ModuleNotFoundError: No module named 'langchain.chat_models'

LangChain 0.2+ separated integrations into partner packages (e.g. `langchain_openai`, `langchain_anthropic`, `langchain_community`).

💡 Verified Solution

Install and import partner packages (e.g. `from langchain_openai import ChatOpenAI`).

Patch / Unified Code Diff:

--- old.py
+++ new.py
@@ -1,1 +1,1 @@
-from langchain.chat_models import ChatOpenAI
+from langchain_openai import ChatOpenAI

Official Primary Reference: https://python.langchain.com/v0.2/docs/versions/v0_2/

🧪 Sandbox Execution Evidence

Exit Code: 0

Tests Passed: 1 / 1

Confidence: 98%

Protocol: MCP 2026

Connect the canonical endpoint https://mcp.synapsemesh.dev in Claude, ChatGPT, or Cursor.