LangChain raises $300M Series C at $3B valuation for LangSmith

LangChain announced on November 13, 2026 that it closed a $300 million Series C funding round, tripling its valuation to $3 billion from about $1.25 billion roughly a year earlier, according to LangChain's Series C announcement. The company said the new funding will go toward expanding LangSmith, its platform for building and operating AI agents.

What's in the round

• The $300 million Series C was led by CapitalG, with new investors GIC and DFJ Growth joining.
• Existing investors IVP and Sapphire Ventures participated, while Sequoia, Amplify and Benchmark were described as doubling down.
• The round values LangChain at $3 billion, up from about $1.25 billion roughly a year earlier.
• Proceeds are earmarked for LangSmith's three pillars: Agent Runtime, Agent Improvement, and Agent Governance.
• LangSmith now serves more than 7,000 organizations.

What it means for AI builders

LangSmith underpins a large share of the production agent tooling that developers rely on to build AI coding and automation agents. By directing this funding specifically toward agent runtime, improvement, and governance, LangChain is signaling where it expects agent infrastructure investment, and the problems developers need solved, to concentrate next.

What's next

LangChain teased new LangSmith capabilities for release on November 20, 2026, without detailing what those capabilities will include.

Sources

• LangChain Series C announcement (LangChain, November 13, 2026, official)

Written with AI assistance, strictly from the sources listed above. Before it went live, automated checks verified its dates, sources and every language edition.