diff --git a/langchain/callbacks/openai_info.py b/langchain/callbacks/openai_info.py
index 549720e7c4d..37c0ee10da9 100644
--- a/langchain/callbacks/openai_info.py
+++ b/langchain/callbacks/openai_info.py
@@ -96,7 +96,7 @@ def get_openai_token_cost_for_model(
             f"Unknown model: {model_name}. Please provide a valid OpenAI model name."
             "Known models are: " + ", ".join(MODEL_COST_PER_1K_TOKENS.keys())
         )
-    return MODEL_COST_PER_1K_TOKENS[model_name] * num_tokens / 1000
+    return MODEL_COST_PER_1K_TOKENS[model_name] * (num_tokens / 1000)
 
 
 class OpenAICallbackHandler(BaseCallbackHandler):