LangChain
Framework and observability for building AI agents
AI
📍 San Francisco, CA
Founded 2022
Current Valuation
$1.3B
as of 2025
UNICORN
LangChain makes the most widely used open-source frameworks for building LLM applications and agents (LangChain, LangGraph) plus LangSmith, its observability and evaluation platform.
Fundraising Status
private
Founders & Key People
Harrison Chase
Products
- LangChain framework
- LangGraph
- LangSmith observability
Competitors
LlamaIndex · Vercel
AIDeveloper ToolsAgentsLLMOps
Private-company numbers are not real-time. Reflects publicly disclosed valuations from press releases, news reports, and tender offers as of 2025. Refreshed quarterly.