diff --git a/changelog.md b/changelog.md
index 100b684..ea7ebf9 100644
--- a/changelog.md
+++ b/changelog.md
@@ -2,6 +2,13 @@
 
 ## Pending
 
+### Breaking Changes
+
+- rename OpenAI ChatGPT/Codex subscription auth APIs from `OpenAiMax`/`openAiMaxAuth` to `OpenAiChatGpt`/`openAiChatGptAuth`
+
+### Features
+
+- add Node-only `@push.rocks/smartai/openai-chatgpt-auth` helpers to inspect, normalize, resolve, refresh, and write SmartAI, OpenCode, and Codex ChatGPT auth sources
 
 ## 2026-05-14 - 2.3.0
 
diff --git a/package.json b/package.json
index cab14e9..454eaff 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@push.rocks/smartai",
-  "version": "2.3.0",
+  "version": "3.0.0",
   "private": false,
   "description": "Provider registry and capability utilities for ai-sdk (Vercel AI SDK). Core export returns LanguageModel; subpath exports provide vision, audio, image, document and research capabilities.",
   "main": "dist_ts/index.js",
@@ -30,6 +30,10 @@
     "./research": {
       "import": "./dist_ts_research/index.js",
       "types": "./dist_ts_research/index.d.ts"
+    },
+    "./openai-chatgpt-auth": {
+      "import": "./dist_ts_openai_chatgpt_auth/index.js",
+      "types": "./dist_ts_openai_chatgpt_auth/index.d.ts"
     }
   },
   "author": "Task Venture Capital GmbH",
@@ -84,6 +88,7 @@
     "ts_image/**/*",
     "ts_document/**/*",
     "ts_research/**/*",
+    "ts_openai_chatgpt_auth/**/*",
     "dist_*/**/*",
     "assets/**/*",
     ".smartconfig.json",
diff --git a/readme.hints.md b/readme.hints.md
index 152aac9..5d2d377 100644
--- a/readme.hints.md
+++ b/readme.hints.md
@@ -10,7 +10,8 @@ The package is a **provider registry** built on the Vercel AI SDK (`ai` v6). The
 - Providers: anthropic, openai, google, groq, mistral, xai, perplexity, ollama
 - Anthropic prompt caching via `wrapLanguageModel` middleware (enabled by default)
 - Custom Ollama provider implementing `LanguageModelV3` directly (for think, num_ctx support)
-- OpenAI ChatGPT/Max device-code auth in `smartai.auth.openai.ts`; `openAiMaxAuth` routes OpenAI models to the ChatGPT Codex backend
+- OpenAI ChatGPT/Codex device-code auth in `smartai.auth.openai.ts`; `openAiChatGptAuth` routes OpenAI models to the ChatGPT Codex backend
+- Node-only local auth source helpers live in `ts_openai_chatgpt_auth/` and support SmartAI, OpenCode, and Codex auth file formats
 
 ### Subpath Exports
 - `@push.rocks/smartai/vision` — `analyzeImage()` using `generateText` with image content
diff --git a/readme.md b/readme.md
index e45de47..0418961 100644
--- a/readme.md
+++ b/readme.md
@@ -107,29 +107,60 @@ console.log(result.text);
 
 OpenAI `reasoningEffort` supports `'none'`, `'minimal'`, `'low'`, `'medium'`, `'high'`, and `'xhigh'`. Model IDs are accepted as strings, so new IDs like `'gpt-5.5'` can be used before upstream model unions are updated.
 
-### OpenAI Max / ChatGPT Auth
+### OpenAI ChatGPT / Codex Auth
 
-SmartAI can request ChatGPT subscription-backed Codex credentials with OpenAI's device-code flow. The returned credentials are passed to `getModel()` through `openAiMaxAuth`; SmartAI then routes OpenAI model calls through the ChatGPT Codex backend with the required account headers.
+SmartAI can request ChatGPT subscription-backed Codex credentials with OpenAI's device-code flow. The returned credentials are passed to `getModel()` through `openAiChatGptAuth`; SmartAI then routes OpenAI model calls through the ChatGPT Codex backend with the required account headers.
 
 ```typescript
 import {
-  completeOpenAiMaxDeviceCodeLogin,
+  completeOpenAiChatGptDeviceCodeLogin,
   getModel,
-  requestOpenAiMaxDeviceCode,
+  requestOpenAiChatGptDeviceCode,
 } from '@push.rocks/smartai';
 
-const deviceCode = await requestOpenAiMaxDeviceCode();
+const deviceCode = await requestOpenAiChatGptDeviceCode();
 console.log(`Open ${deviceCode.verificationUrl} and enter ${deviceCode.userCode}`);
 
-const openAiMaxAuth = await completeOpenAiMaxDeviceCodeLogin(deviceCode);
+const openAiChatGptAuth = await completeOpenAiChatGptDeviceCodeLogin(deviceCode);
 const model = getModel({
   provider: 'openai',
   model: 'gpt-5.5',
-  openAiMaxAuth,
+  openAiChatGptAuth,
 });
 ```
 
-Use `refreshOpenAiMaxTokenData(openAiMaxAuth)` before stored credentials expire, or after receiving an unauthorized response.
+Use `refreshOpenAiChatGptTokenData(openAiChatGptAuth)` before stored credentials expire, or after receiving an unauthorized response.
+
+Node.js consumers can inspect and resolve local ChatGPT auth files through the Node-only subpath. This supports SmartAI's canonical auth file, OpenCode's `~/.local/share/opencode/auth.json`, and Codex's `~/.codex/auth.json` without exposing token values in inspection results.
+
+```typescript
+import {
+  inspectOpenAiChatGptAuthSources,
+  resolveOpenAiChatGptAuth,
+} from '@push.rocks/smartai/openai-chatgpt-auth';
+
+const sources = await inspectOpenAiChatGptAuthSources({
+  sources: ['smartai', 'opencode', 'codex'],
+});
+
+const resolved = await resolveOpenAiChatGptAuth({
+  sources: ['smartai', 'opencode', 'codex'],
+  refresh: 'ifNeeded',
+  writeBack: {
+    smartai: true,
+    opencode: false,
+    codex: false,
+  },
+});
+
+if (resolved) {
+  const model = getModel({
+    provider: 'openai',
+    model: 'gpt-5.5',
+    openAiChatGptAuth: resolved.tokenData,
+  });
+}
+```
 
 ### Re-exported AI SDK Functions
 
diff --git a/test/test.openai-auth.node.ts b/test/test.openai-auth.node.ts
index e869d69..4757ab8 100644
--- a/test/test.openai-auth.node.ts
+++ b/test/test.openai-auth.node.ts
@@ -1,6 +1,15 @@
 import { tap, expect } from '@git.zone/tstest/tapbundle';
+import * as fs from 'node:fs/promises';
+import * as os from 'node:os';
+import * as path from 'node:path';
 import * as smartai from '../ts/index.js';
-import type { IOpenAiMaxTokenData } from '../ts/index.js';
+import type { IOpenAiChatGptTokenData } from '../ts/index.js';
+import {
+  inspectOpenAiChatGptAuthSources,
+  normalizeOpenAiChatGptAuth,
+  resolveOpenAiChatGptAuth,
+  writeOpenAiChatGptAuthFile,
+} from '../ts_openai_chatgpt_auth/index.js';
 
 interface IMockFetchRequest {
   url: string;
@@ -12,10 +21,10 @@ function createJwt(payload: Record<string, unknown>): string {
   return `${encode({ alg: 'none', typ: 'JWT' })}.${encode(payload)}.sig`;
 }
 
