diff --git a/src/constants.ts b/src/constants.ts
index 70ae3ae..3437608 100644
--- a/src/constants.ts
+++ b/src/constants.ts
@@ -5,7 +5,7 @@
 /**
  * Default model ID to use when no model is specified
  */
-export const DEFAULT_MODEL_ID = "sonnet-4.5";
+export const DEFAULT_MODEL_ID = "sonnet";
 
 /**
  * Default agent name when creating a new agent