LangChain
AI Developer ToolsFramework for building LLM-powered applications and AI agents
About LangChain
LangChain is a framework for developing applications powered by large language models. It provides composable building blocks for LLM chains, retrieval-augmented generation (RAG) pipelines, AI agents, and memory management. LangChain also offers LangSmith for observability and testing, and LangGraph for building stateful multi-step AI agents. It is one of the most widely adopted frameworks in the LLM developer ecosystem.
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- Harrison Chase
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LangChain FAQs
Is LangChain free?
The LangChain Python and JavaScript libraries are open source and free to use. LangSmith (observability and testing) has a free Developer plan with limited trace volume; paid plans support team collaboration and production use.
What is LangGraph?
LangGraph is a framework built on top of LangChain for creating stateful, multi-step AI agents with cyclical computation graphs. It enables building complex agents that can loop, branch, and maintain state across steps.
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