diff --git a/packages/stage-ui/src/libs/providers/validators/openai-compatible.test.ts b/packages/stage-ui/src/libs/providers/validators/openai-compatible.test.ts
index dde3cb3e7..b1fa16d55 100644
--- a/packages/stage-ui/src/libs/providers/validators/openai-compatible.test.ts
+++ b/packages/stage-ui/src/libs/providers/validators/openai-compatible.test.ts
@@ -1,4 +1,8 @@
-import { beforeEach, describe, expect, it, vi } from 'vitest'
+import type { ComposerTranslation } from 'vue-i18n'
+
+import type { ProviderExtraMethods, ProviderInstance } from '../types'
+
+import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest'
 
 import { createOpenAICompatibleValidators } from './openai-compatible'
 
@@ -18,28 +22,68 @@ vi.mock('@xsai/model', () => ({
   listModels: listModelsMock,
 }))
 
+const mockT = vi.fn((key: string) => key) as unknown as ComposerTranslation
+
 function getProviderValidators(options?: Parameters<typeof createOpenAICompatibleValidators>[0]) {
   const validators = createOpenAICompatibleValidators(options)
 
-  return (validators?.validateProvider || []).map(create => create({
-    t: (input: string) => input,
-  } as any))
+  return (validators?.validateProvider || []).map(create => create({ t: mockT }))
 }
 
+interface TestConfig { apiKey?: string, baseUrl?: string }
+
 describe('createOpenAICompatibleValidators', () => {
-  const config = {
+  const config: TestConfig = {
     apiKey: 'test-key',
     baseUrl: 'https://example.com/v1/',
   }
-  const provider = {
+  const provider: ProviderInstance = {
     model: () => ({
       apiKey: config.apiKey,
       baseURL: config.baseUrl,
     }),
-  }
+  } as ProviderInstance
+  const providerExtra: ProviderExtraMethods<TestConfig> = {}
+
+  let fetchMock: ReturnType<typeof vi.fn>
 
   beforeEach(() => {
     vi.clearAllMocks()
+    fetchMock = vi.fn().mockResolvedValue(new Response('{}', { status: 200 }))
+    vi.stubGlobal('fetch', fetchMock)
+  })
+
+  afterEach(() => {
+    vi.unstubAllGlobals()
+  })
+
+  it('connectivity check uses lightweight fetch instead of generateText', async () => {
+    const [connectivityValidator] = getProviderValidators({
+      checks: ['connectivity'],
+    })
+
+    const result = await connectivityValidator.validator(config, provider, providerExtra, { t: mockT })
+
+    expect(result.valid).toBe(true)
+    expect(generateTextMock).not.toHaveBeenCalled()
+    expect(fetchMock).toHaveBeenCalledWith(
+      'https://example.com/v1/models',
+      expect.objectContaining({ method: 'GET' }),
+    )
+  })
+
+  it('connectivity check fails on network error', async () => {
+    fetchMock.mockRejectedValue(new TypeError('fetch failed'))
+
+    const [connectivityValidator] = getProviderValidators({
+      checks: ['connectivity'],
+    })
+
+    const result = await connectivityValidator.validator(config, provider, providerExtra, { t: mockT })
+
+    expect(result.valid).toBe(false)
+    expect(result.reason).toContain('Connectivity check failed')
+    expect(generateTextMock).not.toHaveBeenCalled()
   })
 
   it('does not probe chat completions with a synthetic fallback model', async () => {
@@ -49,11 +93,10 @@ describe('createOpenAICompatibleValidators', () => {
       checks: ['connectivity', 'chat_completions'],
     })
 
-    const connectivityResult = await connectivityValidator.validator(config, provider as any, undefined as any, undefined as any)
-    const chatResult = await chatValidator.validator(config, provider as any, undefined as any, undefined as any)
+    const connectivityResult = await connectivityValidator.validator(config, provider, providerExtra, { t: mockT })
+    const chatResult = await chatValidator.validator(config, provider, providerExtra, { t: mockT })
 
-    expect(connectivityResult.valid).toBe(false)
-    expect(connectivityResult.reason).toContain('No model available for validation.')
+    expect(connectivityResult.valid).toBe(true)
     expect(chatResult.valid).toBe(false)
     expect(chatResult.reason).toContain('No model available for validation.')
     expect(generateTextMock).not.toHaveBeenCalled()
@@ -67,11 +110,20 @@ describe('createOpenAICompatibleValidators', () => {
       allowValidationWithoutModel: true,
     })
 
