LangChain raises $300 million led by CapitalG

LangChain released its eponymous open-source framework in 2022, and the software has since become a common starting point for developers building AI agents. The framework reduces the work involved in connecting an agent to a large language model, integrating it with tools and adding a system prompt, while LangGraph links multiple agents into a single workflow and Deep Agents adds a virtual file system and planning tools.

The company generates revenue through LangSmith, a paid suite that helps teams maintain agents in production by storing iterations in a central repository, restoring earlier versions when bugs appear, and comparing output quality across versions. After its previous funding round last year, LangChain disclosed that its open-source tools were being downloaded about 90 million times per month, and LangSmith is used by Autodesk, Cisco Systems and other tech firms.

The new funding, led by CapitalG with participation from IVP, Sapphire Ventures, GIC and DFJ Growth, values LangChain at $3 billion. The company reportedly plans to nearly double its headcount to 850 employees by the end of 2027, hiring infrastructure experts, AI engineers, salespeople and marketers.