Anthropic acquires Stainless, the SDK and MCP tooling startup used by OpenAI and Google

Summary

Anthropic announced on May 18 that it has acquired Stainless, the New York–based developer tools startup behind the SDK generators used by OpenAI, Google, Cloudflare, and most major MCP server implementations. Terms were not disclosed; The Information reported the deal was in the $300M+ range. Stainless will wind down all hosted products including its SDK generator; existing customers retain rights to SDKs already generated, but new generation flows for competitors will need to be rebuilt or mig