companies

LangChain Inc.

Developer platform company behind the open-source LangChain and LangGraph frameworks for building AI agents and LLM applications.

LangChain began in October 2022 as an open-source Python package created by Harrison Chase. In early 2023, Chase and co-founder Ankush Gola incorporated LangChain Inc. and raised a seed round, building a company around the popular open-source framework for developing LLM-powered applications. The company's core products are LangChain, a framework for composing LLM application components, and LangGraph, a framework for building stateful, controllable AI agents, alongside the LangSmith observability platform. LangChain Inc. is headquartered in San Francisco, California. The company has raised over $260 million across multiple rounds, including a $10 million seed round led by Benchmark (April 2023), a $25 million Series A led by Sequoia Capital (February 2024), and a $125 million Series B led by IVP with participation from CapitalG and others (October 2025), valuing the company at roughly $1.25 billion.

Founded

2023

Headquarters

San Francisco

Sector

infrastructure