feat(copilot): add complete model catalog with plan tiers

Add 19 GitHub Copilot supported models with metadata:
- Anthropic: claude-sonnet-4.5, claude-sonnet-4, claude-opus-4.5,
  claude-opus-4.1, claude-haiku-4.5
- OpenAI: gpt-5.2, gpt-5.1-codex-max, gpt-5.1-codex, gpt-5.1-codex-mini,
  gpt-5.1, gpt-5-codex, gpt-5, gpt-5-mini, gpt-4.1
- Google: gemini-3-pro, gemini-3-flash, gemini-2.5-pro
- xAI: grok-code-fast-1
- Fine-tuned: raptor-mini

Each model includes:
- minPlan: free, pro, pro+, business, enterprise
- multiplier: 0 = free tier, 0.25-0.33 = cheap, 1 = standard, 3-10 = premium
- preview: boolean for non-GA models

Update default model to claude-sonnet-4.5 (standard multiplier).

src/config/unified-config-loader.ts

@@ -325,7 +325,7 @@ function generateYamlWithComments(config: UnifiedConfig): string {
     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-opus-4-5-20250514, claude-sonnet-4-20250514, gpt-4.1, o3');
+    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(

src/config/unified-config-types.ts

@@ -175,7 +175,7 @@ export interface CopilotConfig {
   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-opus-4-5-20250514) */
+  /** 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;
@@ -259,7 +259,7 @@ export const DEFAULT_COPILOT_CONFIG: CopilotConfig = {
   account_type: 'individual',
   rate_limit: null,
   wait_on_limit: true,
-  model: 'claude-opus-4-5-20250514',
+  model: 'claude-sonnet-4.5',
 };
 
 /**

src/copilot/copilot-models.ts

@@ -2,6 +2,8 @@
  * 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';
@@ -10,19 +12,132 @@ 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
   {
-    id: 'claude-opus-4-5-20250514',
+    id: 'claude-sonnet-4.5',
-    name: 'Claude Opus 4.5',
+    name: 'Claude Sonnet 4.5',
     provider: 'anthropic',
     isDefault: true,
+    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: 'free',
+    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', 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,
   },
-  { id: 'claude-sonnet-4-20250514', name: 'Claude Sonnet 4', provider: 'anthropic' },
-  { id: 'gpt-4.1', name: 'GPT-4.1', provider: 'openai' },
-  { id: 'gpt-4.1-mini', name: 'GPT-4.1 Mini', provider: 'openai' },
-  { id: 'o3', name: 'O3', provider: 'openai' },
-  { id: 'o4-mini', name: 'O4 Mini', provider: 'openai' },
 ];
 
 /**
@@ -55,8 +170,8 @@ export async function fetchModelsFromDaemon(port: number): Promise<CopilotModel[
               const models: CopilotModel[] = response.data.map((m) => ({
                 id: m.id,
                 name: formatModelName(m.id),
-                provider: m.id.includes('claude') ? 'anthropic' : 'openai',
+                provider: detectProvider(m.id),
-                isDefault: m.id === 'claude-opus-4-5-20250514',
+                isDefault: m.id === 'claude-sonnet-4.5',
               }));
               resolve(models.length > 0 ? models : DEFAULT_COPILOT_MODELS);
             } else {
@@ -93,22 +208,33 @@ export async function getAvailableModels(port: number): Promise<CopilotModel[]>
  * Get the default model.
  */
 export function getDefaultModel(): string {
-  return 'claude-opus-4-5-20250514';
+  return 'claude-sonnet-4.5';
+}
+
+/**
+ * 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 {
-  // Convert model IDs to readable names
+  // Find model in catalog for metadata
-  const nameMap: Record<string, string> = {
+  const model = DEFAULT_COPILOT_MODELS.find((m) => m.id === modelId);
-    'claude-opus-4-5-20250514': 'Claude Opus 4.5',
+  if (model) {
-    'claude-sonnet-4-20250514': 'Claude Sonnet 4',
+    let name = model.name;
-    'gpt-4.1': 'GPT-4.1',
+    if (model.preview) name += ' (Preview)';
-    'gpt-4.1-mini': 'GPT-4.1 Mini',
+    return name;
-    o3: 'O3',
+  }
-    'o4-mini': 'O4 Mini',
-  };
 
-  return nameMap[modelId] || modelId;
+  // Fallback: convert kebab-case to title case
+  return modelId
+    .split('-')
+    .map((word) => word.charAt(0).toUpperCase() + word.slice(1))
+    .join(' ');
 }

src/copilot/types.ts

@@ -35,6 +35,12 @@ export interface CopilotStatus {
   daemon: CopilotDaemonStatus;
 }
 
+/**
+ * Copilot plan tier for model availability.
+ * Based on GitHub Copilot plans.
+ */
+export type CopilotPlanTier = 'free' | 'pro' | 'pro+' | 'business' | 'enterprise';
+
 /**
  * Copilot model information.
  */
@@ -45,6 +51,12 @@ export interface CopilotModel {
   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;
 }
 
 /**