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

Core OSS libraries:

Products:

  • LangSmith - platform for building and monitoring production-grade LLM applications
  • LangGraph Platform - infrastructure for deploying LangGraph agents

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 - Agent Protocol is our attempt at codifying the framework-agnostic APIs that are needed to serve LLM agents in production

Learn more

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Repositories

Showing 10 of 190 repositories
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    Build resilient language agents as graphs.

    langchain-ai/langgraph’s past year of commit activity
    Python 13,331 MIT 2,259 68 42 Updated May 31, 2025
  • langchain-ai/langchain-api-docs-html’s past year of commit activity
    HTML 5 MIT 5 1 0 Updated May 31, 2025
  • langchain-ai/chat-langchain’s past year of commit activity
    TypeScript 5,903 MIT 1,394 101 39 Updated May 31, 2025
  • helm Public

    Repository hosting Langchain helm charts.

    langchain-ai/helm’s past year of commit activity
    Shell 56 Apache-2.0 18 3 4 Updated May 31, 2025
  • langsmith-docs Public

    Documentation for langsmith

    langchain-ai/langsmith-docs’s past year of commit activity
    JavaScript 124 MIT 64 51 7 Updated May 31, 2025
  • langchain Public

    🦜🔗 Build context-aware reasoning applications

    langchain-ai/langchain’s past year of commit activity
    Jupyter Notebook 108,541 MIT 17,670 242 (6 issues need help) 56 Updated May 31, 2025
  • open-swe Public
    langchain-ai/open-swe’s past year of commit activity
    TypeScript 8 MIT 2 3 5 Updated May 31, 2025
  • langgraphjs Public

    Framework to build resilient language agents as graphs.

    langchain-ai/langgraphjs’s past year of commit activity
    TypeScript 1,547 MIT 226 91 16 Updated May 31, 2025
  • langgraphjs-api Public

    LangGraph.js CLI and in-memory server implementation

    langchain-ai/langgraphjs-api’s past year of commit activity
    TypeScript 31 MIT 16 6 0 Updated May 30, 2025
  • langsmith-sdk Public

    LangSmith Client SDK Implementations

    langchain-ai/langsmith-sdk’s past year of commit activity
    Python 557 MIT 121 101 51 Updated May 30, 2025