diff --git a/openapi/agent-sdk.json b/openapi/agent-sdk.json
index 9ffcf521..60112b49 100644
--- a/openapi/agent-sdk.json
+++ b/openapi/agent-sdk.json
@@ -5347,7 +5347,7 @@
             "type": "boolean",
             "title": "Enable Encrypted Reasoning",
             "description": "If True, ask for ['reasoning.encrypted_content'] in Responses API include.",
-            "default": false
+            "default": true
           },
           "prompt_cache_retention": {
             "anyOf": [