diff --git a/src/ccs.ts b/src/ccs.ts
index 6b412371..9ae26160 100644
--- a/src/ccs.ts
+++ b/src/ccs.ts
@@ -95,6 +95,7 @@ interface RuntimeReasoningResolution {
 }
 
 const CODEX_RUNTIME_REASONING_LEVELS = new Set(['minimal', 'low', 'medium', 'high', 'xhigh']);
+const CODEX_NATIVE_PASSTHROUGH_FLAGS = new Set(['--help', '-h', '--version', '-v']);
 
 /**
  * Smart profile detection
@@ -239,6 +240,47 @@ function resolveNativeClaudeLaunchArgs(
   return buildOfficialChannelsArgs(args, plan.appliedChannels, plan.wantsPermissionBypass);
 }
 
+function shouldPassthroughNativeCodexFlagCommand(args: string[]): boolean {
+  const targetArgs = stripTargetFlag(args);
+  if (targetArgs.length === 0) {
+    return false;
+  }
+
+  return (
+    resolveTargetType(args) === 'codex' && CODEX_NATIVE_PASSTHROUGH_FLAGS.has(targetArgs[0] || '')
+  );
+}
+
+function execNativeCodexFlagCommand(args: string[]): void {
+  const adapter = getTarget('codex');
+  if (!adapter) {
+    console.error(fail('Target adapter not found for "codex"'));
+    process.exit(1);
+  }
+
+  const binaryInfo = adapter.detectBinary();
+  if (!binaryInfo) {
+    console.error(fail('Codex CLI not found.'));
+    console.error(info('Install a recent @openai/codex build, then retry.'));
+    process.exit(1);
+  }
+
+  const targetArgs = stripTargetFlag(args);
+  const creds: TargetCredentials = {
+    profile: 'default',
+    baseUrl: '',
+    apiKey: '',
+  };
+
+  const builtArgs = adapter.buildArgs('default', targetArgs, {
+    creds,
+    profileType: 'default',
+    binaryInfo,
+  });
+  const targetEnv = adapter.buildEnv(creds, 'default');
+  adapter.exec(builtArgs, targetEnv, { binaryInfo });
+}
+
 async function main(): Promise<void> {
   // Register target adapters
   registerTarget(new ClaudeAdapter());
@@ -315,6 +357,11 @@ async function main(): Promise<void> {
     }
   }
 
+  if (shouldPassthroughNativeCodexFlagCommand(args)) {
+    execNativeCodexFlagCommand(args);
+    return;
+  }
+
   const firstArg = args[0];
 
   // Trigger update check early for ALL commands except version/help/update
diff --git a/src/targets/codex-adapter.ts b/src/targets/codex-adapter.ts
index 859ec7d3..b2e6f774 100644
--- a/src/targets/codex-adapter.ts
+++ b/src/targets/codex-adapter.ts
@@ -3,7 +3,7 @@ import * as fs from 'fs';
 import type { ProfileType } from '../types/profile';
 import { runCleanup } from '../errors';
 import { wireChildProcessSignals } from '../utils/signal-forwarder';
-import { escapeShellArg, stripAnthropicEnv } from '../utils/shell-executor';
+import { escapeShellArg, stripAnthropicEnv, stripCodexSessionEnv } from '../utils/shell-executor';
 import type {
   TargetAdapter,
   TargetBinaryInfo,
@@ -76,7 +76,7 @@ export class CodexAdapter implements TargetAdapter {
   readonly displayName = 'Codex CLI';
 
   detectBinary(): TargetBinaryInfo | null {
-    return getCodexBinaryInfo();
+    return getCodexBinaryInfo({ includeVersion: false, includeFeatures: false });
   }
 
   async prepareCredentials(_creds: TargetCredentials): Promise<void> {
@@ -148,7 +148,9 @@ export class CodexAdapter implements TargetAdapter {
   }
 
   buildEnv(creds: TargetCredentials, profileType: ProfileType): NodeJS.ProcessEnv {
-    const env: NodeJS.ProcessEnv = { ...stripAnthropicEnv(process.env) };
+    const env: NodeJS.ProcessEnv = {
+      ...stripCodexSessionEnv(stripAnthropicEnv(process.env)),
+    };
     delete env[CODEX_RUNTIME_ENV_KEY];
     if (profileType !== 'default') {
       if (!creds.apiKey?.trim()) {
diff --git a/src/targets/codex-detector.ts b/src/targets/codex-detector.ts
index 07b1a7a5..56cfb79b 100644
--- a/src/targets/codex-detector.ts
+++ b/src/targets/codex-detector.ts
@@ -118,7 +118,10 @@ export function detectCodexCli(): string | null {
   return null;
 }
 
-export function getCodexBinaryInfo(): TargetBinaryInfo | null {
+export function getCodexBinaryInfo(options?: {
+  includeVersion?: boolean;
+  includeFeatures?: boolean;
+}): TargetBinaryInfo | null {
   const codexPath = detectCodexCli();
   if (!codexPath) return null;
 
