diff --git a/env.example b/env.example
index 245aa133..375a9236 100644
--- a/env.example
+++ b/env.example
@@ -5,6 +5,7 @@ GOOGLE_API_KEY=your-api-key
 XAI_API_KEY=your-api-key
 OPENROUTER_API_KEY=your-api-key
 MOONSHOT_API_KEY=your-api-key
+DEEPSEEK_API_KEY=your-api-key
 
 # Ollama (Local LLM)
 OLLAMA_BASE_URL=http://127.0.0.1:11434
diff --git a/src/components/ModelSelector.tsx b/src/components/ModelSelector.tsx
index ad75e557..03c3c9d2 100644
--- a/src/components/ModelSelector.tsx
+++ b/src/components/ModelSelector.tsx
@@ -53,6 +53,14 @@ const PROVIDERS: Provider[] = [
       { id: 'kimi-k2-5', displayName: 'Kimi K2.5' },
     ],
   },
+  {
+    displayName: 'DeepSeek',
+    providerId: 'deepseek',
+    models: [
+      { id: 'deepseek-chat', displayName: 'DeepSeek V3' },
+      { id: 'deepseek-reasoner', displayName: 'DeepSeek R1' },
+    ],
+  },
   {
     displayName: 'OpenRouter',
     providerId: 'openrouter',
diff --git a/src/model/llm.ts b/src/model/llm.ts
index c47cfb0d..c892c5b8 100644
--- a/src/model/llm.ts
+++ b/src/model/llm.ts
@@ -23,6 +23,7 @@ const FAST_MODELS: Record<string, string> = {
   xai: 'grok-4-1-fast-reasoning',
   openrouter: 'openrouter:openai/gpt-4o-mini',
   moonshot: 'kimi-k2-5',
+  deepseek: 'deepseek-chat',
 };
 
 /**
@@ -101,6 +102,15 @@ const MODEL_PROVIDERS: Record<string, ModelFactory> = {
         baseURL: 'https://api.moonshot.cn/v1',
       },
     }),
+  'deepseek-': (name, opts) =>
+    new ChatOpenAI({
+      model: name,
+      ...opts,
+      apiKey: getApiKey('DEEPSEEK_API_KEY', 'DeepSeek'),
+      configuration: {
+        baseURL: 'https://api.deepseek.com',
+      },
+    }),
   'ollama:': (name, opts) =>
     new ChatOllama({
       model: name.replace(/^ollama:/, ''),
diff --git a/src/utils/env.ts b/src/utils/env.ts
index c788ab5d..6f095f82 100644
--- a/src/utils/env.ts
+++ b/src/utils/env.ts
@@ -15,6 +15,7 @@ const PROVIDERS: Record<string, ProviderConfig> = {
   anthropic: { displayName: 'Anthropic', apiKeyEnvVar: 'ANTHROPIC_API_KEY' },
   google: { displayName: 'Google', apiKeyEnvVar: 'GOOGLE_API_KEY' },
   moonshot: { displayName: 'Moonshot', apiKeyEnvVar: 'MOONSHOT_API_KEY' },
+  deepseek: { displayName: 'DeepSeek', apiKeyEnvVar: 'DEEPSEEK_API_KEY' },
   openrouter: { displayName: 'OpenRouter', apiKeyEnvVar: 'OPENROUTER_API_KEY' },
   ollama: { displayName: 'Ollama' },
 };