-function createTokenData(accountId = 'workspace-1'): IOpenAiMaxTokenData {
-  const idToken = createJwt({
+function createTokenData(accountId = 'workspace-1', expiresAtSeconds = 4_102_444_800): IOpenAiChatGptTokenData {
+  const accessToken = createJwt({
     email: 'user@example.com',
-    exp: 4_102_444_800,
+    exp: expiresAtSeconds,
     'https://api.openai.com/auth': {
       chatgpt_plan_type: 'pro',
       chatgpt_user_id: 'user-1',
@@ -23,13 +32,12 @@ function createTokenData(accountId = 'workspace-1'): IOpenAiMaxTokenData {
       chatgpt_account_is_fedramp: false,
     },
   });
-  const idTokenInfo = smartai.parseOpenAiMaxIdToken(idToken);
+  const tokenInfo = smartai.parseOpenAiChatGptTokenInfo(accessToken);
   return {
-    idToken,
-    accessToken: 'access-token',
+    accessToken,
     refreshToken: 'refresh-token',
     accountId,
-    idTokenInfo,
+    tokenInfo,
   };
 }
 
@@ -44,7 +52,7 @@ function getHeader(init: RequestInit | undefined, name: string): string | null {
   return new Headers(init?.headers).get(name);
 }
 
-tap.test('requestOpenAiMaxDeviceCode requests a user code', async () => {
+tap.test('requestOpenAiChatGptDeviceCode requests a user code', async () => {
   const originalFetch = globalThis.fetch;
   const requests: IMockFetchRequest[] = [];
 
@@ -58,7 +66,7 @@ tap.test('requestOpenAiMaxDeviceCode requests a user code', async () => {
   };
 
   try {
-    const deviceCode = await smartai.requestOpenAiMaxDeviceCode({
+    const deviceCode = await smartai.requestOpenAiChatGptDeviceCode({
       issuer: 'https://auth.example.test',
       clientId: 'client-1',
     });
@@ -76,7 +84,7 @@ tap.test('requestOpenAiMaxDeviceCode requests a user code', async () => {
   }
 });
 
-tap.test('completeOpenAiMaxDeviceCodeLogin polls and exchanges OAuth tokens', async () => {
+tap.test('completeOpenAiChatGptDeviceCodeLogin polls and exchanges OAuth tokens', async () => {
   const originalFetch = globalThis.fetch;
   const requests: IMockFetchRequest[] = [];
   const tokenData = createTokenData('workspace-1');
@@ -88,7 +96,6 @@ tap.test('completeOpenAiMaxDeviceCodeLogin polls and exchanges OAuth tokens', as
       code_verifier: 'verifier',
     }),
     jsonResponse({
-      id_token: tokenData.idToken,
       access_token: tokenData.accessToken,
       refresh_token: tokenData.refreshToken,
     }),
@@ -102,7 +109,7 @@ tap.test('completeOpenAiMaxDeviceCodeLogin polls and exchanges OAuth tokens', as
   };
 
   try {
-    const result = await smartai.completeOpenAiMaxDeviceCodeLogin({
+    const result = await smartai.completeOpenAiChatGptDeviceCodeLogin({
       verificationUrl: 'https://auth.example.test/codex/device',
       userCode: 'ABCD-EFGH',
       deviceAuthId: 'device-1',
@@ -114,9 +121,9 @@ tap.test('completeOpenAiMaxDeviceCodeLogin polls and exchanges OAuth tokens', as
       sleep: async () => undefined,
     });
 
-    expect(result.accessToken).toEqual('access-token');
+    expect(result.accessToken).toEqual(tokenData.accessToken);
     expect(result.refreshToken).toEqual('refresh-token');
-    expect(result.idTokenInfo.chatgptAccountId).toEqual('workspace-1');
+    expect(result.tokenInfo.chatgptAccountId).toEqual('workspace-1');
     expect(requests.length).toEqual(3);
     expect(JSON.parse(String(requests[0].init?.body))).toEqual({
       device_auth_id: 'device-1',
@@ -133,25 +140,25 @@ tap.test('completeOpenAiMaxDeviceCodeLogin polls and exchanges OAuth tokens', as
   }
 });
 
-tap.test('refreshOpenAiMaxTokenData refreshes and preserves omitted token fields', async () => {
+tap.test('refreshOpenAiChatGptTokenData refreshes and preserves omitted token fields', async () => {
   const originalFetch = globalThis.fetch;
   const requests: IMockFetchRequest[] = [];
   const tokenData = createTokenData('workspace-1');
+  const refreshedToken = createTokenData('workspace-1', 4_102_445_000).accessToken;
 
   globalThis.fetch = async (input: RequestInfo | URL, init?: RequestInit) => {
     requests.push({ url: String(input), init });
-    return jsonResponse({ access_token: 'new-access-token' });
+    return jsonResponse({ access_token: refreshedToken });
   };
 
   try {
-    const result = await smartai.refreshOpenAiMaxTokenData(tokenData, {
+    const result = await smartai.refreshOpenAiChatGptTokenData(tokenData, {
       issuer: 'https://auth.example.test',
       clientId: 'client-1',
     });
 
-    expect(result.accessToken).toEqual('new-access-token');
+    expect(result.accessToken).toEqual(refreshedToken);
     expect(result.refreshToken).toEqual('refresh-token');
-    expect(result.idToken).toEqual(tokenData.idToken);
     expect(JSON.parse(String(requests[0].init?.body))).toEqual({
       client_id: 'client-1',
       grant_type: 'refresh_token',
@@ -162,14 +169,14 @@ tap.test('refreshOpenAiMaxTokenData refreshes and preserves omitted token fields
   }
 });
 
-tap.test('getModel uses ChatGPT Codex backend for OpenAI Max auth', async () => {
+tap.test('getModel uses ChatGPT Codex backend for OpenAI ChatGPT auth', async () => {
   const originalFetch = globalThis.fetch;
   let capturedRequest: IMockFetchRequest | undefined;
   const tokenData = createTokenData('workspace-1');
   const model = smartai.getModel({
     provider: 'openai',
     model: 'gpt-5.5',
-    openAiMaxAuth: tokenData,
+    openAiChatGptAuth: tokenData,
   });
 
   globalThis.fetch = async (input: RequestInfo | URL, init?: RequestInit) => {
@@ -198,7 +205,7 @@ tap.test('getModel uses ChatGPT Codex backend for OpenAI Max auth', async () =>
     } as any);
 
     expect(capturedRequest?.url).toEqual('https://chatgpt.com/backend-api/codex/responses');
-    expect(getHeader(capturedRequest?.init, 'authorization')).toEqual('Bearer access-token');
+    expect(getHeader(capturedRequest?.init, 'authorization')).toEqual(`Bearer ${tokenData.accessToken}`);
     expect(getHeader(capturedRequest?.init, 'chatgpt-account-id')).toEqual('workspace-1');
     expect(getHeader(capturedRequest?.init, 'originator')).toEqual('smartai');
   } finally {
@@ -206,4 +213,81 @@ tap.test('getModel uses ChatGPT Codex backend for OpenAI Max auth', async () =>
   }
 });
 
