LangChain has raised $125 million, boosting its valuation to $1.25 billion, the company announced on Monday. This confirms a report that the open-source agentic AI framework provider was closing a round at a valuation of over $1 billion.
The fundraiser was led by IVP, with participation from new backers CapitalG and Sapphire Ventures, alongside existing investors Sequoia, Benchmark, and Amplify.
Founded in 2022 by machine learning engineer Harrison Chase, LangChain started as an open-source toolkit helping developers build applications on early large language models—simplifying complex operations like API calls, database interactions, and web searches. Its rapid popularity helped it secure a $10 million seed round from Benchmark in April 2023, followed by a $25 million Series A led by Sequoia just a week later, valuing the company at roughly $200 million at that time.
As modern model providers have expanded their infrastructure, LangChain has matured into a full-stack platform for building AI agents. Alongside its unicorn milestone, the company also announced major upgrades across its product suite—including the agent builder LangChain, orchestration and memory framework LangGraph, and its testing/observability platform LangSmith. The project continues to dominate the open-source community, boasting 118,000+ GitHub stars and 19.4k forks.
