diff --git a/rdagent/oai/backend/base.py b/rdagent/oai/backend/base.py
index c15691f4..7a632165 100644
--- a/rdagent/oai/backend/base.py
+++ b/rdagent/oai/backend/base.py
@@ -242,6 +242,17 @@ class APIBackend(ABC):
         )
         return messages
 
+    def _build_log_messages(self, messages: list[dict[str, Any]]) -> str:
+        log_messages = ""
+        for m in messages:
+            log_messages += (
+                f"\n{LogColors.MAGENTA}{LogColors.BOLD}Role:{LogColors.END}"
+                f"{LogColors.CYAN}{m['role']}{LogColors.END}\n"
+                f"{LogColors.MAGENTA}{LogColors.BOLD}Content:{LogColors.END} "
+                f"{LogColors.CYAN}{m['content']}{LogColors.END}\n"
+            )
+        return log_messages
+
     def build_messages_and_create_chat_completion(  # type: ignore[no-untyped-def]
         self,
         user_prompt: str,
diff --git a/rdagent/oai/backend/deprec.py b/rdagent/oai/backend/deprec.py
index 3011385f..a96d8814 100644
--- a/rdagent/oai/backend/deprec.py
+++ b/rdagent/oai/backend/deprec.py
@@ -283,17 +283,6 @@ class DeprecBackend(APIBackend):
 
         return [content_to_embedding_dict[content] for content in input_content_list]
 
-    def _build_log_messages(self, messages: list[dict[str, Any]]) -> str:
-        log_messages = ""
-        for m in messages:
-            log_messages += (
-                f"\n{LogColors.MAGENTA}{LogColors.BOLD}Role:{LogColors.END}"
-                f"{LogColors.CYAN}{m['role']}{LogColors.END}\n"
-                f"{LogColors.MAGENTA}{LogColors.BOLD}Content:{LogColors.END} "
-                f"{LogColors.CYAN}{m['content']}{LogColors.END}\n"
-            )
-        return log_messages
-
     def _create_chat_completion_inner_function(  # type: ignore[no-untyped-def] # noqa: C901, PLR0912, PLR0915
         self,
         messages: list[dict[str, Any]],
diff --git a/rdagent/oai/backend/litellm.py b/rdagent/oai/backend/litellm.py
index c13f976e..86dd9719 100644
--- a/rdagent/oai/backend/litellm.py
+++ b/rdagent/oai/backend/litellm.py
@@ -85,6 +85,7 @@ class LiteLLMAPIBackend(APIBackend):
             f"{LogColors.GREEN}Using chat model{LogColors.END} {LITELLM_SETTINGS.chat_model}", tag="llm_messages"
         )
 
+        logger.info(self._build_log_messages(messages), tag="llm_messages")
         if LITELLM_SETTINGS.chat_stream:
             logger.info(f"{LogColors.BLUE}assistant:{LogColors.END}", tag="llm_messages")
             content = ""