LangChain Raises $300 Million at $3 Billion Valuation in Round Led by CapitalG

IVP, Sapphire Ventures, Singapore sovereign wealth fund GIC and DFJ Growth also took part. The valuation is 2.4 times the $1.25 billion LangChain reached in October 2025, when it raised $125 million in a round led by IVP in which CapitalG and Sapphire first invested.

The round puts a higher price on the software layer that sits between large language models and the business tasks companies want agents to carry out. LangChain does not build models. It sells the plumbing that connects them to tools and data and keeps them running once deployed, and investors are betting that demand for that plumbing grows as more companies move agents into production.

The company is best known for its eponymous open-source framework, released in 2022, which lets developers connect an agent to a language model, wire it to external tools and set its instructions with relatively little code. A second open-source project, LangGraph, links multiple agents into a single workflow and can insert steps that require a human to approve sensitive actions. A third, Deep Agents, adds features for longer and more complex jobs, including a virtual file system where agents can store data, a planning tool and the ability to spawn sub-agents.

The open-source tools are free. LangChain makes its money from LangSmith, a paid suite for building, testing and running agents. Teams use it to store successive versions of an agent, roll back to an earlier version when an update introduces a bug, and compare the quality of output between versions before choosing which to deploy. Its observability features record a trace of every step an agent takes to handle a request, analyse those traces for faults, rank them by severity and propose code fixes. Autodesk and Cisco are among its customers.

After its previous round, LangChain said its open-source tools were being downloaded about 90 million times a month.

The company plans to nearly double its headcount to 850 employees by the end of 2027, hiring infrastructure specialists, AI engineers, salespeople and marketers. The new money will also go toward expanding LangSmith, according to reports on the round.

Private-market data providers had listed a LangChain round of this size before Thursday's reports, and the exact closing date of the financing has not been disclosed.