diff --git a/src/modules/aix/server/dispatch/chatGenerate/chatGenerate.dispatch.ts b/src/modules/aix/server/dispatch/chatGenerate/chatGenerate.dispatch.ts
index b11e59fbc..bb262c06f 100644
--- a/src/modules/aix/server/dispatch/chatGenerate/chatGenerate.dispatch.ts
+++ b/src/modules/aix/server/dispatch/chatGenerate/chatGenerate.dispatch.ts
@@ -63,7 +63,6 @@ export function createChatGenerateDispatch(access: AixAPI_Access, model: AixAPI_
         modelIdForBetaFeatures: model.id,
         vndAntWebFetch: model.vndAntWebFetch === 'auto',
         vndAnt1MContext: model.vndAnt1MContext === true,
-        vndAntEffort: !!model.vndAntEffort,
         enableSkills: !!model.vndAntSkills,
         enableFastMode: model.vndAntInfSpeed === 'fast',
         enableStrictOutputs: !!model.strictJsonOutput || !!model.strictToolInvocations, // [Anthropic, 2025-11-13] for both JSON output and grammar-constrained tool invocations inputs
diff --git a/src/modules/llms/server/anthropic/anthropic.access.ts b/src/modules/llms/server/anthropic/anthropic.access.ts
index 1a53657dd..f5ef5a958 100644
--- a/src/modules/llms/server/anthropic/anthropic.access.ts
+++ b/src/modules/llms/server/anthropic/anthropic.access.ts
@@ -82,7 +82,6 @@ export type AnthropicHeaderOptions = {
   modelIdForBetaFeatures?: string;
   vndAntWebFetch?: boolean;
   vndAnt1MContext?: boolean;
-  vndAntEffort?: boolean; // [Anthropic, effort-2025-11-24]
   enableSkills?: boolean;
   enableCodeExecution?: boolean;
   enableFastMode?: boolean; // [Anthropic, fast-mode-2026-02-01]
@@ -173,10 +172,6 @@ function _anthropicHeaders(options?: AnthropicHeaderOptions): Record<string, str
   if (options?.enableFastMode)
     betaFeatures.push('fast-mode-2026-02-01');
 
-  // [Anthropic, 2025-11-24] Add beta feature for effort parameter (Claude Opus 4.5+)
-  if (options?.vndAntEffort)
-    betaFeatures.push('effort-2025-11-24');
-
   // [Anthropic, 2025-11-24] Add beta feature for Advanced Tool Use (Tool Search Tool, Programmatic Tool Calling)
   // Same beta header covers both features: tool discovery and programmatic calling from code execution
   if (options?.enableToolSearch || options?.enableProgrammaticToolCalling)