@@ -126,13 +129,21 @@ export function getCodexBinaryInfo(): TargetBinaryInfo | null {
   return {
     path: codexPath,
     needsShell: isWindows && /\.(cmd|bat|ps1)$/i.test(codexPath),
-    version: readCodexVersion(codexPath),
-    features: detectCodexFeatures(codexPath),
+    version: options?.includeVersion === false ? undefined : readCodexVersion(codexPath),
+    features: options?.includeFeatures === false ? undefined : detectCodexFeatures(codexPath),
   };
 }
 
 export function codexBinarySupportsConfigOverrides(
   binaryInfo: TargetBinaryInfo | null | undefined
 ): boolean {
-  return Boolean(binaryInfo?.features?.includes(CODEX_CONFIG_OVERRIDE_FEATURE));
+  if (!binaryInfo) {
+    return false;
+  }
+
+  if (binaryInfo.features) {
+    return binaryInfo.features.includes(CODEX_CONFIG_OVERRIDE_FEATURE);
+  }
+
+  return detectCodexFeatures(binaryInfo.path).includes(CODEX_CONFIG_OVERRIDE_FEATURE);
 }
diff --git a/src/utils/shell-executor.ts b/src/utils/shell-executor.ts
index ff96458e..6d90c428 100644
--- a/src/utils/shell-executor.ts
+++ b/src/utils/shell-executor.ts
@@ -42,6 +42,25 @@ export function stripClaudeCodeEnv(env: NodeJS.ProcessEnv): NodeJS.ProcessEnv {
   return result;
 }
 
+/**
+ * Strip Codex session-scoped env vars before launching a nested Codex process.
+ *
+ * Keep real user config such as CODEX_HOME intact. Only remove the known
+ * session/runtime metadata exported by the current Codex host process.
+ */
+export function stripCodexSessionEnv(env: NodeJS.ProcessEnv): NodeJS.ProcessEnv {
+  const sessionKeys = new Set(['CODEX_CI', 'CODEX_MANAGED_BY_BUN', 'CODEX_THREAD_ID']);
+  const result: NodeJS.ProcessEnv = {};
+  for (const key of Object.keys(env)) {
+    const upperKey = key.toUpperCase();
+    if (sessionKeys.has(upperKey)) {
+      continue;
+    }
+    result[key] = env[key];
+  }
+  return result;
+}
+
 /**
  * Resolve CCS-managed environment overrides for Claude launch.
  * - preferences.auto_update: false -> DISABLE_AUTOUPDATER=1
diff --git a/tests/unit/targets/codex-adapter.test.ts b/tests/unit/targets/codex-adapter.test.ts
index 57214f77..0feaa191 100644
--- a/tests/unit/targets/codex-adapter.test.ts
+++ b/tests/unit/targets/codex-adapter.test.ts
@@ -165,24 +165,65 @@ describe('CodexAdapter', () => {
   });
 
   test('injects CCS_CODEX_API_KEY for CCS-backed launches only', () => {
-    const settingsEnv = adapter.buildEnv(
-      {
-        profile: 'codex',
-        baseUrl: 'http://127.0.0.1:8317/api/provider/codex',
-        apiKey: 'cliproxy-token',
-      },
-      'cliproxy'
-    );
-    expect(settingsEnv.CCS_CODEX_API_KEY).toBe('cliproxy-token');
+    const originalCodeXHome = process.env.CODEX_HOME;
+    const originalCodeXCi = process.env.CODEX_CI;
+    const originalCodeXThreadId = process.env.CODEX_THREAD_ID;
+    const originalAnthropicBaseUrl = process.env.ANTHROPIC_BASE_URL;
 
