4 p-4">
+      <Skeleton className="h-8 w-full" />
+      <Skeleton className="h-12 w-full" />
+      <Skeleton className="h-12 w-full" />
+      <Skeleton className="h-12 w-full" />
+    </div>
+  );
+}
+
+export function CopilotPage() {
+  const {
+    status,
+    statusLoading,
+    refetchStatus,
+    startAuth,
+    isAuthenticating,
+    startDaemon,
+    isStartingDaemon,
+    stopDaemon,
+    isStoppingDaemon,
+    install,
+    isInstalling,
+  } = useCopilot();
+
+  return (
+    <div className="h-[calc(100vh-100px)] flex">
+      {/* Left Sidebar - Status Overview */}
+      <div className="w-80 border-r flex flex-col bg-muted/30 shrink-0">
+        {/* Header */}
+        <div className="p-4 border-b bg-background">
+          <div className="flex items-center justify-between mb-1">
+            <div className="flex items-center gap-2">
+              <Github className="w-5 h-5 text-primary" />
+              <h1 className="font-semibold">Copilot</h1>
+            </div>
+            <Button
+              variant="ghost"
+              size="icon"
+              className="h-8 w-8"
+              onClick={() => refetchStatus()}
+              disabled={statusLoading}
+            >
+              <RefreshCw className={cn('w-4 h-4', statusLoading && 'animate-spin')} />
+            </Button>
+          </div>
+          <p className="text-xs text-muted-foreground">GitHub Copilot proxy</p>
+        </div>
+
+        {/* Status Overview */}
+        <ScrollArea className="flex-1">
+          {statusLoading ? (
+            <LoadingSidebar />
+          ) : (
+            <div className="p-3 space-y-4">
+              {/* Warning Banner - Disclaimer */}
+              <div className="rounded-md border border-yellow-500/50 bg-yellow-500/15 p-3 space-y-1.5">
+                <div className="flex items-center gap-2">
+                  <AlertTriangle className="h-4 w-4 text-yellow-600 dark:text-yellow-400 shrink-0" />
+                  <span className="text-xs font-semibold text-yellow-800 dark:text-yellow-200">
+                    Unofficial API - Use at Your Own Risk
+                  </span>
+                </div>
+                <ul className="text-[11px] text-yellow-700 dark:text-yellow-300 space-y-0.5 pl-6 list-disc">
+                  <li>Reverse-engineered API - may break anytime</li>
+                  <li>Excessive use may trigger account restrictions</li>
+                  <li>No warranty, no responsibility from CCS</li>
+                </ul>
+              </div>
+
+              {/* Setup - Binary first, then enabled status */}
+              <StatusSection title="Setup">
+                <StatusItem
+                  icon={Server}
+                  label="copilot-api"
+                  status={status?.installed ?? false}
+                  statusText={
+                    status?.installed
+                      ? status.version
+                        ? `v${status.version}`
+                        : 'Installed'
+                      : 'Missing'
+                  }
+                />
+                {!status?.installed && (
+                  <Button
+                    size="sm"
+                    className="w-full mt-2"
+                    onClick={() => install(undefined)}
+                    disabled={isInstalling}
+                  >
+                    {isInstalling ? (
+                      <>
+                        <Loader2 className="w-3.5 h-3.5 mr-1.5 animate-spin" />
+                        Installing...
+                      </>
+                    ) : (
+                      <>
+                        <Download className="w-3.5 h-3.5 mr-1.5" />
+                        Install copilot-api
+                      </>
+                    )}
+                  </Button>
+                )}
+                {status?.installed && (
+                  <StatusItem
+                    icon={Power}
+                    label="Integration"
+                    status={status?.enabled ?? false}
+                    statusText={status?.enabled ? 'Enabled' : 'Disabled'}
+                  />
+                )}
+              </StatusSection>
+
+              {/* Authentication - only show after binary installed */}
+              {status?.installed && (
+                <StatusSection title="Auth">
+                  <StatusItem
+                    icon={Key}
+                    label="GitHub"
+                    status={status?.authenticated ?? false}
+                    statusText={status?.authenticated ? 'Connected' : 'Not Connected'}
+                  />
+                  {!status?.authenticated && (
+                    <Button
+                      size="sm"
+                      className="w-full mt-2"
+                      onClick={() => startAuth()}
+                      disabled={isAuthenticating}
+                    >
+                      {isAuthenticating ? 'Authenticating...' : 'Authenticate'}
+                    </Button>
+                  )}
+                </StatusSection>
+              )}
+
+              {/* Daemon - only show after authenticated */}
+              {status?.authenticated && (
+                <StatusSection title="Daemon">
+                  <StatusItem
+                    icon={Cpu}
+                    label="Status"
+                    status={status?.daemon_running ?? false}
+                    statusText={status?.daemon_running ? 'Running' : 'Stopped'}
+                  />
+                  <div className="px-3 py-1 text-xs text-muted-foreground">
+                    Port: {status?.port ?? 4141}
+                  </div>
+                  <div className="px-1">
+                    {status?.daemon_running ? (
+                      <Button
+                        size="sm"
+                        variant="outline"
+                        className="w-full"
+                        onClick={() => stopDaemon()}
+                        disabled={isStoppingDaemon}
+                      >
+                        <PowerOff className="w-3.5 h-3.5 mr-1.5" />
+                        {isStoppingDaemon ? 'Stopping...' : 'Stop'}
+                      </Button>
+                    ) : (
+                      <Button
+                        size="sm"
+                        variant="outline"
+                        className="w-full"
+                        onClick={() => startDaemon()}
+                        disabled={isStartingDaemon}
+                      >
+                        <Power className="w-3.5 h-3.5 mr-1.5" />
+                        {isStartingDaemon ? 'Starting...' : 'Start'}
+                      </Button>
+                    )}
+                  </div>
+                </StatusSection>
+              )}
+            </div>
+          )}
+        </ScrollArea>
+
+        {/* Footer */}
+        <div className="p-3 border-t bg-background text-xs text-muted-foreground">
+          <div className="flex items-center justify-between">
+            <span>Proxy</span>
+            {status?.daemon_running ? (
+              <span className="flex items-center gap-1">
+                <CheckCircle2 className="w-3 h-3 text-green-500" />
+                Active
+              </span>
+            ) : (
+              <span className="flex items-center gap-1">
+                <XCircle className="w-3 h-3 text-muted-foreground" />
+                Inactive
+              </span>
+            )}
+          </div>
+        </div>
+      </div>
+
+      {/* Right Panel - Split-view Configuration Form */}
+      <div className="flex-1 flex flex-col min-w-0 bg-background overflow-hidden">
+        <CopilotConfigForm />
+      </div>
+    </div>
+  );
+}