LangChain, a startup known for open-source tools for developing AI agents, has raised $300 million in funding, SiliconANGLE reported on Tuesday.

The funding round was led by CapitalG, a fund under Alphabet, the report said. IVP, Sapphire Ventures, GIC and DFJ Growth also participated. LangChain was valued at $3 billion in the round. The Wall Street Journal reported the funding first.

San Francisco-based LangChain released the open-source LangChain framework in 2022. Developers can use it to connect AI agents to large language models, integrate them with tools and add system prompts more easily, the company said.

LangGraph, offered by LangChain, targets complex tasks that are difficult to automate with a single agent. It can bundle multiple LangChain-based agents into one automated workflow and add a mechanism for humans to approve sensitive tasks. Deep Agents provide a virtual file system for agents to store data, task-planning tools and a function to create sub-agents.

LangChain's revenue comes from its paid product suite, LangSmith. Developers can build agents with LangSmith and maintain them in the operational stage. LangChain said after its previous funding round last year that its open-source tools are downloaded about 90 million times a month. LangSmith is used by several technology companies, including Autodesk and Cisco.