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

Core OSS libraries:

• LangChain and LangChain.js - reusable components and integrations for building LLM applications
• LangGraph and LangGraph.js - build LLM agents as graphs

Products:

• LangSmith - platform for building and monitoring production-grade LLM applications (SDK)
• 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 - our attempt at codifying the framework-agnostic APIs that are needed to serve LLM agents in production

Learn more

• Community forum
• Company website
• LangChain Academy - comprehensive, free courses on LangChain libraries and products, made by the LangChain team
• LangChain docs - Python and TypeScript
• LangGraph docs - Python and TypeScript
• LangSmith docs
• LangGraph Platform docs