+tap.test('normalizes OpenCode and Codex auth file formats', async () => {
+  const tokenData = createTokenData('workspace-2');
+  const opencodeAuth = normalizeOpenAiChatGptAuth({
+    openai: {
+      type: 'oauth',
+      access: tokenData.accessToken,
+      refresh: tokenData.refreshToken,
+      expires: Date.parse(tokenData.tokenInfo.expiresAt!),
+      accountId: 'workspace-2',
+    },
+  }, 'opencode');
+  const codexAuth = normalizeOpenAiChatGptAuth({
+    tokens: {
+      access_token: tokenData.accessToken,
+      refresh_token: tokenData.refreshToken,
+      account_id: 'workspace-2',
+    },
+  }, 'codex');
+
+  expect(opencodeAuth?.accountId).toEqual('workspace-2');
+  expect(opencodeAuth?.tokenInfo.chatgptAccountId).toEqual('workspace-2');
+  expect(codexAuth?.accountId).toEqual('workspace-2');
+  expect(codexAuth?.tokenInfo.chatgptAccountId).toEqual('workspace-2');
+});
+
+tap.test('inspects and resolves OpenAI ChatGPT auth sources without exposing tokens', async () => {
+  const tempDir = await fs.mkdtemp(path.join(os.tmpdir(), 'smartai-auth-sources-'));
+  try {
+    const tokenData = createTokenData('workspace-3');
+    const opencodePath = path.join(tempDir, 'opencode-auth.json');
+    await fs.writeFile(opencodePath, JSON.stringify({
+      openai: {
+        type: 'oauth',
+        access: tokenData.accessToken,
+        refresh: tokenData.refreshToken,
+        expires: Date.parse(tokenData.tokenInfo.expiresAt!),
+        accountId: 'workspace-3',
+      },
+      anthropic: { type: 'oauth', access: 'keep-me' },
+    }));
+
+    const inspections = await inspectOpenAiChatGptAuthSources({
+      sources: [{ source: 'opencode', filePath: opencodePath }],
+    });
+    const resolved = await resolveOpenAiChatGptAuth({
+      sources: [{ source: 'opencode', filePath: opencodePath }],
+    });
+
+    expect(inspections).toHaveLength(1);
+    expect(inspections[0]!.usable).toEqual(true);
+    expect(JSON.stringify(inspections)).not.toInclude(tokenData.accessToken);
+    expect(resolved?.source).toEqual('opencode');
+    expect(resolved?.tokenData.accountId).toEqual('workspace-3');
+  } finally {
+    await fs.rm(tempDir, { recursive: true, force: true });
+  }
+});
+
+tap.test('writes OpenCode auth while preserving unrelated providers', async () => {
+  const tempDir = await fs.mkdtemp(path.join(os.tmpdir(), 'smartai-opencode-write-'));
+  try {
+    const tokenData = createTokenData('workspace-4');
+    const opencodePath = path.join(tempDir, 'auth.json');
+    await fs.writeFile(opencodePath, JSON.stringify({ anthropic: { type: 'oauth', access: 'keep-me' } }));
+
+    await writeOpenAiChatGptAuthFile(opencodePath, tokenData, 'opencode');
+    const written = JSON.parse(await fs.readFile(opencodePath, 'utf8')) as any;
+
+    expect(written.anthropic.access).toEqual('keep-me');
+    expect(written.openai.type).toEqual('oauth');
+    expect(written.openai.accountId).toEqual('workspace-4');
+    expect(written.openai.access).toEqual(tokenData.accessToken);
+  } finally {
+    await fs.rm(tempDir, { recursive: true, force: true });
+  }
+});
+
 export default tap.start();
diff --git a/ts/index.ts b/ts/index.ts
index 9f49767..bccd323 100644
--- a/ts/index.ts
+++ b/ts/index.ts
@@ -1,13 +1,13 @@
 export { getModel, getModelSetup } from './smartai.classes.smartai.js';
 export type {
   IOpenAiProviderOptions,
-  IOpenAiMaxAuthCredentials,
-  IOpenAiMaxAuthOptions,
-  IOpenAiMaxCompleteDeviceCodeOptions,
-  IOpenAiMaxDeviceCode,
-  IOpenAiMaxDeviceCodePollOptions,
-  IOpenAiMaxIdTokenInfo,
-  IOpenAiMaxTokenData,
+  IOpenAiChatGptAuthCredentials,
+  IOpenAiChatGptAuthOptions,
+  IOpenAiChatGptCompleteDeviceCodeOptions,
+  IOpenAiChatGptDeviceCode,
+  IOpenAiChatGptDeviceCodePollOptions,
+  IOpenAiChatGptTokenData,
+  IOpenAiChatGptTokenInfo,
   ISmartAiModelSetup,
   ISmartAiOptions,
   TOpenAiReasoningEffort,
@@ -36,21 +36,21 @@ export type {
 } from './smartai.cache.js';
 export { createOllamaModel } from './smartai.provider.ollama.js';
 export {
-  OPENAI_MAX_AUTH_ISSUER,
-  OPENAI_MAX_CLIENT_ID,
-  OPENAI_MAX_CODEX_BASE_URL,
-  OPENAI_MAX_DEFAULT_ORIGINATOR,
-  OpenAiMaxAuthError,
-  completeOpenAiMaxDeviceCodeLogin,
-  createOpenAiMaxProviderSettings,
-  ensureOpenAiMaxWorkspaceAllowed,
-  exchangeOpenAiMaxAuthorizationCode,
-  parseOpenAiMaxIdToken,
-  pollOpenAiMaxDeviceCode,
-  refreshOpenAiMaxTokenData,
-  requestOpenAiMaxDeviceCode,
+  OPENAI_CHATGPT_AUTH_ISSUER,
+  OPENAI_CHATGPT_CLIENT_ID,
+  OPENAI_CHATGPT_CODEX_BASE_URL,
+  OPENAI_CHATGPT_DEFAULT_ORIGINATOR,
+  OpenAiChatGptAuthError,
+  completeOpenAiChatGptDeviceCodeLogin,
+  createOpenAiChatGptProviderSettings,
+  ensureOpenAiChatGptWorkspaceAllowed,
+  exchangeOpenAiChatGptAuthorizationCode,
+  parseOpenAiChatGptTokenInfo,
+  pollOpenAiChatGptDeviceCode,
+  refreshOpenAiChatGptTokenData,
+  requestOpenAiChatGptDeviceCode,
 } from './smartai.auth.openai.js';
-export type { IOpenAiMaxAuthorizationCode } from './smartai.auth.openai.js';
+export type { IOpenAiChatGptAuthorizationCode } from './smartai.auth.openai.js';
 
 // Re-export commonly used ai-sdk functions for consumer convenience
 export { generateText, streamText, tool, jsonSchema } from 'ai';
diff --git a/ts/smartai.auth.openai.ts b/ts/smartai.auth.openai.ts
index dcc77cc..b95666b 100644
--- a/ts/smartai.auth.openai.ts
+++ b/ts/smartai.auth.openai.ts
@@ -1,63 +1,63 @@
 import type {
-  IOpenAiMaxAuthCredentials,
-  IOpenAiMaxAuthOptions,
-  IOpenAiMaxCompleteDeviceCodeOptions,
-  IOpenAiMaxDeviceCode,
-  IOpenAiMaxDeviceCodePollOptions,
-  IOpenAiMaxIdTokenInfo,
-  IOpenAiMaxTokenData,
+  IOpenAiChatGptAuthCredentials,
+  IOpenAiChatGptAuthOptions,
+  IOpenAiChatGptCompleteDeviceCodeOptions,
+  IOpenAiChatGptDeviceCode,
+  IOpenAiChatGptDeviceCodePollOptions,
+  IOpenAiChatGptTokenData,
+  IOpenAiChatGptTokenInfo,
 } from './smartai.interfaces.js';
 
