Expose ChatGPT Official model catalog

When ChatGPT Official is active, the model API now returns the OpenAI Codex catalog and reads or writes the selected GPT model from cc-haha managed settings. Desktop provider activation also recognizes the built-in provider id and resets the current model to the OpenAI default instead of looking for a saved provider record.

Constraint: ChatGPT Official is a built-in provider and is not present in providers.json providers[].

Rejected: Reuse the four-slot provider model list | it hides GPT-5.5 and misrepresents the OpenAI catalog as Anthropic slot names.

Confidence: high

Scope-risk: moderate

Tested: bun test src/server/__tests__/settings.test.ts

Tested: bun test src/server/__tests__/providers.test.ts --test-name-pattern "ChatGPT Official|getProviderForProxy"

Tested: bun test src/server/__tests__/conversation-service.test.ts --test-name-pattern "ChatGPT Official|session-scoped provider"

Tested: cd desktop && bun run test src/stores/providerStore.test.ts

Tested: git diff --check

desktop/src/constants/openaiOfficialProvider.ts

@@ -0,0 +1,2 @@
+export const OPENAI_OFFICIAL_PROVIDER_ID = 'openai-official'
+export const OPENAI_OFFICIAL_DEFAULT_MODEL_ID = 'gpt-5.3-codex'

desktop/src/stores/providerStore.test.ts

@@ -7,6 +7,8 @@ const {
   runtimeStoreState,
   setSessionRuntimeMock,
   setSelectionMock,
+  settingsSetModelMock,
+  settingsFetchAllMock,
 } = vi.hoisted(() => ({
   providersApiMock: {
     list: vi.fn(),
@@ -32,6 +34,8 @@ const {
   },
   setSessionRuntimeMock: vi.fn(),
   setSelectionMock: vi.fn(),
+  settingsSetModelMock: vi.fn(),
+  settingsFetchAllMock: vi.fn(),
 }))
 
 vi.mock('../api/providers', () => ({
@@ -59,8 +63,8 @@ vi.mock('./sessionRuntimeStore', () => ({
 vi.mock('./settingsStore', () => ({
   useSettingsStore: {
     getState: () => ({
-      setModel: vi.fn(),
-      fetchAll: vi.fn(),
+      setModel: settingsSetModelMock,
+      fetchAll: settingsFetchAllMock,
     }),
   },
 }))
@@ -147,4 +151,33 @@ describe('providerStore runtime refresh', () => {
     expect(setSelectionMock).not.toHaveBeenCalled()
     expect(setSessionRuntimeMock).not.toHaveBeenCalled()
   })
+
+  it('sets the OpenAI default model when activating built-in ChatGPT Official', async () => {
+    providersApiMock.activate.mockResolvedValue({ ok: true })
+    providersApiMock.list.mockResolvedValue({
+      providers: [],
+      activeId: 'openai-official',
+    })
+
+    const { useProviderStore } = await import('./providerStore')
+    await useProviderStore.getState().activateProvider('openai-official')
+
+    expect(settingsSetModelMock).toHaveBeenCalledWith('gpt-5.3-codex')
+    expect(settingsFetchAllMock).toHaveBeenCalled()
+  })
+
+  it('sets the provider main model when activating a saved provider', async () => {
+    const provider = makeProvider()
+    providersApiMock.activate.mockResolvedValue({ ok: true })
+    providersApiMock.list.mockResolvedValue({
+      providers: [provider],
+      activeId: provider.id,
+    })
+
+    const { useProviderStore } = await import('./providerStore')
+    await useProviderStore.getState().activateProvider(provider.id)
+
+    expect(settingsSetModelMock).toHaveBeenCalledWith('model-main')
+    expect(settingsFetchAllMock).toHaveBeenCalled()
+  })
 })

