LangChain Raises $300M at $3B Valuation

LangChain, the San Francisco startup behind one of the most widely used open-source toolkits for building AI agents, said on Friday, Nov. 13, that it has raised $300 million in a Series C round at a $3 billion valuation. The money will go into LangSmith, its paid platform for running, improving and governing agents. TechCrunch first reported the round.

Key takeaways

• CapitalG, Alphabet's growth fund and an existing investor, led the $300 million round, with new investors GIC and DFJ Growth and existing backers IVP and Sapphire Ventures.
• The $3 billion valuation is 2.4 times the $1.25 billion LangChain was valued at when it raised $125 million in October 2025.
• LangChain says more than 7,000 organizations use LangSmith and plans to show new features at a release event on Nov. 20.

LangChain Series C: who invested

In a blog post signed by co-founder and CEO Harrison Chase, the company said the round was "led by existing investor CapitalG, with significant participation from new investors GIC and DFJ Growth and existing investors IVP and Sapphire Ventures."

A note at the end of the post also welcomes Salesforce Ventures, Insight Venture Partners, QuantumLight and MongoDB Ventures, and thanks Sequoia, Amplify and Benchmark for "doubling down in this round."

The jump is steep. On Oct. 20, 2025, LangChain announced a $125 million round at a $1.25 billion valuation, led by IVP, with CapitalG and Sapphire Ventures joining as new investors at the time.

What LangSmith does for AI agents

LangChain began as an open-source framework, and its libraries, including LangGraph and Deep Agents, remain free. LangSmith is where the company makes money. Chase calls it "the framework-agnostic platform to run, improve, and govern agents," meaning teams do not have to build with LangChain's own code to use it.

The company groups LangSmith into three pillars:

• Agent Runtime: Agent Server and Sandboxes to deploy agents in the cloud or a customer's own environment, plus managed services called Managed Agents and Fleet.
• Agent Improvement: Observability and Evaluation tools, LangSmith Engine, an in-platform agent that finds errors and writes code and prompt fixes, and Fine-Tuning, which turns agent traces into training data.
• Agent Governance: LLM and Tool Gateways that manage model budgets and fallbacks, protect sensitive data and control tool access across teams.

Customers and usage claims

LangChain says more than 7,000 organizations rely on LangSmith, naming startups Harvey, Rippling and Listen Labs and large companies NVIDIA, Toyota and Salesforce. It says Clay uses the platform to monitor "hundreds of millions of agent runs per month," and that Workday cut the time to deploy a new agent "from five months to under a day." These figures come from the company and have not been independently verified.

Context: the money moves to agent operations

The pitch is that agents, not just models, will set companies apart. "We believe agents will transform the economy," Chase wrote, arguing that "every company will need to own its intelligence" by choosing its own models and controlling its data.

That puts LangChain in the business of tooling around agents once they are live: monitoring, testing and limiting what they can touch. The need is real. Researchers have documented agents that turned to SQL injection when ordinary requests failed, the kind of behavior governance layers are meant to catch.

What's next

LangChain says it will share "several new LangSmith capabilities" at a virtual release event on Friday, Nov. 20. The company is also listed for AWS re:Invent in Las Vegas on Nov. 30. The post did not disclose revenue or say how the new money will be split between hiring and product work.

FAQ

Is LangChain still open source? Yes. The LangChain, LangGraph and Deep Agents frameworks remain open source. LangSmith is the company's commercial platform.

Do I need LangChain's framework to use LangSmith? No. LangChain describes LangSmith as framework-agnostic, so agents built with other tools can run on it.

How much has LangChain's valuation grown? From $1.25 billion in October 2025 to $3 billion in November 2026, a 2.4-fold increase.

References

• LangChain Raises $300M to Enable Every Company to Own Its Intelligence — LangChain (Nov. 13, 2026)
• LangChain raises $125M to build the platform for agent engineering — LangChain (Oct. 20, 2025)