diff --git a/packages/ai/src/utils/models/providers/anthropic.ts b/packages/ai/src/utils/models/providers/anthropic.ts
index f4b611eaf..baa91198b 100644
--- a/packages/ai/src/utils/models/providers/anthropic.ts
+++ b/packages/ai/src/utils/models/providers/anthropic.ts
@@ -4,7 +4,7 @@ import { wrapAISDKModel } from 'braintrust';
 export const anthropicModel = (modelId: string) => {
   const anthropic = createAnthropic({
     headers: {
-      'anthropic-beta': 'fine-grained-tool-streaming-2025-05-14',
+      'anthropic-beta': 'fine-grained-tool-streaming-2025-05-14,extended-cache-ttl-2025-04-11',
     },
     fetch: ((url, options) => {
       if (options?.body) {
diff --git a/packages/ai/src/utils/models/providers/vertex.ts b/packages/ai/src/utils/models/providers/vertex.ts
index 3c2cafcbc..3f05bc63b 100644
--- a/packages/ai/src/utils/models/providers/vertex.ts
+++ b/packages/ai/src/utils/models/providers/vertex.ts
@@ -32,7 +32,7 @@ export const vertexModel = (modelId: string): LanguageModelV1 => {
           },
         },
         headers: {
-          'anthropic-beta': 'fine-grained-tool-streaming-2025-05-14',
+          'anthropic-beta': 'fine-grained-tool-streaming-2025-05-14,extended-cache-ttl-2025-04-11',
         },
         fetch: ((url, options) => {
           if (options?.body) {