diff --git a/.env.example b/.env.example
index be28bc2fa6..1c77a470e2 100644
--- a/.env.example
+++ b/.env.example
@@ -22,7 +22,7 @@ GOOGLE_MODELS=
 
 DEEPSEEK_API_KEY=
 DEEPSEEK_BASE_URL=
-# Example: deepseek-v4-pro,deepseek-v4-flash
+# Example: deepseek-v4-pro,deepseek-v4-pro[1m],deepseek-v4-flash
 DEEPSEEK_MODELS=
 
 QWEN_API_KEY=
@@ -53,18 +53,19 @@ DOUBAO_MODELS=
 
 OPENROUTER_API_KEY=
 OPENROUTER_BASE_URL=https://openrouter.ai/api/v1
-# Example: deepseek/deepseek-v4-pro,deepseek/deepseek-v4-flash
+# Example: deepseek/deepseek-v4-pro,deepseek/deepseek-v4-flash,grok-4.20-reasoning,grok-4.20,grok-4.20-multi-agent
 OPENROUTER_MODELS=
 
 GROK_API_KEY=
 GROK_BASE_URL=
+# Example: grok-4.20-reasoning,grok-4.20,grok-4.20-multi-agent
 GROK_MODELS=
 
 TENCENT_API_KEY=
 # Tencent TokenHub OpenAI-compatible endpoint. Hy3 is a model ID, not an env prefix.
 # TENCENT_HUNYUAN_* is also accepted as an alias.
 TENCENT_BASE_URL=https://tokenhub.tencentmaas.com/v1
-# Example: hy3-preview,hunyuan-2.0-thinking-20251109,hunyuan-2.0-instruct-20251111
+# Example: hy3-preview,hunyuan-2.0-thinking-20251109,hunyuan-2.0-instruct-20251111 (note: HY3 is a model name, not an env prefix)
 TENCENT_MODELS=
 
 XIAOMI_API_KEY=
diff --git a/lib/ai/providers.ts b/lib/ai/providers.ts
index 0d5ab6f83e..fcc4ba0b86 100644
--- a/lib/ai/providers.ts
+++ b/lib/ai/providers.ts
@@ -586,6 +586,22 @@ export const PROVIDERS: Record<ProviderId, ProviderConfig> = {
           },
         },
       },
+      {
+        id: 'deepseek-v4-pro[1m]',
+        name: 'DeepSeek V4 Pro (1M)',
+        contextWindow: 1048576,
+        outputWindow: 393216,
+        capabilities: {
+          streaming: true,
+          tools: true,
+          vision: false,
+          thinking: {
+            toggleable: true,
+            budgetAdjustable: true,
+            defaultEnabled: true,
+          },
+        },
+      },
       {
         id: 'deepseek-v4-flash',
         name: 'DeepSeek V4 Flash',
diff --git a/tests/ai/thinking-config.test.ts b/tests/ai/thinking-config.test.ts
index 118641780b..0fdce85561 100644
--- a/tests/ai/thinking-config.test.ts
+++ b/tests/ai/thinking-config.test.ts
@@ -71,7 +71,7 @@ describe('thinking config metadata', () => {
     expect(glmModels).not.toContain('glm-4.5-flash');
     expect(googleModels).toContain('gemini-3.1-pro-preview');
     expect(googleModels).not.toContain('gemini-3-pro-preview');
-    expect(deepseekModels).toEqual(['deepseek-v4-pro', 'deepseek-v4-flash']);
+    expect(deepseekModels).toEqual(['deepseek-v4-pro', 'deepseek-v4-pro[1m]', 'deepseek-v4-flash']);
     expect(hunyuanModels).toEqual(['hy3-preview']);
     expect(minimaxModels).toEqual(['MiniMax-M2.7']);
     expect(siliconflowModels).not.toContain('MiniMaxAI/MiniMax-M2');