-export const OPENAI_MAX_AUTH_ISSUER = 'https://auth.openai.com';
-export const OPENAI_MAX_CLIENT_ID = 'app_EMoamEEZ73f0CkXaXp7hrann';
-export const OPENAI_MAX_CODEX_BASE_URL = 'https://chatgpt.com/backend-api/codex';
-export const OPENAI_MAX_DEFAULT_ORIGINATOR = 'smartai';
+export const OPENAI_CHATGPT_AUTH_ISSUER = 'https://auth.openai.com';
+export const OPENAI_CHATGPT_CLIENT_ID = 'app_EMoamEEZ73f0CkXaXp7hrann';
+export const OPENAI_CHATGPT_CODEX_BASE_URL = 'https://chatgpt.com/backend-api/codex';
+export const OPENAI_CHATGPT_DEFAULT_ORIGINATOR = 'smartai';
 
 const DEVICE_CODE_TIMEOUT_MS = 15 * 60 * 1000;
 
-export class OpenAiMaxAuthError extends Error {
+export class OpenAiChatGptAuthError extends Error {
   public status?: number;
   public body?: string;
 
   constructor(message: string, options: { status?: number; body?: string } = {}) {
     super(message);
-    this.name = 'OpenAiMaxAuthError';
+    this.name = 'OpenAiChatGptAuthError';
     this.status = options.status;
     this.body = options.body;
   }
 }
 
-export interface IOpenAiMaxAuthorizationCode {
+export interface IOpenAiChatGptAuthorizationCode {
   authorizationCode: string;
   codeChallenge: string;
   codeVerifier: string;
 }
 
-interface IOpenAiMaxTokenResponse {
+interface IOpenAiChatGptTokenResponse {
   id_token?: unknown;
   access_token?: unknown;
   refresh_token?: unknown;
 }
 
-function getFetch(options: IOpenAiMaxAuthOptions): typeof fetch {
+function getFetch(options: IOpenAiChatGptAuthOptions): typeof fetch {
   const fetchFunction = options.fetch ?? globalThis.fetch;
   if (!fetchFunction) {
-    throw new OpenAiMaxAuthError('fetch is not available for OpenAI Max authentication.');
+    throw new OpenAiChatGptAuthError('fetch is not available for OpenAI ChatGPT authentication.');
   }
   return fetchFunction;
 }
 
-function getIssuer(options: IOpenAiMaxAuthOptions): string {
-  return (options.issuer ?? OPENAI_MAX_AUTH_ISSUER).replace(/\/+$/, '');
+function getIssuer(options: IOpenAiChatGptAuthOptions): string {
+  return (options.issuer ?? OPENAI_CHATGPT_AUTH_ISSUER).replace(/\/+$/, '');
 }
 
-function getClientId(options: IOpenAiMaxAuthOptions): string {
-  return options.clientId ?? OPENAI_MAX_CLIENT_ID;
+function getClientId(options: IOpenAiChatGptAuthOptions): string {
+  return options.clientId ?? OPENAI_CHATGPT_CLIENT_ID;
 }
 
 function asString(value: unknown, name: string): string {
   if (typeof value !== 'string' || value.length === 0) {
-    throw new OpenAiMaxAuthError(`OpenAI Max auth response is missing ${name}.`);
+    throw new OpenAiChatGptAuthError(`OpenAI ChatGPT auth response is missing ${name}.`);
   }
   return value;
 }
@@ -69,7 +69,7 @@ function asOptionalString(value: unknown): string | undefined {
 function asIntervalSeconds(value: unknown): number {
   const interval = typeof value === 'number' ? value : Number.parseInt(String(value ?? ''), 10);
   if (!Number.isFinite(interval) || interval <= 0) {
-    throw new OpenAiMaxAuthError('OpenAI Max device-code response has an invalid interval.');
+    throw new OpenAiChatGptAuthError('OpenAI ChatGPT device-code response has an invalid interval.');
   }
   return interval;
 }
@@ -77,7 +77,7 @@ function asIntervalSeconds(value: unknown): number {
 async function readJson(response: Response, context: string): Promise<unknown> {
   const body = await response.text();
   if (!response.ok) {
-    throw new OpenAiMaxAuthError(`${context} failed with status ${response.status}.`, {
+    throw new OpenAiChatGptAuthError(`${context} failed with status ${response.status}.`, {
       status: response.status,
       body,
     });
@@ -86,14 +86,14 @@ async function readJson(response: Response, context: string): Promise<unknown> {
   try {
     return body ? JSON.parse(body) : {};
   } catch (error) {
-    throw new OpenAiMaxAuthError(`${context} returned invalid JSON: ${(error as Error).message}`, {
+    throw new OpenAiChatGptAuthError(`${context} returned invalid JSON: ${(error as Error).message}`, {
       status: response.status,
       body,
     });
   }
 }
 
-async function postJson(url: string, body: unknown, options: IOpenAiMaxAuthOptions): Promise<unknown> {
+async function postJson(url: string, body: unknown, options: IOpenAiChatGptAuthOptions): Promise<unknown> {
   const response = await getFetch(options)(url, {
     method: 'POST',
     headers: { 'Content-Type': 'application/json' },
@@ -102,7 +102,7 @@ async function postJson(url: string, body: unknown, options: IOpenAiMaxAuthOptio
   return readJson(response, `POST ${url}`);
 }
 
-async function postForm(url: string, body: URLSearchParams, options: IOpenAiMaxAuthOptions): Promise<unknown> {
+async function postForm(url: string, body: URLSearchParams, options: IOpenAiChatGptAuthOptions): Promise<unknown> {
   const response = await getFetch(options)(url, {
     method: 'POST',
     headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
@@ -118,18 +118,18 @@ function sleep(ms: number): Promise<void> {
 function parseJwtPayload(jwt: string): Record<string, unknown> {
   const parts = jwt.split('.');
   if (parts.length !== 3 || !parts[1]) {
-    throw new OpenAiMaxAuthError('OpenAI Max auth returned an invalid ID token.');
+    throw new OpenAiChatGptAuthError('OpenAI ChatGPT auth returned an invalid token.');
   }
 
   try {
     return JSON.parse(Buffer.from(parts[1], 'base64url').toString('utf8')) as Record<string, unknown>;
   } catch (error) {
-    throw new OpenAiMaxAuthError(`OpenAI Max ID token could not be parsed: ${(error as Error).message}`);
+    throw new OpenAiChatGptAuthError(`OpenAI ChatGPT token could not be parsed: ${(error as Error).message}`);
   }
 }
 
-export function parseOpenAiMaxIdToken(idToken: string): IOpenAiMaxIdTokenInfo {
-  const claims = parseJwtPayload(idToken);
+export function parseOpenAiChatGptTokenInfo(token: string): IOpenAiChatGptTokenInfo {
+  const claims = parseJwtPayload(token);
   const profile = claims['https://api.openai.com/profile'] as Record<string, unknown> | undefined;
   const auth = claims['https://api.openai.com/auth'] as Record<string, unknown> | undefined;
   const expiresAtSeconds = typeof claims.exp === 'number' ? claims.exp : undefined;
@@ -141,28 +141,37 @@ export function parseOpenAiMaxIdToken(idToken: string): IOpenAiMaxIdTokenInfo {
     chatgptAccountId: asOptionalString(auth?.chatgpt_account_id),
     chatgptAccountIsFedramp: auth?.chatgpt_account_is_fedramp === true,
     expiresAt: expiresAtSeconds ? new Date(expiresAtSeconds * 1000).toISOString() : undefined,
-    rawJwt: idToken,
+    rawJwt: token,
   };
 }
 