desktop/src/stores/providerStore.ts

@@ -6,6 +6,10 @@ import { useChatStore } from './chatStore'
 import { useSessionRuntimeStore } from './sessionRuntimeStore'
 import { useSettingsStore } from './settingsStore'
 import { OFFICIAL_DEFAULT_MODEL_ID } from '../constants/modelCatalog'
+import {
+  OPENAI_OFFICIAL_DEFAULT_MODEL_ID,
+  OPENAI_OFFICIAL_PROVIDER_ID,
+} from '../constants/openaiOfficialProvider'
 import type {
   SavedProvider,
   CreateProviderInput,
@@ -145,12 +149,17 @@ export const useProviderStore = create<ProviderStore>((set, get) => ({
     await get().fetchProviders()
     // 更新默认 provider 时，同步刷新默认 model，避免 settings.json 里残留
     // 旧 provider 的 model id 导致默认选择指向不存在的模型。
-    const provider = get().providers.find((p) => p.id === id)
-    if (provider) {
-      const settings = useSettingsStore.getState()
-      await settings.setModel(provider.models.main)
+    const settings = useSettingsStore.getState()
+    if (id === OPENAI_OFFICIAL_PROVIDER_ID) {
+      await settings.setModel(OPENAI_OFFICIAL_DEFAULT_MODEL_ID)
       await settings.fetchAll()
+      return
     }
+
+    const provider = get().providers.find((p) => p.id === id)
+    if (!provider) return
+    await settings.setModel(provider.models.main)
+    await settings.fetchAll()
   },
 
   activateOfficial: async () => {

src/server/__tests__/settings.test.ts

@@ -625,6 +625,65 @@ describe('Models API', () => {
     expect(globalSettings.model).toBeUndefined()
   })
 
+  it('GET /api/models should return the OpenAI model catalog when ChatGPT Official is active', async () => {
+    const providerSvc = new ProviderService()
+    await providerSvc.activateProvider('openai-official')
+
+    const { req, url, segments } = makeRequest('GET', '/api/models')
+    const res = await handleModelsApi(req, url, segments)
+
+    expect(res.status).toBe(200)
+    const body = await res.json() as {
+      models: Array<{ id: string; name: string }>
+      provider: { id: string; name: string } | null
+    }
+    expect(body.provider).toEqual({
+      id: 'openai-official',
+      name: 'ChatGPT Official',
+    })
+    expect(body.models.map((model) => model.id)).toEqual([
+      'gpt-5.3-codex',
+      'gpt-5.4',
+      'gpt-5.5',
+      'gpt-5.4-mini',
+    ])
+  })
+
+  it('PUT /api/models/current should persist GPT model to managed settings when ChatGPT Official is active', async () => {
+    const settingsSvc = new SettingsService()
+    const providerSvc = new ProviderService()
+    await settingsSvc.updateUserSettings({ model: 'claude-haiku-4-5' })
+    await providerSvc.activateProvider('openai-official')
+
+    const { req, url, segments } = makeRequest('PUT', '/api/models/current', {
+      modelId: 'gpt-5.5',
+    })
+    const res = await handleModelsApi(req, url, segments)
+
+    expect(res.status).toBe(200)
+    const managedSettings = await providerSvc.getManagedSettings()
+    expect(managedSettings.model).toBe('gpt-5.5')
+
+    const globalSettings = await settingsSvc.getUserSettings()
+    expect(globalSettings.model).toBe('claude-haiku-4-5')
+  })
+
+  it('GET /api/models/current should read current GPT model from managed settings when ChatGPT Official is active', async () => {
+    const providerSvc = new ProviderService()
+    await providerSvc.activateProvider('openai-official')
+    await providerSvc.updateManagedSettings({ model: 'gpt-5.5' })
+
+    const { req, url, segments } = makeRequest('GET', '/api/models/current')
+    const res = await handleModelsApi(req, url, segments)
+
+    expect(res.status).toBe(200)
+    const body = await res.json()
+    expect(body.model).toMatchObject({
+      id: 'gpt-5.5',
+      name: 'GPT-5.5',
+    })
+  })
+
   it('GET /api/effort should return default effort level', async () => {
     const { req, url, segments } = makeRequest('GET', '/api/effort')
     const res = await handleModelsApi(req, url, segments)

src/server/api/models.ts

@@ -13,6 +13,11 @@ import { ProviderService } from '../services/providerService.js'
 import { ApiError, errorResponse } from '../middleware/errorHandler.js'
 import { hasOpenAIAuthLogin } from '../../utils/auth.js'
 import { OPENAI_CODEX_MODEL_CATALOG } from '../../services/openaiAuth/models.js'
+import {
+  OPENAI_OFFICIAL_PROVIDER_ID,
+  OPENAI_OFFICIAL_PROVIDER_NAME,
+  isOpenAIOfficialProviderId,
+} from '../services/openaiOfficialProvider.js'
 