-    const connectivityResult = await connectivityValidator.validator(config, provider as any, undefined as any, undefined as any)
-    const chatResult = await chatValidator.validator(config, provider as any, undefined as any, undefined as any)
+    const connectivityResult = await connectivityValidator.validator(config, provider, providerExtra, { t: mockT })
+    const chatResult = await chatValidator.validator(config, provider, providerExtra, { t: mockT })
 
     expect(connectivityResult.valid).toBe(true)
     expect(chatResult.valid).toBe(true)
     expect(generateTextMock).not.toHaveBeenCalled()
   })
+
+  it('default checks do not include chat_completions', () => {
+    const validators = getProviderValidators()
+    const ids = validators.map(v => v.id)
+
+    expect(ids).toContain('openai-compatible:check-connectivity')
+    expect(ids).toContain('openai-compatible:check-model-list')
+    expect(ids).not.toContain('openai-compatible:check-chat-completions')
+  })
 })
diff --git a/packages/stage-ui/src/libs/providers/validators/openai-compatible.ts b/packages/stage-ui/src/libs/providers/validators/openai-compatible.ts
index 71bce86d2..c33ad9e30 100644
--- a/packages/stage-ui/src/libs/providers/validators/openai-compatible.ts
+++ b/packages/stage-ui/src/libs/providers/validators/openai-compatible.ts
@@ -103,7 +103,7 @@ async function pickValidationModel<TConfig extends { apiKey?: string | null, bas
 export function createOpenAICompatibleValidators<TConfig extends { apiKey?: string, baseUrl?: string }>(
   options?: OpenAICompatibleValidationOptions<TConfig>,
 ): ProviderDefinition<TConfig>['validators'] {
-  const checks = options?.checks ?? ['connectivity', 'model_list', 'chat_completions']
+  const checks = options?.checks ?? ['connectivity', 'model_list']
   const additionalHeaders = options?.additionalHeaders
   const missingValidationModelReason = 'No model available for validation. Configure a model manually and try again.'
 
@@ -240,21 +240,41 @@ export function createOpenAICompatibleValidators<TConfig extends { apiKey?: stri
       id: 'openai-compatible:check-connectivity',
       name: t('settings.pages.providers.catalog.edit.validators.openai-compatible.check-connectivity.title'),
       schedule: options?.schedule,
-      validator: async (config, provider, providerExtra, contextOptions) => {
+      validator: async (config) => {
         const errors: Array<{ error: unknown }> = []
-        const result = await getChatCheckResult(
-          config,
-          provider,
-          providerExtra,
-          contextOptions as { validationCache?: Map<string, unknown> } | undefined,
-        )
-        if (!result.connectivityOk) {
-          const errorMessage = result.errorMessage || 'Unknown error.'
+        const baseUrl = String(config.baseUrl ?? '')
+        const modelsUrl = baseUrl.endsWith('/') ? `${baseUrl}models` : `${baseUrl}/models`
+        const controller = new AbortController()
+        const timeout = setTimeout(() => controller.abort(), 10_000)
+
+        try {
+          const response = await fetch(modelsUrl, {
+            method: 'GET',
+            headers: {
+              ...(config.apiKey ? { Authorization: `Bearer ${config.apiKey}` } : {}),
+              ...additionalHeaders,
+            },
+            signal: controller.signal,
+          })
+
+          if (response.status >= 500) {
+            const errorMessage = `Server error: HTTP ${response.status}`
+            const reason = options?.connectivityFailureReason
+              ? options.connectivityFailureReason({ config, error: new Error(errorMessage), errorMessage })
+              : `Connectivity check failed: ${errorMessage}`
+            errors.push({ error: new Error(reason) })
+          }
+        }
+        catch (e) {
+          const errorMessage = errorMessageFrom(e) || 'Unknown error.'
           const reason = options?.connectivityFailureReason
-            ? options.connectivityFailureReason({ config, error: result.error, errorMessage })
+            ? options.connectivityFailureReason({ config, error: e, errorMessage })
             : `Connectivity check failed: ${errorMessage}`
           errors.push({ error: new Error(reason) })
         }
+        finally {
+          clearTimeout(timeout)
+        }
 
         return {
           errors,