-function createTokenData(response: IOpenAiMaxTokenResponse): IOpenAiMaxTokenData {
-  const idToken = asString(response.id_token, 'id_token');
-  const accessToken = asString(response.access_token, 'access_token');
-  const refreshToken = asString(response.refresh_token, 'refresh_token');
-  const idTokenInfo = parseOpenAiMaxIdToken(idToken);
+function createTokenData(
+  response: IOpenAiChatGptTokenResponse,
+  existingTokenData?: IOpenAiChatGptTokenData,
+): IOpenAiChatGptTokenData {
+  const accessToken = asOptionalString(response.access_token) ?? existingTokenData?.accessToken;
+  const refreshToken = asOptionalString(response.refresh_token) ?? existingTokenData?.refreshToken;
+  const idToken = asOptionalString(response.id_token) ?? existingTokenData?.idToken;
+  if (!accessToken) {
+    throw new OpenAiChatGptAuthError('OpenAI ChatGPT auth response is missing access_token.');
+  }
+  if (!refreshToken) {
+    throw new OpenAiChatGptAuthError('OpenAI ChatGPT auth response is missing refresh_token.');
+  }
+  const tokenInfo = parseOpenAiChatGptTokenInfo(idToken ?? accessToken);
 
   return {
-    idToken,
     accessToken,
     refreshToken,
-    accountId: idTokenInfo.chatgptAccountId,
-    idTokenInfo,
+    idToken,
+    accountId: tokenInfo.chatgptAccountId,
+    tokenInfo,
   };
 }
 
-export async function requestOpenAiMaxDeviceCode(
-  options: IOpenAiMaxAuthOptions = {},
-): Promise<IOpenAiMaxDeviceCode> {
+export async function requestOpenAiChatGptDeviceCode(
+  options: IOpenAiChatGptAuthOptions = {},
+): Promise<IOpenAiChatGptDeviceCode> {
   const issuer = getIssuer(options);
   const response = await postJson(`${issuer}/api/accounts/deviceauth/usercode`, {
     client_id: getClientId(options),
@@ -176,10 +185,10 @@ export async function requestOpenAiMaxDeviceCode(
   };
 }
 
-export async function pollOpenAiMaxDeviceCode(
-  deviceCode: IOpenAiMaxDeviceCode,
-  options: IOpenAiMaxDeviceCodePollOptions = {},
-): Promise<IOpenAiMaxAuthorizationCode> {
+export async function pollOpenAiChatGptDeviceCode(
+  deviceCode: IOpenAiChatGptDeviceCode,
+  options: IOpenAiChatGptDeviceCodePollOptions = {},
+): Promise<IOpenAiChatGptAuthorizationCode> {
   const issuer = getIssuer(options);
   const pollUrl = `${issuer}/api/accounts/deviceauth/token`;
   const timeoutMs = options.timeoutMs ?? DEVICE_CODE_TIMEOUT_MS;
@@ -207,7 +216,7 @@ export async function pollOpenAiMaxDeviceCode(
 
     if (response.status !== 403 && response.status !== 404) {
       const body = await response.text();
-      throw new OpenAiMaxAuthError(`OpenAI Max device-code polling failed with status ${response.status}.`, {
+      throw new OpenAiChatGptAuthError(`OpenAI ChatGPT device-code polling failed with status ${response.status}.`, {
         status: response.status,
         body,
       });
@@ -218,13 +227,13 @@ export async function pollOpenAiMaxDeviceCode(
     await sleepFunction(Math.min(deviceCode.intervalSeconds * 1000, Math.max(remaining, 0)));
   }
 
-  throw new OpenAiMaxAuthError('OpenAI Max device-code login timed out.');
+  throw new OpenAiChatGptAuthError('OpenAI ChatGPT device-code login timed out.');
 }
 
-export async function exchangeOpenAiMaxAuthorizationCode(
-  authorizationCode: IOpenAiMaxAuthorizationCode,
-  options: IOpenAiMaxAuthOptions = {},
-): Promise<IOpenAiMaxTokenData> {
+export async function exchangeOpenAiChatGptAuthorizationCode(
+  authorizationCode: IOpenAiChatGptAuthorizationCode,
+  options: IOpenAiChatGptAuthOptions = {},
+): Promise<IOpenAiChatGptTokenData> {
   const issuer = getIssuer(options);
   const response = await postForm(`${issuer}/oauth/token`, new URLSearchParams({
     grant_type: 'authorization_code',
@@ -232,60 +241,60 @@ export async function exchangeOpenAiMaxAuthorizationCode(
     redirect_uri: `${issuer}/deviceauth/callback`,
     client_id: getClientId(options),
     code_verifier: authorizationCode.codeVerifier,
-  }), options) as IOpenAiMaxTokenResponse;
+  }), options) as IOpenAiChatGptTokenResponse;
 
   return createTokenData(response);
 }
 
-export function ensureOpenAiMaxWorkspaceAllowed(
-  tokenData: IOpenAiMaxTokenData,
+export function ensureOpenAiChatGptWorkspaceAllowed(
+  tokenData: IOpenAiChatGptTokenData,
   forcedChatGptWorkspaceId?: string,
 ): void {
   if (!forcedChatGptWorkspaceId) {
     return;
   }
-  if (tokenData.idTokenInfo.chatgptAccountId !== forcedChatGptWorkspaceId) {
-    throw new OpenAiMaxAuthError(`OpenAI Max login is restricted to workspace ${forcedChatGptWorkspaceId}.`);
+  if (tokenData.tokenInfo.chatgptAccountId !== forcedChatGptWorkspaceId) {
+    throw new OpenAiChatGptAuthError(`OpenAI ChatGPT login is restricted to workspace ${forcedChatGptWorkspaceId}.`);
   }
 }
 
-export async function completeOpenAiMaxDeviceCodeLogin(
-  deviceCode: IOpenAiMaxDeviceCode,
-  options: IOpenAiMaxCompleteDeviceCodeOptions = {},
-): Promise<IOpenAiMaxTokenData> {
-  const authorizationCode = await pollOpenAiMaxDeviceCode(deviceCode, options);
-  const tokenData = await exchangeOpenAiMaxAuthorizationCode(authorizationCode, options);
-  ensureOpenAiMaxWorkspaceAllowed(tokenData, options.forcedChatGptWorkspaceId);
+export async function completeOpenAiChatGptDeviceCodeLogin(
+  deviceCode: IOpenAiChatGptDeviceCode,
+  options: IOpenAiChatGptCompleteDeviceCodeOptions = {},
+): Promise<IOpenAiChatGptTokenData> {
+  const authorizationCode = await pollOpenAiChatGptDeviceCode(deviceCode, options);
+  const tokenData = await exchangeOpenAiChatGptAuthorizationCode(authorizationCode, options);
+  ensureOpenAiChatGptWorkspaceAllowed(tokenData, options.forcedChatGptWorkspaceId);
   return tokenData;
 }
 
