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Build context-aware reasoning applications with LangChain’s flexible abstractions and AI-first toolkits.

Core OSS libraries:

Commercial Platform:

  • LangSmith - platform for building and monitoring production-grade LLM applications

OSS extensions and apps:

  • ChatLangChain and ChatLangChain.js - chatbot for answering questions about LangChain's open source libraries
  • Open Canvas - document & chat-based UX for writing code or markdown. Inspired by OpenAI's Canvas (TypeScript)
  • OpenGPTs - open source version of OpenAI's GPTs API (Python)
  • Email assistant - AI assistant that helps you maintain your emails (Python)
  • LangChain + Next.js template - template LangChain.js + Next.js application
  • Social media agent - agent for sourcing, curating, and scheduling social media posts with human-in-the-loop (TypeScript)
  • Agent Protocol - our attempt at codifying the framework-agnostic APIs that are needed to serve LLM agents in production

Learn more

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    langchain-ai/langchain’s past year of commit activity
    Python 118,276 MIT 19,478 168 (49 issues need help) 94 Updated Oct 28, 2025
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    langchain-ai/langchainjs’s past year of commit activity
    TypeScript 16,146 MIT 2,835 134 (6 issues need help) 70 Updated Oct 28, 2025
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    langchain-ai/langgraphjs’s past year of commit activity
    TypeScript 2,215 MIT 335 59 23 Updated Oct 28, 2025
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    langchain-ai/langchain-ibm’s past year of commit activity
    Python 22 MIT 20 8 1 Updated Oct 28, 2025
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    langchain-ai/langchain-google’s past year of commit activity
    Python 279 MIT 317 85 (10 issues need help) 13 Updated Oct 28, 2025
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    langchain-ai/langchain-mongodb’s past year of commit activity
    Python 76 MIT 34 4 6 Updated Oct 28, 2025
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    Python 33 MIT 12 13 0 Updated Oct 28, 2025
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