Building applications with LLMs through composability

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  • License: MIT License (MIT)
  • Requires: Python <4.0.0, >=3.10.0
  • Provides-Extra: anthropic , aws , azure-ai , cohere , community , deepseek , fireworks , google-genai , google-vertexai , groq , huggingface , mistralai , ollama , openai , perplexity , together , xai
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🦜️🔗 LangChain Classic

PyPI - Version PyPI - License PyPI - Downloads Twitter

Looking for the JS/TS version? Check out LangChain.js.

To help you ship LangChain apps to production faster, check out LangSmith. LangSmith is a unified developer platform for building, testing, and monitoring LLM applications.

Quick Install

pip install langchain-classic

🤔 What is this?

Legacy chains, langchain-community re-exports, indexing API, deprecated functionality, and more.

In most cases, you should be using the main langchain package.

📖 Documentation

For full documentation, see the API reference. For conceptual guides, tutorials, and examples on using LangChain, see the LangChain Docs.

📕 Releases & Versioning

See our Releases and Versioning policies.

💁 Contributing

As an open-source project in a rapidly developing field, we are extremely open to contributions, whether it be in the form of a new feature, improved infrastructure, or better documentation.

For detailed information on how to contribute, see the Contributing Guide.

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  • License: MIT License (MIT)
  • Requires: Python <4.0.0, >=3.10.0
  • Provides-Extra: anthropic , aws , azure-ai , cohere , community , deepseek , fireworks , google-genai , google-vertexai , groq , huggingface , mistralai , ollama , openai , perplexity , together , xai
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