LangChain.

In their words

• Reflections on Three Years of Building LangChain Harrison Chase looks back on three years of LangChain, from an 800-line side project in fall 2022 to a company announcing a $125 million round at a $1.25 billion valuation. He walks through LangSmith, LangGraph and the langchain 1.0 rewrite, including how the team responded to criticism of the original package.