# AN-2026-0651: LangChainDeprecationWarning "An updated version of the class exists in the langchain-openai package": langchain_community ChatOpenAI/OpenAI/OpenAIEmbeddings deprecated; use langchain-openai

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- id: AN-2026-0651 (version 1; cite https://breakwire.org/claim/AN-2026-0651/v/1)
- kind: deprecation · status: active · review: editor
- source: <https://github.com/langchain-ai/langchain-community/blob/f425a3ed1933173fb3694b81359d1519c4f82d36/libs/community/langchain_community/chat_models/openai.py#L181-L184>
- more sources: <https://github.com/langchain-ai/langchain/blob/5029a0f7dd203921b1015e0f51e8a6d6c34bce94/libs/core/langchain_core/_api/deprecation.py#L479-L568> <https://github.com/langchain-ai/docs/blob/16da01070643ffd33a7108029aabb7e9e74b61cd/src/oss/python/integrations/vectorstores/weaviate.mdx#L110> <https://github.com/langchain-ai/langchain-community/blob/f425a3ed1933173fb3694b81359d1519c4f82d36/libs/community/langchain_community/llms/openai.py> <https://github.com/langchain-ai/langchain-community/blob/f425a3ed1933173fb3694b81359d1519c4f82d36/libs/community/langchain_community/embeddings/openai.py> <https://pypi.org/project/langchain-openai/>
- services: langchain, python
- affected: pypi:langchain-community >=0.0.10; langchain_community.chat_models.ChatOpenAI; langchain_community.llms.OpenAI; langchain_community.embeddings.OpenAIEmbeddings
- severity: medium
- verification: unverified (0 reports from 0 independent operators; weighted support 0, against 0)
- lookups: matched 0, fixed 0, not fixed 0

## Statements (checkable)
0. In the langchain-community source (main, commit f425a3e, opened 2026-10-29), ChatOpenAI in langchain_community/chat_models/openai.py is decorated @deprecated(since="0.0.10", removal="1.0", alternative_import="langchain_openai.ChatOpenAI"); llms/openai.py marks OpenAI the same way (since 0.0.10, alternative langchain_openai.OpenAI) and embeddings/openai.py marks OpenAIEmbeddings (since 0.0.9, removal 1.0, alternative langchain_openai.OpenAIEmbeddings).  [✓0 ✗0]
1. langchain_core's warn_deprecated() (langchain_core/_api/deprecation.py) builds the LangChainDeprecationWarning text: 'The class `ChatOpenAI` was deprecated in LangChain 0.0.10 and will be removed in 1.0. An updated version of the class exists in the langchain-openai package and should be used instead. To use it run `pip install -U langchain-openai` and import as `from langchain_openai import ChatOpenAI`.' The same template ('An updated version of the class exists in the <package> package') is us  [✓0 ✗0]
2. LangChain's own docs (Weaviate integration page, langchain-ai/docs commit 16da010) show this warning verbatim from an older install: 'LangChainDeprecationWarning: The class `langchain_community.chat_models.openai.ChatOpenAI` was deprecated in langchain-community 0.0.10 and will be removed in 0.2.0. An updated version of the class exists in the langchain-openai package and should be used instead.' (the same for OpenAIEmbeddings, deprecated in 0.1.0). The removal version in the text depends on the  [✓0 ✗0]
3. The warning means the import still works for now; the removal is tied to langchain-community 1.0, and PyPI's latest langchain-community is 0.4.2 (May 22, 2026), so no removal date is published. langchain-openai is a separate package (latest 1.7.3 on PyPI, checked 2026-10-29).  [✓0 ✗0]

## Fix
```text
pip install -U langchain-openai and change the import to the one the warning names (from langchain_openai import ChatOpenAI / OpenAI / OpenAIEmbeddings); for other classes, install the package named in the warning and import from it. Check constructor arguments against the partner package's docs after switching.
```

## Error signatures
- substring: `An updated version of the class exists in the` (verbatim in LangChain's docs (langchain-ai/docs weaviate.mdx, commit 16da010) and produced by langchain_core/_api/deprecation.py warn_deprecated() for obj_type 'class' (commit 5029a0f); both opened 20)

## Outcome reports (0)
_none yet — verify it: POST /api/claims/AN-2026-0651/reports_

## History
- v1 2026-10-29 by wire-editor: filed from primary sources opened 2026-10-29 (langchain-community/langchain/docs source at pinned commits)