diff --git a/packages/core/src/services/image-model/defaults.ts b/packages/core/src/services/image-model/defaults.ts
index e4ab0e45..751aa6f3 100644
--- a/packages/core/src/services/image-model/defaults.ts
+++ b/packages/core/src/services/image-model/defaults.ts
@@ -14,6 +14,7 @@ const IMAGE_PROVIDER_ENV_KEYS = {
   seedream: ['VITE_SEEDREAM_API_KEY', 'VITE_ARK_API_KEY'],
   dashscope: ['VITE_DASHSCOPE_API_KEY'],
   modelscope: ['VITE_MODELSCOPE_API_KEY'],
+  ollama: [],
   cloudflare: ['VITE_CF_API_TOKEN'],
   grok: ['VITE_GROK_API_KEY', 'VITE_XAI_API_KEY']
 } as const
@@ -38,6 +39,7 @@ const IMAGE_BUILTIN_CONFIGS: readonly BuiltinImageConfigSpec[] = [
   { providerId: 'seedream', configId: 'image-seedream-50-lite', modelId: 'doubao-seedream-5-0-260128', displayName: 'Doubao Seedream 5.0 Lite' },
   { providerId: 'dashscope', configId: 'image-dashscope' },
   { providerId: 'modelscope', configId: 'image-modelscope' },
+  { providerId: 'ollama', configId: 'image-ollama' },
   { providerId: 'cloudflare', configId: 'image-cloudflare-flux-klein' },
   { providerId: 'grok', configId: 'image-grok-imagine' }
 ] as const
@@ -63,6 +65,7 @@ const IMAGE_EXTRA_CONNECTION_ENV_KEYS: Record<string, Record<string, string[]>>
  * 某些 Provider 需要多个字段都存在时才视为可用
  */
 const IMAGE_REQUIRED_CONNECTION_FIELDS: Record<string, string[]> = {
+  ollama: [],
   cloudflare: ['apiKey', 'accountId']
 }
 
@@ -74,6 +77,18 @@ function getFirstEnvValue(envKeys: readonly string[]): string {
   return ''
 }
 
+function hasConnectionValue(value: unknown): boolean {
+  return typeof value === 'string' ? value.trim().length > 0 : !!value
+}
+
+function shouldEnableFromRequiredFields(
+  connectionConfig: Record<string, unknown>,
+  requiredConnectionFields: readonly string[]
+): boolean {
+  return requiredConnectionFields.length > 0
+    && requiredConnectionFields.every(field => hasConnectionValue(connectionConfig[field]))
+}
+
 /**
  * 图像模型默认配置生成器
  * 返回完整的自包含配置对象，包含 provider 和 model 完整信息
@@ -123,10 +138,7 @@ export function getDefaultImageModels(registry?: IImageAdapterRegistry): Record<
     }
 
     const requiredConnectionFields = IMAGE_REQUIRED_CONNECTION_FIELDS[providerId] || ['apiKey']
-    const enabled = requiredConnectionFields.every(field => {
-      const value = connectionConfig[field]
-      return typeof value === 'string' ? value.trim().length > 0 : !!value
-    })
+    const enabled = shouldEnableFromRequiredFields(connectionConfig, requiredConnectionFields)
 
     result[builtinConfig.configId] = {
       id: builtinConfig.configId,
diff --git a/packages/core/src/services/model/defaults.ts b/packages/core/src/services/model/defaults.ts
index 2274dfee..36203512 100644
--- a/packages/core/src/services/model/defaults.ts
+++ b/packages/core/src/services/model/defaults.ts
@@ -19,6 +19,7 @@ const PROVIDER_ENV_KEYS = {
   dashscope: ['VITE_DASHSCOPE_API_KEY'],
   openrouter: ['VITE_OPENROUTER_API_KEY'],
   modelscope: ['VITE_MODELSCOPE_API_KEY'],
+  ollama: [],
   minimax: ['VITE_MINIMAX_API_KEY'],
   cloudflare: ['VITE_CF_API_TOKEN'],
   grok: ['VITE_GROK_API_KEY', 'VITE_XAI_API_KEY']
@@ -31,6 +32,7 @@ const PROVIDER_EXTRA_CONNECTION_ENV_KEYS: Record<string, Record<string, string[]
 };
 
 const PROVIDER_REQUIRED_CONNECTION_FIELDS: Record<string, string[]> = {
+  ollama: [],
   cloudflare: ['apiKey', 'accountId']
 };
 
