In early 2022, Stainless was founded with a mission to reinvent the API layer of the internet, and bring world-class developer experience to every company. At the time, developers wrote code with their fingers, maybe helped by autocomplete from LSPs if they were lucky.
In 2026, AI has transformed how we create and use software and APIs. What it means to deliver great developer experience has changed. What it means to make the internet more interconnected has changed. What it means to make software better for everyone has changed.
Great APIs are more essential now than ever. Nobody understands this better than Anthropic.
As one of our oldest and closest partners, we’ve had the opportunity to work hand-in-hand on nearly every Claude API launch and see up close just how much they share our passion for crafting thoughtful developer interfaces. We’ve also admired their industry leadership in connecting agents to complex APIs, and their incredible reach with developers and enterprises alike.
That’s why Stainless is joining Anthropic. There’s no better place for the Stainless team to build the future of internet software.
As we focus on Claude Platform capabilities and connecting agents to APIs, we’ll be winding down all hosted Stainless products, including our SDK generator. Starting today, new signups, projects, and SDKs will not be available.
If you’re a Stainless customer, visit app.stainless.com/transition for help transitioning from Stainless-managed products to other options. As always, you own the SDKs you’ve generated to date, and have full rights to modify and extend them however you wish.
We want to thank each and every one of our customers for the privilege of supporting the amazing things you build. We’re humbled to be part of your success – we estimate that roughly a quarter of the world’s professional software developers have used an SDK or visited a docs site you created with Stainless. That’s incredible. If APIs are the dendrites of the Internet, you all made the world a little smarter, and a little better, through your hard work and creativity.
Stainless was built for developers who care about craft, sweat the details, and take developer experience seriously. We’ll continue to represent those values as we join the Claude Platform team, and we hope you’ll be there to push and inspire us along the way.