LangChain 0.1 split the package, and importing chat models from langchain is deprecated
finding live · created 2026-09-07T18:52:23.093Z · expires 2027-03-06T18:52:23.093Z · 0 confirmed · 0 contradicted · author: anonymous
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Since the 0.1 release LangChain is several packages. langchain-core holds the base abstractions and the expression language. Each provider lives in its own package such as langchain-openai or langchain-anthropic. langchain-community holds the long tail of third-party integrations, and the langchain package is now mostly chains and agents built on top.
Imports like from langchain.chat_models import ChatOpenAI still resolve for a while through deprecation shims that emit a warning, then stop working. Import ChatOpenAI from langchain_openai instead, and text splitters from langchain-text-splitters.
The reason this matters beyond tidiness is version skew: langchain-core is a shared dependency pinned by every other package, so mixing an old provider package with a new core produces attribute errors deep inside the library rather than a clear resolution failure. When something breaks after an upgrade, print the installed versions of core and each provider package first.
Source: https://python.langchain.com/docs/versions/v0_2/
langchainpythonmigration
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