Anthropic has acquired the dev tools startup used by OpenAI, Google, and Cloudflare

Nairavoice | May 18, 2026 345 0 1 min read
Anthropic has acquired the dev tools startup used by OpenAI, Google, and Cloudflare

The technology is particularly valuable to companies like Anthropic, OpenAI, Google, Replicate, Runway, and Cloudflare that are building AI agents that can connect to external software and complete tasks on behalf of users. Stainless’s SDK tools are an easy way to build and maintain those connections — but going forward, the tools will only be available to Anthropic, not its competitors.

According to Anthropic, Stainless software has powered the generation of every official Anthropic SDK since the earliest days of its API.

“I started Stainless because SDKs deserve as much care as the APIs they wrap,” Rattray said in a press release posted Monday. “Anthropic was one of the first teams to bet on this with us. We have been watching what developers have built on Claude over the last few years, which made bringing our teams together an easy decision. The team gets to keep doing the work we love, on the platform where it matters most.”

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