LangChain has raised a $300 million Series C at a $3 billion valuation. Existing investor CapitalG led the round, with participation from GIC, DFJ Growth, IVP, Sapphire Ventures and several other new and returning investors.
The company plans to invest around LangSmith, its platform for deploying, monitoring, evaluating and governing AI agents. LangChain says more than 7,000 organizations use the product. Its examples include Clay monitoring hundreds of millions of agent runs each month and Workday reducing the time needed to deploy a new agent from five months to less than a day; those figures are company-provided customer claims.
LangSmith spans three areas. Runtime products include LangGraph, agent servers and isolated sandboxes. Improvement tools turn traces into evaluations, prompt or code fixes and fine-tuning data. Governance features manage access to models, tools and sensitive information, including budgets and fallback policies.
The financing reflects investor demand for infrastructure around agents rather than only the models underneath them. LangChain argues that companies want freedom to switch models while retaining control of their data and operational knowledge. It has promised additional LangSmith capabilities on November 20, so some of the next product details remain announcements rather than available features.