LangChain

LangChain is a platform for agent engineering, helping developers build, test and deploy reliable AI agents. Its business rests on open source frameworks and a commercial platform for observability, evaluation and deployment. The company operates worldwide and serves customers across the artificial intelligence, developer tools and enterprise software sectors, from large enterprises to startups.

Its open source work comprises two frameworks. LangChain provides a framework for building agents, with pre-built architectures and more than 1,000 integrations. LangGraph offers pre-built architectures intended to give developers both speed and granular control. The two together record over 90 million downloads a month and are used by millions of developers worldwide.

LangSmith is the commercial product. It provides observability, evaluation and deployment capabilities for turning LLM systems into dependable production experiences. Named customers include Replit, Clay, Cloudflare, Harvey, Rippling, Vanta, Workday, LinkedIn and Coinbase.

The company's work spans AI agent engineering, LLM application development, large language models, observability, evaluation and deployment tooling. Its stated orientation is open source driven, with an emphasis on reliability and production-ready AI agents.