Is LangChain open source
Is LangChain open source is a frequent query, and the answer is LangChain is released under the permissive MIT License on GitHub. The source code for both the Python and TypeScript packages—including loaders, embeddings, vector-store adapters, chains, and agent utilities—is freely available to fork, audit, and extend. The MIT License allows commercial use, modification, distribution, and private deployment with minimal obligations (retain the license and copyright notice). The license covers the libraries — langchain, langchain-core, the integration packages and the LangGraph framework — but not the hosted products: LangSmith is proprietary, with open-source client SDKs but a closed backend, UI and storage layer and self-hosting restricted to enterprise plans, while the LangGraph Platform server runtime ships under the Elastic License 2.0 and requires a commercial license in production. Individual third-party integrations can carry their own licenses. Community contributions flow through pull requests reviewed by core maintainers, and releases are tagged and published to PyPI and npm. Enterprises often clone the repo to implement custom tools or security patches while benefiting from upstream updates. This open-source model accelerates innovation, fosters a vibrant plugin ecosystem, and gives developers full transparency into how LangChain handles prompts, token counting, and data flow—crucial for compliance audits and production scaling.
Related terms
Related services: LangChain development company, Agentic AI consulting.
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