diff --git a/libs/langchain/langchain/llms/vertexai.py b/libs/langchain/langchain/llms/vertexai.py
index da85f79edb..35fa573466 100644
--- a/libs/langchain/langchain/llms/vertexai.py
+++ b/libs/langchain/langchain/llms/vertexai.py
@@ -122,6 +122,11 @@ class _VertexAICommon(BaseModel):
             return enforce_stop_tokens(text, stop)
         return text
 
+    @property
+    def _identifying_params(self) -> Dict[str, Any]:
+        """Get the identifying parameters."""
+        return {**{"model_name": self.model_name}, **self._default_params}
+
     @property
     def _llm_type(self) -> str:
         return "vertexai"