diff --git a/libs/langchain/langchain/chat_models/base.py b/libs/langchain/langchain/chat_models/base.py
index 1a2ead99043..1b73f153d82 100644
--- a/libs/langchain/langchain/chat_models/base.py
+++ b/libs/langchain/langchain/chat_models/base.py
@@ -464,7 +464,7 @@ _SUPPORTED_PROVIDERS = {
 
 
 def _attempt_infer_model_provider(model_name: str) -> Optional[str]:
-    if any(model_name.startswith(pre) for pre in ("gpt-3", "gpt-4", "o1")):
+    if any(model_name.startswith(pre) for pre in ("gpt-3", "gpt-4", "o1", "o3")):
         return "openai"
     elif model_name.startswith("claude"):
         return "anthropic"