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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 194 repositories
  • langchain-ai/langchain-google’s past year of commit activity
    Python 209 MIT 252 98 (2 issues need help) 32 Updated Jun 11, 2025
  • langsmith-sdk Public

    LangSmith Client SDK Implementations

    langchain-ai/langsmith-sdk’s past year of commit activity
    Python 571 MIT 122 103 53 Updated Jun 11, 2025
  • langchainjs Public

    🦜🔗 Build context-aware reasoning applications 🦜🔗

    langchain-ai/langchainjs’s past year of commit activity
    TypeScript 14,777 MIT 2,532 114 (7 issues need help) 110 Updated Jun 11, 2025
  • open-swe Public
    langchain-ai/open-swe’s past year of commit activity
    TypeScript 21 MIT 5 5 6 Updated Jun 11, 2025
  • langchain Public

    🦜🔗 Build context-aware reasoning applications

    langchain-ai/langchain’s past year of commit activity
    Jupyter Notebook 109,201 MIT 17,765 240 (5 issues need help) 49 Updated Jun 11, 2025
  • langgraphjs Public

    Framework to build resilient language agents as graphs.

    langchain-ai/langgraphjs’s past year of commit activity
    TypeScript 1,617 MIT 238 99 17 Updated Jun 11, 2025
  • helm Public

    Repository hosting Langchain helm charts.

    langchain-ai/helm’s past year of commit activity
    Shell 58 Apache-2.0 19 4 2 Updated Jun 11, 2025
  • langgraph Public

    Build resilient language agents as graphs.

    langchain-ai/langgraph’s past year of commit activity
    Python 13,989 MIT 2,349 82 9 Updated Jun 11, 2025
  • langsmith-docs Public

    Documentation for langsmith

    langchain-ai/langsmith-docs’s past year of commit activity
    JavaScript 126 MIT 64 55 7 Updated Jun 10, 2025
  • langgraphjs-api Public

    LangGraph.js CLI and in-memory server implementation

    langchain-ai/langgraphjs-api’s past year of commit activity
    TypeScript 32 MIT 17 7 0 Updated Jun 10, 2025