diff --git a/src/renderer/src/aiCore/prepareParams/header.ts b/src/renderer/src/aiCore/prepareParams/header.ts
index 615f07db3..480f13314 100644
--- a/src/renderer/src/aiCore/prepareParams/header.ts
+++ b/src/renderer/src/aiCore/prepareParams/header.ts
@@ -7,7 +7,7 @@ import { isAwsBedrockProvider, isVertexProvider } from '@renderer/utils/provider
 // https://docs.claude.com/en/docs/build-with-claude/extended-thinking#interleaved-thinking
 const INTERLEAVED_THINKING_HEADER = 'interleaved-thinking-2025-05-14'
 // https://docs.claude.com/en/docs/build-with-claude/context-windows#1m-token-context-window
-const CONTEXT_100M_HEADER = 'context-1m-2025-08-07'
+// const CONTEXT_100M_HEADER = 'context-1m-2025-08-07'
 // https://docs.cloud.google.com/vertex-ai/generative-ai/docs/partner-models/claude/web-search
 const WEBSEARCH_HEADER = 'web-search-2025-03-05'
 
@@ -25,7 +25,9 @@ export function addAnthropicHeaders(assistant: Assistant, model: Model): string[
     if (isVertexProvider(provider) && assistant.enableWebSearch) {
       anthropicHeaders.push(WEBSEARCH_HEADER)
     }
-    anthropicHeaders.push(CONTEXT_100M_HEADER)
+    // We may add it by user preference in assistant.settings instead of always adding it.
+    // See #11540, #11397
+    // anthropicHeaders.push(CONTEXT_100M_HEADER)
   }
   return anthropicHeaders
 }