-    const defaultEnv = adapter.buildEnv(
-      {
-        profile: 'default',
-        baseUrl: '',
-        apiKey: '',
-      },
-      'default'
-    );
-    expect(defaultEnv.CCS_CODEX_API_KEY).toBeUndefined();
+    try {
+      process.env.CODEX_HOME = '/tmp/codex-home';
+      process.env.CODEX_CI = '1';
+      process.env.CODEX_THREAD_ID = 'thread-123';
+      process.env.ANTHROPIC_BASE_URL = 'https://stale-proxy.invalid';
+
+      const settingsEnv = adapter.buildEnv(
+        {
+          profile: 'codex',
+          baseUrl: 'http://127.0.0.1:8317/api/provider/codex',
+          apiKey: 'cliproxy-token',
+        },
+        'cliproxy'
+      );
+      expect(settingsEnv.CCS_CODEX_API_KEY).toBe('cliproxy-token');
+      expect(settingsEnv.CODEX_HOME).toBe('/tmp/codex-home');
+      expect(settingsEnv.CODEX_CI).toBeUndefined();
+      expect(settingsEnv.CODEX_THREAD_ID).toBeUndefined();
+      expect(settingsEnv.ANTHROPIC_BASE_URL).toBeUndefined();
+
+      const defaultEnv = adapter.buildEnv(
+        {
+          profile: 'default',
+          baseUrl: '',
+          apiKey: '',
+        },
+        'default'
+      );
+      expect(defaultEnv.CCS_CODEX_API_KEY).toBeUndefined();
+      expect(defaultEnv.CODEX_HOME).toBe('/tmp/codex-home');
+      expect(defaultEnv.CODEX_CI).toBeUndefined();
+      expect(defaultEnv.CODEX_THREAD_ID).toBeUndefined();
+      expect(defaultEnv.ANTHROPIC_BASE_URL).toBeUndefined();
+    } finally {
+      if (originalCodeXHome === undefined) {
+        delete process.env.CODEX_HOME;
+      } else {
+        process.env.CODEX_HOME = originalCodeXHome;
+      }
+      if (originalCodeXCi === undefined) {
+        delete process.env.CODEX_CI;
+      } else {
+        process.env.CODEX_CI = originalCodeXCi;
+      }
+      if (originalCodeXThreadId === undefined) {
+        delete process.env.CODEX_THREAD_ID;
+      } else {
+        process.env.CODEX_THREAD_ID = originalCodeXThreadId;
+      }
+      if (originalAnthropicBaseUrl === undefined) {
+        delete process.env.ANTHROPIC_BASE_URL;
+      } else {
+        process.env.ANTHROPIC_BASE_URL = originalAnthropicBaseUrl;
+      }
+    }
   });
 });
diff --git a/tests/unit/targets/codex-runtime-integration.test.ts b/tests/unit/targets/codex-runtime-integration.test.ts
index f7e0e2c0..098a2924 100644
--- a/tests/unit/targets/codex-runtime-integration.test.ts
+++ b/tests/unit/targets/codex-runtime-integration.test.ts
@@ -25,6 +25,21 @@ function runCcs(args: string[], env: NodeJS.ProcessEnv): RunResult {
   };
 }
 
+function runCodexAlias(args: string[], env: NodeJS.ProcessEnv): RunResult {
+  const codexEntry = path.join(process.cwd(), 'src', 'bin', 'codex-runtime.ts');
+  const result = spawnSync(process.execPath, [codexEntry, ...args], {
+    encoding: 'utf8',
+    env,
+    timeout: 20000,
+  });
+
+  return {
+    status: result.status,
+    stdout: result.stdout || '',
+    stderr: result.stderr || '',
+  };
+}
+
 function readLoggedCodexCalls(logPath: string): string[][] {
   if (!fs.existsSync(logPath)) {
     return [];
@@ -93,7 +108,7 @@ process.exit(0);
     fs.rmSync(tmpHome, { recursive: true, force: true });
   });
 
-  it('ignores numeric CCS_THINKING env overrides for native Codex default mode', () => {
+  it('does not preflight native Codex default launches when no runtime overrides are needed', () => {
     if (process.platform === 'win32') return;
 
     const result = runCcs(['default', '--target', 'codex', 'fix failing tests'], {
@@ -108,7 +123,7 @@ process.exit(0);
 
     expect(result.status).toBe(0);
     const calls = readLoggedCodexCalls(codexArgsLogPath);
-    expect(calls.at(-1)).toEqual(['fix failing tests']);
+    expect(calls).toEqual([['fix failing tests']]);
   });
 
   it('ignores off-style CCS_THINKING env overrides for native Codex default mode', () => {
@@ -126,7 +141,25 @@ process.exit(0);
 
     expect(result.status).toBe(0);
     const calls = readLoggedCodexCalls(codexArgsLogPath);
-    expect(calls.at(-1)).toEqual(['fix failing tests']);
+    expect(calls).toEqual([['fix failing tests']]);
+  });
+
+  it('passes ccsx --version straight through to the native Codex binary', () => {
+    if (process.platform === 'win32') return;
+
+    const result = runCodexAlias(['--version'], {
+      ...process.env,
+      CI: '1',
+      NO_COLOR: '1',
+      CCS_HOME: tmpHome,
+      CCS_CODEX_PATH: fakeCodexPath,
+      CCS_TEST_CODEX_ARGS_OUT: codexArgsLogPath,
+      CCS_TEST_CODEX_VERSION: 'codex-cli 9.9.9-test',
+    });
+
+    expect(result.status).toBe(0);
+    expect(result.stdout).toContain('codex-cli 9.9.9-test');
+    expect(readLoggedCodexCalls(codexArgsLogPath)).toEqual([['--version']]);
   });
 
   it('fails fast when native Codex reasoning overrides need unsupported --config support', () => {
@@ -145,7 +178,7 @@ process.exit(0);
     expect(result.status).toBe(1);
     expect(result.stderr).toContain('does not advertise --config overrides');
     const calls = readLoggedCodexCalls(codexArgsLogPath);
-    expect(calls).toEqual([['--version'], ['--help']]);
+    expect(calls).toEqual([['--help']]);
   });
 
   it('reports unsupported generic settings profiles before Codex install guidance', () => {