-export async function refreshOpenAiMaxTokenData(
-  tokenData: IOpenAiMaxTokenData,
-  options: IOpenAiMaxAuthOptions = {},
-): Promise<IOpenAiMaxTokenData> {
+export async function refreshOpenAiChatGptTokenData(
+  tokenData: IOpenAiChatGptTokenData,
+  options: IOpenAiChatGptAuthOptions = {},
+): Promise<IOpenAiChatGptTokenData> {
   const issuer = getIssuer(options);
   const response = await postJson(`${issuer}/oauth/token`, {
     client_id: getClientId(options),
     grant_type: 'refresh_token',
     refresh_token: tokenData.refreshToken,
-  }, options) as IOpenAiMaxTokenResponse;
+  }, options) as IOpenAiChatGptTokenResponse;
 
   return createTokenData({
     id_token: response.id_token ?? tokenData.idToken,
     access_token: response.access_token ?? tokenData.accessToken,
     refresh_token: response.refresh_token ?? tokenData.refreshToken,
-  });
+  }, tokenData);
 }
 
-export function createOpenAiMaxProviderSettings(credentials: IOpenAiMaxAuthCredentials): {
+export function createOpenAiChatGptProviderSettings(credentials: IOpenAiChatGptAuthCredentials): {
   apiKey: string;
   baseURL: string;
   headers: Record<string, string>;
 } {
-  const accountId = credentials.accountId ?? credentials.idTokenInfo?.chatgptAccountId;
-  const isFedrampAccount = credentials.idTokenInfo?.chatgptAccountIsFedramp === true;
+  const accountId = credentials.accountId ?? credentials.tokenInfo?.chatgptAccountId;
+  const isFedrampAccount = credentials.tokenInfo?.chatgptAccountIsFedramp === true;
   const headers: Record<string, string> = {
-    originator: credentials.originator ?? OPENAI_MAX_DEFAULT_ORIGINATOR,
+    originator: credentials.originator ?? OPENAI_CHATGPT_DEFAULT_ORIGINATOR,
   };
 
   if (accountId) {
@@ -297,7 +306,7 @@ export function createOpenAiMaxProviderSettings(credentials: IOpenAiMaxAuthCrede
 
   return {
     apiKey: credentials.accessToken,
-    baseURL: credentials.baseUrl ?? OPENAI_MAX_CODEX_BASE_URL,
+    baseURL: credentials.baseUrl ?? OPENAI_CHATGPT_CODEX_BASE_URL,
     headers,
   };
 }
diff --git a/ts/smartai.classes.smartai.ts b/ts/smartai.classes.smartai.ts
index 658c99a..a87aeef 100644
--- a/ts/smartai.classes.smartai.ts
+++ b/ts/smartai.classes.smartai.ts
@@ -2,7 +2,7 @@ import * as plugins from './plugins.js';
 import type { ISmartAiModelSetup, ISmartAiOptions, LanguageModelV3 } from './smartai.interfaces.js';
 import { createOllamaModel } from './smartai.provider.ollama.js';
 import { createAnthropicCachingMiddleware } from './smartai.middleware.anthropic.js';
-import { createOpenAiMaxProviderSettings } from './smartai.auth.openai.js';
+import { createOpenAiChatGptProviderSettings } from './smartai.auth.openai.js';
 
 /**
  * Returns a LanguageModelV3 for the given provider and model.
@@ -24,8 +24,8 @@ export function getModel(options: ISmartAiOptions): LanguageModelV3 {
     }
     case 'openai': {
       const p = plugins.createOpenAI(
-        options.openAiMaxAuth
-          ? createOpenAiMaxProviderSettings(options.openAiMaxAuth)
+        options.openAiChatGptAuth
+          ? createOpenAiChatGptProviderSettings(options.openAiChatGptAuth)
           : { apiKey: options.apiKey },
       );
       return p(options.model) as LanguageModelV3;
diff --git a/ts/smartai.interfaces.ts b/ts/smartai.interfaces.ts
index 523f67e..c275775 100644
--- a/ts/smartai.interfaces.ts
+++ b/ts/smartai.interfaces.ts
@@ -15,7 +15,7 @@ export type TOpenAiReasoningEffort = 'none' | 'minimal' | 'low' | 'medium' | 'hi
 
 export type TOpenAiTextVerbosity = 'low' | 'medium' | 'high';
 
-export interface IOpenAiMaxIdTokenInfo {
+export interface IOpenAiChatGptTokenInfo {
   email?: string;
   chatgptPlanType?: string;
   chatgptUserId?: string;
@@ -25,41 +25,40 @@ export interface IOpenAiMaxIdTokenInfo {
   rawJwt: string;
 }
 
-export interface IOpenAiMaxAuthCredentials {
+export interface IOpenAiChatGptAuthCredentials {
   accessToken: string;
   refreshToken?: string;
   idToken?: string;
   accountId?: string;
-  idTokenInfo?: IOpenAiMaxIdTokenInfo;
+  tokenInfo?: IOpenAiChatGptTokenInfo;
   baseUrl?: string;
   originator?: string;
 }
 
-export interface IOpenAiMaxTokenData extends IOpenAiMaxAuthCredentials {
+export interface IOpenAiChatGptTokenData extends IOpenAiChatGptAuthCredentials {
   refreshToken: string;
-  idToken: string;
-  idTokenInfo: IOpenAiMaxIdTokenInfo;
+  tokenInfo: IOpenAiChatGptTokenInfo;
 }
 
-export interface IOpenAiMaxDeviceCode {
+export interface IOpenAiChatGptDeviceCode {
   verificationUrl: string;
   userCode: string;
   deviceAuthId: string;
   intervalSeconds: number;
 }
 
-export interface IOpenAiMaxAuthOptions {
+export interface IOpenAiChatGptAuthOptions {
   issuer?: string;
   clientId?: string;
   fetch?: typeof fetch;
 }
 
-export interface IOpenAiMaxDeviceCodePollOptions extends IOpenAiMaxAuthOptions {
+export interface IOpenAiChatGptDeviceCodePollOptions extends IOpenAiChatGptAuthOptions {
   timeoutMs?: number;
   sleep?: (ms: number) => Promise<void>;
 }
 
-export interface IOpenAiMaxCompleteDeviceCodeOptions extends IOpenAiMaxDeviceCodePollOptions {
+export interface IOpenAiChatGptCompleteDeviceCodeOptions extends IOpenAiChatGptDeviceCodePollOptions {
   forcedChatGptWorkspaceId?: string;
 }
 
