diff --git a/src/deepagents/model.py b/src/deepagents/model.py
index 92b75b6c..7a6982ae 100644
--- a/src/deepagents/model.py
+++ b/src/deepagents/model.py
@@ -2,4 +2,4 @@
 
 
 def get_default_model():
-    return ChatAnthropic(model_name="claude-sonnet-4-20250514", max_tokens=64000)
+    return ChatAnthropic(model_name="claude-sonnet-4-5-20250929", max_tokens=64000)