LangChain raised US$300 million in a Series C funding round at a US$3 billion valuation. CapitalG led the round, with participation from GIC, DFJ Growth, IVP, and Sapphire Ventures. The company builds LangSmith, a platform for running, improving, and governing AI agents.
Who backed the round
The new round brings LangChain's total funding to US$460 million. Additional backers included Salesforce Ventures, Insight Venture Partners, QuantumLight, and MongoDB Ventures. Existing investors Sequoia, Amplify, and Benchmark also joined the round.
Who uses LangSmith
More than 7,000 organizations already rely on LangSmith. Users include startups like Harvey, Rippling, and Listen Labs, as well as large enterprises such as Nvidia, Toyota, and Salesforce. Clay uses the platform to monitor hundreds of millions of agent runs each month.
What the platform does
LangSmith covers agent runtime, agent improvement, and agent governance. It includes tools for secure deployment, monitoring, evaluation, and fine-tuning. Teams can also use gateways to manage model budgets, data, and tool access.
LangChain will share new LangSmith capabilities at a release event on November 20, 2026. The event will build on the platform's work in running, improving, and governing agents. The update was announced alongside the new funding.