@@ -108,7 +107,7 @@ export interface ISmartAiOptions {
    * OpenAI ChatGPT/Codex subscription credentials from the device-code auth flow.
    * Only used when provider === 'openai'.
    */
-  openAiMaxAuth?: IOpenAiMaxAuthCredentials;
+  openAiChatGptAuth?: IOpenAiChatGptAuthCredentials;
   /**
    * Provider-specific AI SDK generation options.
    * Pass this to generateText()/streamText() alongside the model.
diff --git a/ts_openai_chatgpt_auth/index.ts b/ts_openai_chatgpt_auth/index.ts
new file mode 100644
index 0000000..f3b45d5
--- /dev/null
+++ b/ts_openai_chatgpt_auth/index.ts
@@ -0,0 +1,351 @@
+import * as fs from 'node:fs/promises';
+import * as os from 'node:os';
+import * as path from 'node:path';
+import {
+  parseOpenAiChatGptTokenInfo,
+  refreshOpenAiChatGptTokenData,
+} from '../ts/smartai.auth.openai.js';
+import type {
+  IOpenAiChatGptAuthOptions,
+  IOpenAiChatGptTokenData,
+  IOpenAiChatGptTokenInfo,
+} from '../ts/smartai.interfaces.js';
+
+export type TOpenAiChatGptAuthSource = 'smartai' | 'opencode' | 'codex';
+export type TOpenAiChatGptAuthFileFormat = TOpenAiChatGptAuthSource | 'auto';
+
+export interface IOpenAiChatGptAuthSourceConfig {
+  source: TOpenAiChatGptAuthSource;
+  filePath?: string;
+  format?: TOpenAiChatGptAuthFileFormat;
+  writeBack?: boolean;
+}
+
+export interface IOpenAiChatGptAuthSourceInspection {
+  source: TOpenAiChatGptAuthSource;
+  filePath: string;
+  exists: boolean;
+  usable: boolean;
+  expired?: boolean;
+  accountId?: string;
+  email?: string;
+  plan?: string;
+  expiresAt?: string;
+  error?: string;
+}
+
+export interface IInspectOpenAiChatGptAuthSourcesOptions {
+  sources?: Array<TOpenAiChatGptAuthSource | IOpenAiChatGptAuthSourceConfig>;
+  homeDir?: string;
+  now?: Date;
+}
+
+export interface IResolveOpenAiChatGptAuthOptions extends IInspectOpenAiChatGptAuthSourcesOptions {
+  refresh?: 'ifNeeded' | false;
+  writeBack?: Partial<Record<TOpenAiChatGptAuthSource, boolean>>;
+  authOptions?: IOpenAiChatGptAuthOptions;
+}
+
+export interface IResolvedOpenAiChatGptAuth {
+  source: TOpenAiChatGptAuthSource;
+  filePath: string;
+  tokenData: IOpenAiChatGptTokenData;
+  refreshed: boolean;
+}
+
+interface INormalizedOpenAiChatGptAuthSourceConfig {
+  source: TOpenAiChatGptAuthSource;
+  filePath: string;
+  format: TOpenAiChatGptAuthFileFormat;
+  writeBack?: boolean;
+}
+
+const defaultSources: TOpenAiChatGptAuthSource[] = ['smartai', 'opencode', 'codex'];
+const refreshWindowMs = 5 * 60 * 1000;
+
+export const getDefaultOpenAiChatGptAuthPath = (
+  source: TOpenAiChatGptAuthSource,
+  homeDir = os.homedir(),
+): string => {
+  switch (source) {
+    case 'smartai':
+      return path.join(homeDir, '.git.zone', 'ide', 'openai-chatgpt-auth.json');
+    case 'opencode':
+      return path.join(homeDir, '.local', 'share', 'opencode', 'auth.json');
+    case 'codex':
+      return path.join(homeDir, '.codex', 'auth.json');
+    default:
+      throw new Error(`Unsupported OpenAI ChatGPT auth source: ${source satisfies never}`);
+  }
+};
+
+export const normalizeOpenAiChatGptAuth = (
+  input: unknown,
+  format: TOpenAiChatGptAuthFileFormat = 'auto',
+): IOpenAiChatGptTokenData | undefined => {
+  if (format === 'auto') {
+    return normalizeOpenAiChatGptAuth(input, 'smartai')
+      ?? normalizeOpenAiChatGptAuth(input, 'opencode')
+      ?? normalizeOpenAiChatGptAuth(input, 'codex');
+  }
+
+  if (!isRecord(input)) return undefined;
+  if (format === 'opencode') {
+    return normalizeOpenCodeAuth(input);
+  }
+  return normalizeTokenObject(isRecord(input.tokens) ? input.tokens : input);
+};
+
+export const readOpenAiChatGptAuthFile = async (
+  filePath: string,
+  format: TOpenAiChatGptAuthFileFormat = 'auto',
+): Promise<IOpenAiChatGptTokenData | undefined> => {
+  const parsed = JSON.parse(await fs.readFile(filePath, 'utf8')) as unknown;
+  return normalizeOpenAiChatGptAuth(parsed, format);
+};
+
+export const inspectOpenAiChatGptAuthSources = async (
+  options: IInspectOpenAiChatGptAuthSourcesOptions = {},
+): Promise<IOpenAiChatGptAuthSourceInspection[]> => {
+  const now = options.now ?? new Date();
+  const sourceConfigs = normalizeSourceConfigs(options.sources, options.homeDir);
+  return Promise.all(sourceConfigs.map(async (sourceConfig) => {
+    try {
+      const tokenData = await readOpenAiChatGptAuthFile(sourceConfig.filePath!, sourceConfig.format ?? sourceConfig.source);
+      if (!tokenData) {
+        return {
+          source: sourceConfig.source,
+          filePath: sourceConfig.filePath!,
+          exists: true,
+          usable: false,
+          error: 'No OpenAI ChatGPT auth token found in file.',
+        };
+      }
+      return toInspection(sourceConfig.source, sourceConfig.filePath!, tokenData, now);
+    } catch (error) {
+      const nodeError = error as NodeJS.ErrnoException;
+      return {
+        source: sourceConfig.source,
+        filePath: sourceConfig.filePath!,
+        exists: nodeError.code !== 'ENOENT',
+        usable: false,
+        error: nodeError.code === 'ENOENT' ? undefined : nodeError.message,
+      };
+    }
+  }));
+};
+
+export const resolveOpenAiChatGptAuth = async (
+  options: IResolveOpenAiChatGptAuthOptions = {},
+): Promise<IResolvedOpenAiChatGptAuth | undefined> => {
+  const now = options.now ?? new Date();
+  const sourceConfigs = normalizeSourceConfigs(options.sources, options.homeDir);
+  const refresh = options.refresh ?? 'ifNeeded';
+
+  for (const sourceConfig of sourceConfigs) {
+    let tokenData: IOpenAiChatGptTokenData | undefined;
+    try {
+      tokenData = await readOpenAiChatGptAuthFile(sourceConfig.filePath!, sourceConfig.format ?? sourceConfig.source);
+    } catch (error) {
+      const nodeError = error as NodeJS.ErrnoException;
+      if (nodeError.code === 'ENOENT') continue;
+      continue;
+    }
+    if (!tokenData) continue;
+
+    const shouldRefresh = refresh === 'ifNeeded' && shouldRefreshToken(tokenData, now);
+    const writeBack = sourceConfig.writeBack ?? options.writeBack?.[sourceConfig.source] ?? sourceConfig.source === 'smartai';
+    if (!shouldRefresh) {
+      return { source: sourceConfig.source, filePath: sourceConfig.filePath!, tokenData, refreshed: false };
+    }
+
+    if (!writeBack) {
+      if (!isExpired(tokenData, now)) {
+        return { source: sourceConfig.source, filePath: sourceConfig.filePath!, tokenData, refreshed: false };
+      }
+      continue;
+    }
+
+    try {
+      const refreshed = await refreshOpenAiChatGptTokenData(tokenData, options.authOptions ?? {});
+      await writeOpenAiChatGptAuthFile(sourceConfig.filePath!, refreshed, sourceConfig.format ?? sourceConfig.source);
+      return { source: sourceConfig.source, filePath: sourceConfig.filePath!, tokenData: refreshed, refreshed: true };
+    } catch {
+      continue;
+    }
+  }
+