@@ -42,6 +44,18 @@ function getFirstEnvValue(envKeys: readonly string[]): string {
   return '';
 }
 
+function hasConnectionValue(value: unknown): boolean {
+  return typeof value === 'string' ? value.trim().length > 0 : !!value;
+}
+
+function shouldEnableFromRequiredFields(
+  connectionConfig: Record<string, unknown>,
+  requiredConnectionFields: readonly string[]
+): boolean {
+  return requiredConnectionFields.length > 0
+    && requiredConnectionFields.every((field) => hasConnectionValue(connectionConfig[field]));
+}
+
 /**
  * 获取所有内置模型的 ID 列表
  * 包括 PROVIDER_ENV_KEYS 中的所有 Provider 和 'custom'
@@ -83,10 +97,7 @@ export function getDefaultTextModels(registry?: ITextAdapterRegistry): Record<st
     // 使用模型的默认参数值初始化 paramOverrides
     const defaultParamValues = defaultModel.defaultParameterValues || {};
     const requiredConnectionFields = PROVIDER_REQUIRED_CONNECTION_FIELDS[providerId] || ['apiKey'];
-    const enabled = requiredConnectionFields.every((field) => {
-      const value = connectionConfig[field];
-      return typeof value === 'string' ? value.trim().length > 0 : !!value;
-    });
+    const enabled = shouldEnableFromRequiredFields(connectionConfig, requiredConnectionFields);
 
     result[providerId] = {
       id: provider.id,
@@ -103,9 +114,16 @@ export function getDefaultTextModels(registry?: ITextAdapterRegistry): Record<st
   // Custom 单独处理（baseURL 和 model 来自环境变量）
   const openaiCompatibleAdapter = adapterRegistry.getAdapter('openai-compatible');
   const customApiKey = getEnvVar('VITE_CUSTOM_API_KEY').trim();
-  const customBaseURL = getEnvVar('VITE_CUSTOM_API_BASE_URL');
-  const customModelId = getEnvVar('VITE_CUSTOM_API_MODEL') || 'custom-model';
+  const customBaseURL = getEnvVar('VITE_CUSTOM_API_BASE_URL').trim();
+  const rawCustomModelId = getEnvVar('VITE_CUSTOM_API_MODEL').trim();
+  const customModelId = rawCustomModelId || 'custom-model';
   const rawCustomHeaders = getEnvVar('VITE_CUSTOM_API_HEADERS');
+  const hasExplicitCustomConfig = [
+    customApiKey,
+    customBaseURL,
+    rawCustomModelId,
+    rawCustomHeaders
+  ].some((value) => value.trim().length > 0);
   let customHeaders: Record<string, string> | undefined;
   if (rawCustomHeaders) {
     try {
@@ -133,7 +151,7 @@ export function getDefaultTextModels(registry?: ITextAdapterRegistry): Record<st
   result.custom = {
     id: 'custom',
     name: 'OpenAI Compatible (Custom)',
-    enabled: true,
+    enabled: hasExplicitCustomConfig,
     providerMeta: openaiCompatibleAdapter.getProvider(),
     modelMeta: customModelMeta,
     connectionConfig: {
diff --git a/packages/core/tests/unit/image/image-default-models.test.ts b/packages/core/tests/unit/image/image-default-models.test.ts
index c1e695d6..3b359e53 100644
--- a/packages/core/tests/unit/image/image-default-models.test.ts
+++ b/packages/core/tests/unit/image/image-default-models.test.ts
@@ -86,6 +86,18 @@ describe('default image models', () => {
     expect(models['image-openrouter-nanobanana'].enabled).toBe(false)
   })
 
