diff --git a/tests/proxy_e2e_anthropic_messages_tests/test_config.yaml b/tests/proxy_e2e_anthropic_messages_tests/test_config.yaml
index dfdc6637cb..e9abb2f0cc 100644
--- a/tests/proxy_e2e_anthropic_messages_tests/test_config.yaml
+++ b/tests/proxy_e2e_anthropic_messages_tests/test_config.yaml
@@ -1,4 +1,8 @@
 model_list:
+  - model_name: claude-sonnet-4-5-20250929
+    litellm_params:
+      model: "anthropic/claude-sonnet-4-5-20250929"
+
   - model_name: bedrock-claude-sonnet-3.5
     litellm_params:
       model: "bedrock/us.anthropic.claude-3-5-sonnet-20240620-v1:0"