Harrison Chase

Today we’re excited to announce new funding for LangChain (at a $1.25B valuation) to allow us to build the platform for agent engineering. LangChain started as a single Python package 3 years ago. Since then, we’ve evolved into a comprehensive platform for agent engineering (LangGraph, LangSmith). Our tools now power AI teams like @Replit , @clay , @harvey , @TrustVanta , @Cloudflare , @Rippling , @Cisco , @Workday , and many more. Over the past three years we’ve iterated from LangChain to LangSmith to LangGraph. Our goal has always been to figure out what the agents of the future look like, and then build tools to help make them real. While our journey is still just beginning, I also want to take this moment to reflect on the past three years and how the space (and our offerings) have evolved. I wrote some personal reflections here: http:// blog.langchain.com/three-years-la ngchain/?utm_medium=social&utm_source=linkedin&utm_campaign=q4-2025_october-launch-week_aw … We also share more about the funding that will power our future here: http:// blog.langchain.com/series-b/?utm_ medium=social&utm_source=linkedin&utm_campaign=q4-2025_october-launch-week_aw … . Thank you to @IVP , @benchmark , @sequoia , @CapitalG , @SapphireVC , @AmplifyPartners and others for their belief in us. And what I’m most excited about today is that we’re launching a number of new features and products: an insights agent in LangSmith, 1.0 releases of LangChain and LangGraph, and a no-code agent builder. We’ll talk a lot more about these throughout the week. We are in the middle of a transformational technological shift, and are always looking for partners along the way. Whether you have feedback for us, want to work with us, or want to join us - please reach out!