LangChain logo. Courtesy LangChain.
LangChain announced Friday that it has raised $300 million at a $3 billion valuation, giving the San Francisco software company more capital to help businesses build, run and control their own artificial-intelligence agents.
The Series C round was led by CapitalG, with new investors GIC and DFJ Growth joining existing backers IVP and Sapphire Ventures. It brings LangChain’s total funding to $460 million, the company said in its November 13 announcement.
The money is going into the software around AI models, rather than a new model itself. An agent combines a model with access to information and tools so it can carry out a task, not simply answer a question. For a business, the challenge is making that system work reliably, testing its mistakes and deciding what information or actions it can access.
LangChain is building that business around LangSmith, its platform for deploying agents, monitoring what they do and improving their performance. The company says more than 7,000 organizations use LangSmith, naming customers including Nvidia, Toyota, Salesforce, Harvey and Rippling.
“Every company should be free to choose the best models for its needs, control its data and infrastructure, and continuously improve its agents, while maintaining the governance needed to operate securely at scale,” co-founder and Chief Executive Harrison Chase said in the announcement.
That choice is central to LangChain’s pitch. Its open-source tools, including LangChain and LangGraph, let developers build agents using different models. LangSmith provides the services for putting those systems into everyday use, watching their behavior and testing changes before they cause problems.
The company described three areas of work: infrastructure to run agents, testing and monitoring to improve them, and controls over their use of models, data and other tools. Its governance products are intended to help companies manage model spending, protect sensitive information and decide which systems an agent may use.
LangChain cited Workday as an example of the operational gains it is trying to sell. The company said Workday uses LangSmith to run and govern agents and has cut the time to deploy a new agent from five months to less than a day. It also said Clay uses the platform to monitor hundreds of millions of agent runs each month.
The new valuation is 2.4 times the $1.25 billion value LangChain announced in October 2025, when it raised $125 million in a round led by IVP. CapitalG and Sapphire joined as new investors in that earlier financing and are now returning backers.
LangChain plans to show additional LangSmith capabilities at a November 20 release event, building on the platform for running, improving and governing agents.
JBizNews Desk | San Francisco
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