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langchain

The agent engineering platform.

Visit langchain →View source

Best for

Builders who want composable primitives and the broadest ecosystem of integrations for LLM applications.

Avoid if

You want a ready-made autonomous agent out of the box — this is a framework, not an agent.

About langchain

LangChain is a framework for building agents and LLM-powered applications. It helps you chain together interoperable components and third-party integrations to simplify AI application development — all while future-proofing decisions as the underlying technology evolves.

If you're looking for more advanced customization or agent orchestration, check out LangGraph, our framework for building controllable agent workflows.

While the LangChain framework can be used standalone, it also integrates seamlessly with any LangChain product, giving developers a full suite of tools when building LLM applications.

From the project's README

langchain is an open-source project written primarily in Python, with 141k stars on GitHub. It was last updated in July 2026.

Install

uv add langchain
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