 // ─── Fallback models (used when no provider is configured) ────────────────────
 
@@ -109,6 +114,15 @@ function buildProviderModelList(models: {
   return modelList
 }
 
+function buildOpenAIModelList(): ApiModelInfo[] {
+  return OPENAI_CODEX_MODEL_CATALOG.map(model => ({
+    id: model.value,
+    name: model.label,
+    description: model.description,
+    context: '',
+  }))
+}
+
 function getEnvConfiguredAnthropicModels(): ApiModelInfo[] {
   return buildProviderModelList({
     main: process.env.ANTHROPIC_MODEL?.trim() || '',
@@ -123,12 +137,7 @@ function getOpenAIAuthModels(): ApiModelInfo[] {
     return []
   }
 
-  return OPENAI_CODEX_MODEL_CATALOG.map(model => ({
-    id: model.value,
-    name: model.label,
-    description: model.description,
-    context: '',
-  }))
+  return buildOpenAIModelList()
 }
 
 function getStandaloneModelList(): ApiModelInfo[] {
@@ -189,6 +198,16 @@ export async function handleModelsApi(
 
 async function handleModelsList(): Promise<Response> {
   const { providers, activeId } = await providerService.listProviders()
+  if (isOpenAIOfficialProviderId(activeId)) {
+    return Response.json({
+      models: buildOpenAIModelList(),
+      provider: {
+        id: OPENAI_OFFICIAL_PROVIDER_ID,
+        name: OPENAI_OFFICIAL_PROVIDER_NAME,
+      },
+    })
+  }
+
   const activeProvider = activeId ? providers.find((p) => p.id === activeId) : null
   if (activeProvider) {
     const modelList = buildProviderModelList(activeProvider.models)
@@ -204,8 +223,9 @@ async function handleCurrentModel(req: Request): Promise<Response> {
   if (req.method === 'GET') {
     // Build the full model list: prefer active provider's models, fall back to defaults
     const { providers, activeId } = await providerService.listProviders()
+    const isOpenAIProviderActive = isOpenAIOfficialProviderId(activeId)
     const activeProvider = activeId ? providers.find((p) => p.id === activeId) : null
-    const settings = activeProvider
+    const settings = activeProvider || isOpenAIProviderActive
       ? await providerService.getManagedSettings()
       : await settingsService.getUserSettings()
     const explicitModel = (settings.model as string) || ''
@@ -216,7 +236,10 @@ async function handleCurrentModel(req: Request): Promise<Response> {
     let currentModelId: string
     let currentModelName: string
 
-    if (activeProvider) {
+    if (isOpenAIProviderActive) {
+      currentModelId = explicitModel || env.ANTHROPIC_MODEL || 'gpt-5.3-codex'
+      currentModelName = currentModelId
+    } else if (activeProvider) {
       // Provider is active — only use the provider-managed cc-haha settings.
       // This avoids leaking global ~/.claude/settings.json model choices into
       // the active provider flow.
@@ -237,9 +260,11 @@ async function handleCurrentModel(req: Request): Promise<Response> {
     const lookupId = contextTier ? `${currentModelId}:${contextTier}` : currentModelId
 
     // Build available models for name lookup
-    const availableModels = activeProvider
-      ? buildProviderModelList(activeProvider.models)
-      : getStandaloneModelList()
+    const availableModels = isOpenAIProviderActive
+      ? buildOpenAIModelList()
+      : activeProvider
+        ? buildProviderModelList(activeProvider.models)
+        : getStandaloneModelList()
 
     const modelEntry = availableModels.find((m) => m.id === lookupId)
       || availableModels.find((m) => m.id === currentModelId)