LangChain Raises $300 Million at a $3 Billion Valuation, 2.4 Times Its Level of a Year Ago

LangChain, the San Francisco company behind the open-source agent framework of the same name, raised a $300 million Series C at a $3 billion valuation, TechCrunch reported on Friday, November 13. CapitalG led the round.

The valuation is 2.4 times the $1.25 billion LangChain was assigned about a year ago. The company has not published revenue, and neither of the two reports that carry the round gives a figure.

TechCrunch lists Singapore's GIC, DFJ Growth, IVP and Sapphire Ventures as the other investors. Crunchbase News placed the round in a tie for fourth on its list of the largest U.S. rounds for November 7 to 13, level with Path Robotics' $300 million Series E at $2.45 billion. The Terminal could not load LangChain's own announcement, so every figure here is as those two outlets report it.

Two rounds, thirteen months apart

The previous round was a $125 million Series B at $1.25 billion in October 2025, led by IVP, according to TechCrunch.

Round	Date	Amount	Valuation	Lead
Series B	October 2025	$125 million	$1.25 billion	IVP
Series C	November 13, 2026	$300 million	$3 billion	CapitalG

Neither report says whether the valuation is pre-money or post-money. If it is post-money, both rounds sold 10% of the company, since $125 million is a tenth of $1.25 billion and $300 million is a tenth of $3 billion. That is arithmetic on the reported figures, not a disclosed term.

What the 7,000 customers are

TechCrunch reports that LangChain claims 7,000 customers for LangSmith, the paid product for building and managing agents. It names Harvey, Rippling and Clay among startups using it, and Nvidia, Toyota and Salesforce among enterprises. The figure is the company's own, and it does not say how many pay, or how much.

Divide the $3 billion by 7,000 and the result is about $429,000 of valuation per claimed customer. That number is only useful as a comparison against a revenue-per-customer figure the company has not given.

LangChain began in 2022 as an open-source project covering tasks early language models handled badly, such as web search, API calls and database lookups. TechCrunch says the company now sells LangSmith as the layer that is not tied to one model, cloud or ecosystem. Crunchbase News describes it as a platform to run, improve and govern agents.

Where it sits among the week's rounds

A tie at $300 million with a robotics welding company shows how crowded the top of the November 7 to 13 list was: Mirendil, Mercor and Torus all sat above it. For comparison, the site has covered Fractile's Series C, where the share classes were the story, and Uforce's $700 million Series A, priced at $6 billion.

A $3 billion price on a company whose core framework is open source rests on the paid layer. The question a filing or a revenue disclosure would answer is how much of that 7,000-customer base converts to contracts rather than free-tier seats. LangChain has not said when it will share that number.