+  it('includes Ollama but keeps it disabled without explicit user configuration', () => {
+    const models = getDefaultImageModels(registry)
+    const ollamaConfig = models['image-ollama']
+
+    expect(ollamaConfig).toBeDefined()
+    expect(ollamaConfig.providerId).toBe('ollama')
+    expect(ollamaConfig.provider.requiresApiKey).toBe(false)
+    expect(ollamaConfig.connectionConfig?.apiKey).toBe('')
+    expect(ollamaConfig.connectionConfig?.baseURL).toBe('http://localhost:11434/v1')
+    expect(ollamaConfig.enabled).toBe(false)
+  })
+
   it('OpenRouter model has correct provider and model information', () => {
     process.env.VITE_OPENROUTER_API_KEY = 'test-key'
     const models = getDefaultImageModels(registry)
diff --git a/packages/core/tests/unit/model/defaults.test.ts b/packages/core/tests/unit/model/defaults.test.ts
index 1bc33f85..767b6cbf 100644
--- a/packages/core/tests/unit/model/defaults.test.ts
+++ b/packages/core/tests/unit/model/defaults.test.ts
@@ -123,6 +123,19 @@ describe('model defaults provider env mapping', () => {
     expect(builtinModelIds).toContain('cloudflare')
   })
 
+  it('should include ollama but keep it disabled without explicit user configuration', () => {
+    const builtinModelIds = getBuiltinModelIds()
+    const models = getDefaultTextModels()
+
+    expect(builtinModelIds).toContain('ollama')
+    expect(models.ollama).toBeDefined()
+    expect(models.ollama.providerMeta.id).toBe('ollama')
+    expect(models.ollama.providerMeta.requiresApiKey).toBe(false)
+    expect(models.ollama.connectionConfig.apiKey).toBe('')
+    expect(models.ollama.connectionConfig.baseURL).toBe('http://localhost:11434/v1')
+    expect(models.ollama.enabled).toBe(false)
+  })
+
   it('should include cloudflare config and keep it disabled when credentials are empty', () => {
     const models = getDefaultTextModels()
 
@@ -155,17 +168,26 @@ describe('model defaults provider env mapping', () => {
     expect(models.cloudflare.connectionConfig.accountId).toBe('')
   })
 
-  it('should expose the custom preset as OpenAI-compatible with chat completions by default', () => {
+  it('should expose the custom preset as OpenAI-compatible with chat completions but keep it disabled by default', () => {
     const models = getDefaultTextModels()
 
     expect(models.custom).toBeDefined()
     expect(models.custom.providerMeta.id).toBe('openai-compatible')
     expect(models.custom.providerMeta.name).toBe('OpenAI Compatible (Custom)')
-    expect(models.custom.enabled).toBe(true)
+    expect(models.custom.enabled).toBe(false)
     expect(models.custom.connectionConfig.apiKey).toBe('')
     expect(models.custom.connectionConfig.requestStyle).toBe('chat_completions')
   })
 
+  it('should enable the custom preset when explicit custom connection config is provided', () => {
+    process.env.VITE_CUSTOM_API_BASE_URL = 'http://localhost:11434/v1'
+
+    const models = getDefaultTextModels()
+
+    expect(models.custom.enabled).toBe(true)
+    expect(models.custom.connectionConfig.baseURL).toBe('http://localhost:11434/v1')
+  })
+
   it('should expose VITE_CUSTOM_API_HEADERS on the custom preset connection config', () => {
     process.env.VITE_CUSTOM_API_HEADERS = '{"x-auth-token":"gateway-token"}'