diff --git a/src/server/__tests__/provider-presets.test.ts b/src/server/__tests__/provider-presets.test.ts
index 1f25fa6c..a6aa898f 100644
--- a/src/server/__tests__/provider-presets.test.ts
+++ b/src/server/__tests__/provider-presets.test.ts
@@ -101,10 +101,12 @@ describe('provider presets API', () => {
     expect(jiekouai?.defaultModels.main).toBe('claude-sonnet-4-6')
     expect(jiekouai?.defaultModels.opus).toBe('claude-opus-4-7')
     expect(jiekouai?.defaultEnv?.ANTHROPIC_DEFAULT_SONNET_MODEL_SUPPORTED_CAPABILITIES).toBe('none')
+    expect(jiekouai?.modelContextWindows?.['claude-sonnet-4-6']).toBe(1000000)
     expect(shengsuanyun?.baseUrl).toBe('https://router.shengsuanyun.com/api')
     expect(shengsuanyun?.authStrategy).toBe('auth_token')
     expect(shengsuanyun?.defaultModels.main).toBe('anthropic/claude-sonnet-4.6')
     expect(shengsuanyun?.defaultModels.haiku).toBe('anthropic/claude-haiku-4.5:thinking')
+    expect(shengsuanyun?.modelContextWindows?.['anthropic/claude-sonnet-4.6']).toBe(1000000)
   })
 
   test('configured presets can expose optional API key and promo metadata', () => {
diff --git a/src/server/__tests__/providers.test.ts b/src/server/__tests__/providers.test.ts
index 1cbc2a05..7cd651c6 100644
--- a/src/server/__tests__/providers.test.ts
+++ b/src/server/__tests__/providers.test.ts
@@ -462,7 +462,7 @@ describe('ProviderService', () => {
       expect(env.CLAUDE_CODE_DISABLE_NONESSENTIAL_TRAFFIC).toBe('1')
       expect(env.CLAUDE_CODE_AUTO_COMPACT_WINDOW).toBeUndefined()
       expect(JSON.parse(env.CLAUDE_CODE_MODEL_CONTEXT_WINDOWS)).toEqual({
-        'anthropic/claude-sonnet-4.6': 200000,
+        'anthropic/claude-sonnet-4.6': 1000000,
         'anthropic/claude-haiku-4.5:thinking': 200000,
         'anthropic/claude-opus-4.7': 1000000,
       })
@@ -472,7 +472,7 @@ describe('ProviderService', () => {
       expect(runtimeEnv.CLAUDE_CODE_DISABLE_NONESSENTIAL_TRAFFIC).toBe('1')
       expect(runtimeEnv.CLAUDE_CODE_AUTO_COMPACT_WINDOW).toBeUndefined()
       expect(JSON.parse(runtimeEnv.CLAUDE_CODE_MODEL_CONTEXT_WINDOWS)).toEqual({
-        'anthropic/claude-sonnet-4.6': 200000,
+        'anthropic/claude-sonnet-4.6': 1000000,
         'anthropic/claude-haiku-4.5:thinking': 200000,
         'anthropic/claude-opus-4.7': 1000000,
       })
diff --git a/src/server/config/providerPresets.json b/src/server/config/providerPresets.json
index b91ed1a5..43495baf 100644
--- a/src/server/config/providerPresets.json
+++ b/src/server/config/providerPresets.json
@@ -136,7 +136,7 @@
       "ANTHROPIC_DEFAULT_SONNET_MODEL_SUPPORTED_CAPABILITIES": "none"
     },
     "modelContextWindows": {
-      "claude-sonnet-4-6": 200000,
+      "claude-sonnet-4-6": 1000000,
       "claude-haiku-4-5-20251001": 200000,
       "claude-haiku-4-5": 200000,
       "claude-opus-4-7": 1000000
@@ -165,7 +165,7 @@
       "ANTHROPIC_DEFAULT_SONNET_MODEL_SUPPORTED_CAPABILITIES": "none"
     },
     "modelContextWindows": {
-      "anthropic/claude-sonnet-4.6": 200000,
+      "anthropic/claude-sonnet-4.6": 1000000,
       "anthropic/claude-haiku-4.5:thinking": 200000,
       "anthropic/claude-opus-4.7": 1000000
     }