+  return undefined;
+};
+
+export const writeOpenAiChatGptAuthFile = async (
+  filePath: string,
+  tokenData: IOpenAiChatGptTokenData,
+  format: TOpenAiChatGptAuthFileFormat = 'smartai',
+): Promise<void> => {
+  const current = await readJsonFileIfExists(filePath);
+  const payload = format === 'opencode'
+    ? toOpenCodeAuthFile(current, tokenData)
+    : format === 'codex'
+      ? toCodexAuthFile(current, tokenData)
+      : toSmartAiAuthFile(tokenData);
+  await writeJsonAtomic(filePath, payload);
+};
+
+const normalizeSourceConfigs = (
+  sources: Array<TOpenAiChatGptAuthSource | IOpenAiChatGptAuthSourceConfig> | undefined,
+  homeDir = os.homedir(),
+): INormalizedOpenAiChatGptAuthSourceConfig[] => {
+  return (sources ?? defaultSources).map((sourceInput) => {
+    const sourceConfig = typeof sourceInput === 'string' ? { source: sourceInput } : sourceInput;
+    return {
+      source: sourceConfig.source,
+      filePath: sourceConfig.filePath ?? getDefaultOpenAiChatGptAuthPath(sourceConfig.source, homeDir),
+      format: sourceConfig.format ?? sourceConfig.source,
+      writeBack: sourceConfig.writeBack,
+    };
+  });
+};
+
+const toInspection = (
+  source: TOpenAiChatGptAuthSource,
+  filePath: string,
+  tokenData: IOpenAiChatGptTokenData,
+  now: Date,
+): IOpenAiChatGptAuthSourceInspection => {
+  const expired = isExpired(tokenData, now);
+  return {
+    source,
+    filePath,
+    exists: true,
+    usable: !expired,
+    expired,
+    accountId: tokenData.accountId ?? tokenData.tokenInfo.chatgptAccountId,
+    email: tokenData.tokenInfo.email,
+    plan: tokenData.tokenInfo.chatgptPlanType,
+    expiresAt: tokenData.tokenInfo.expiresAt,
+  };
+};
+
+const normalizeTokenObject = (input: Record<string, unknown>): IOpenAiChatGptTokenData | undefined => {
+  const accessToken = stringValue(input.accessToken) ?? stringValue(input.access_token);
+  const refreshToken = stringValue(input.refreshToken) ?? stringValue(input.refresh_token);
+  const idToken = stringValue(input.idToken) ?? stringValue(input.id_token) ?? stringValue((input.tokenInfo as Record<string, unknown> | undefined)?.rawJwt);
+  const accountId = stringValue(input.accountId) ?? stringValue(input.account_id);
+  return createTokenDataFromValues({ accessToken, refreshToken, idToken, accountId });
+};
+
+const normalizeOpenCodeAuth = (input: Record<string, unknown>): IOpenAiChatGptTokenData | undefined => {
+  if (!isRecord(input.openai)) return undefined;
+  const accessToken = stringValue(input.openai.access);
+  const refreshToken = stringValue(input.openai.refresh);
+  const accountId = stringValue(input.openai.accountId);
+  const expiresAt = typeof input.openai.expires === 'number' ? new Date(input.openai.expires).toISOString() : undefined;
+  return createTokenDataFromValues({ accessToken, refreshToken, accountId, fallbackExpiresAt: expiresAt });
+};
+
+const createTokenDataFromValues = (input: {
+  accessToken?: string;
+  refreshToken?: string;
+  idToken?: string;
+  accountId?: string;
+  fallbackExpiresAt?: string;
+}): IOpenAiChatGptTokenData | undefined => {
+  if (!input.accessToken || !input.refreshToken) return undefined;
+  const parseToken = input.idToken ?? input.accessToken;
+  const tokenInfo = parseTokenInfo(parseToken, input.accountId, input.fallbackExpiresAt);
+  return {
+    accessToken: input.accessToken,
+    refreshToken: input.refreshToken,
+    idToken: input.idToken,
+    accountId: input.accountId ?? tokenInfo.chatgptAccountId,
+    tokenInfo,
+  };
+};
+
+const parseTokenInfo = (token: string, accountId?: string, fallbackExpiresAt?: string): IOpenAiChatGptTokenInfo => {
+  try {
+    const tokenInfo = parseOpenAiChatGptTokenInfo(token);
+    return {
+      ...tokenInfo,
+      chatgptAccountId: tokenInfo.chatgptAccountId ?? accountId,
+      expiresAt: tokenInfo.expiresAt ?? fallbackExpiresAt,
+    };
+  } catch {
+    return {
+      chatgptAccountId: accountId,
+      chatgptAccountIsFedramp: false,
+      expiresAt: fallbackExpiresAt,
+      rawJwt: token,
+    };
+  }
+};
+
+const toSmartAiAuthFile = (tokenData: IOpenAiChatGptTokenData): Record<string, unknown> => ({
+  accessToken: tokenData.accessToken,
+  refreshToken: tokenData.refreshToken,
+  idToken: tokenData.idToken,
+  accountId: tokenData.accountId,
+  tokenInfo: tokenData.tokenInfo,
+});
+
+const toCodexAuthFile = (current: Record<string, unknown>, tokenData: IOpenAiChatGptTokenData): Record<string, unknown> => ({
+  ...current,
+  OPENAI_API_KEY: current.OPENAI_API_KEY ?? null,
+  tokens: {
+    ...(isRecord(current.tokens) ? current.tokens : {}),
+    id_token: tokenData.idToken,
+    access_token: tokenData.accessToken,
+    refresh_token: tokenData.refreshToken,
+    account_id: tokenData.accountId ?? tokenData.tokenInfo.chatgptAccountId,
+  },
+  last_refresh: new Date().toISOString(),
+});
+
+const toOpenCodeAuthFile = (current: Record<string, unknown>, tokenData: IOpenAiChatGptTokenData): Record<string, unknown> => ({
+  ...current,
+  openai: {
+    ...(isRecord(current.openai) ? current.openai : {}),
+    type: 'oauth',
+    refresh: tokenData.refreshToken,
+    access: tokenData.accessToken,
+    expires: tokenData.tokenInfo.expiresAt ? Date.parse(tokenData.tokenInfo.expiresAt) : undefined,
+    accountId: tokenData.accountId ?? tokenData.tokenInfo.chatgptAccountId,
+  },
+});
+
+const shouldRefreshToken = (tokenData: IOpenAiChatGptTokenData, now: Date): boolean => {
+  if (!tokenData.tokenInfo.expiresAt) return false;
+  return Date.parse(tokenData.tokenInfo.expiresAt) - now.getTime() < refreshWindowMs;
+};
+
+const isExpired = (tokenData: IOpenAiChatGptTokenData, now: Date): boolean => {
+  if (!tokenData.tokenInfo.expiresAt) return false;
+  return Date.parse(tokenData.tokenInfo.expiresAt) <= now.getTime();
+};
+
+const readJsonFileIfExists = async (filePath: string): Promise<Record<string, unknown>> => {
+  try {
+    const parsed = JSON.parse(await fs.readFile(filePath, 'utf8')) as unknown;
+    return isRecord(parsed) ? parsed : {};
+  } catch (error) {
+    const nodeError = error as NodeJS.ErrnoException;
+    if (nodeError.code === 'ENOENT') return {};
+    throw error;
+  }
+};
+
+const writeJsonAtomic = async (filePath: string, payload: unknown): Promise<void> => {
+  const tempPath = `${filePath}.${process.pid}.${Date.now()}.tmp`;
+  await fs.mkdir(path.dirname(filePath), { recursive: true, mode: 0o700 });
+  await fs.writeFile(tempPath, `${JSON.stringify(payload, undefined, 2)}\n`, { mode: 0o600 });
+  await fs.rename(tempPath, filePath);
+};
+
+const isRecord = (value: unknown): value is Record<string, unknown> => {
+  return !!value && typeof value === 'object' && !Array.isArray(value);
+};
+
+const stringValue = (value: unknown): string | undefined => {
+  return typeof value === 'string' && value.length > 0 ? value : undefined;
+};