fix(frontend): ensure Codex base URLs include /v1

frontend/src/components/keys/UseKeyModal.vue

@@ -736,12 +736,14 @@ const currentFiles = computed((): FileConfig[] => {
   switch (props.platform) {
     case 'openai':
       if (activeClientTab.value === 'claude') {
-        return generateAnthropicFiles(baseUrl, apiKey)
+        // Anthropic clients append /v1/messages themselves.
+        return generateAnthropicFiles(baseRoot, apiKey)
       }
       if (activeClientTab.value === 'codex-ws') {
-        return generateOpenAIWsFiles(baseUrl, apiKey)
+        return generateOpenAIWsFiles(apiBase, apiKey)
       }
-      return generateOpenAIFiles(baseUrl, apiKey)
+      // Codex appends /responses directly and does not add /v1.
+      return generateOpenAIFiles(apiBase, apiKey)
     case 'gemini':
       if (activeClientTab.value === 'codex') {
         return generateRoutedCodexFiles(apiBase, apiKey, 'gemini')

frontend/src/components/keys/__tests__/UseKeyModal.spec.ts

@@ -384,6 +384,45 @@ describe('UseKeyModal', () => {
     expect(wrapper.find('[data-testid="codex-api-key-restart-notice"]').exists()).toBe(false)
   })
 
+  it('normalizes OpenAI Codex and Claude base URLs independently', async () => {
+    const wrapper = mount(UseKeyModal, {
+      props: {
+        show: true,
+        apiKey: 'sk-test',
+        baseUrl: 'https://example.com',
+        platform: 'openai',
+        allowMessagesDispatch: true
+      },
+      global: {
+        stubs: {
+          BaseDialog: {
+            template: '<div><slot /><slot name="footer" /></div>'
+          },
+          Icon: {
+            template: '<span />'
+          }
+        }
+      }
+    })
+
+    const codexConfig = wrapper.findAll('pre code')
+      .map((code) => code.text())
+      .find((content) => content.includes('model_provider = "OpenAI"'))
+    expect(codexConfig).toContain('base_url = "https://example.com/v1"')
+
+    const claudeTab = wrapper.findAll('button').find((button) =>
+      button.text().includes('keys.useKeyModal.cliTabs.claudeCode')
+    )
+    expect(claudeTab).toBeDefined()
+    await claudeTab!.trigger('click')
+    await nextTick()
+
+    const claudeConfig = wrapper.findAll('pre code')
+      .map((code) => code.text())
+      .find((content) => content.startsWith('export ANTHROPIC_BASE_URL'))
+    expect(claudeConfig).toContain('ANTHROPIC_BASE_URL="https://example.com"')
+  })
+
   it('renders API Key Mode authorization in OpenAI Codex config', async () => {
     const wrapper = mount(UseKeyModal, {
       props: {

frontend/src/utils/__tests__/ccswitchImport.spec.ts

@@ -38,11 +38,29 @@ describe('ccswitchImport utils', () => {
 
     expect(params.get('resource')).toBe('provider')
     expect(params.get('app')).toBe('codex')
-    expect(params.get('endpoint')).toBe(baseInput.baseUrl)
+    expect(params.get('endpoint')).toBe(`${baseInput.baseUrl}/v1`)
     expect(params.get('model')).toBe(OPENAI_CC_SWITCH_CODEX_MODEL)
     expect(atob(params.get('usageScript') || '')).toBe(baseInput.usageScript)
   })
 
+  it.each([
+    'https://api.example.com',
+    'https://api.example.com/',
+    'https://api.example.com/v1',
+    'https://api.example.com/v1/'
+  ])('imports Codex with exactly one /v1 suffix for base URL %s', (baseUrl) => {
+    const params = paramsFromDeeplink(
+      buildCcSwitchImportDeeplink({
+        ...baseInput,
+        baseUrl,
+        platform: 'openai',
+        clientType: 'claude'
+      })
+    )
+
+    expect(params.get('endpoint')).toBe('https://api.example.com/v1')
+  })
+
   it.each([
     'https://api.example.com',
     'https://api.example.com/',

frontend/src/utils/ccswitchImport.ts

@@ -39,7 +39,7 @@ export function resolveCcSwitchImportConfig(
     case 'openai':
       return {
         app: 'codex',
-        endpoint: baseUrl,
+        endpoint: withV1Endpoint(baseUrl),
         model: OPENAI_CC_SWITCH_CODEX_MODEL
       }
     case 'gemini':