Anthropic has officially announced the acquisition of the developer tools startup Stainless, with the deal reportedly exceeding $30 million, according to The Information. Stainless was founded by Alex Rattray, a former prominent engineer at Stripe, and its core technology focuses on automatically generating and maintaining high-quality SDKs (software development kits) for multiple programming languages (such as Python and TypeScript) through API specifications. This move marks a strategic step for Anthropic in enhancing the Claude model developer ecosystem and strengthening the underlying infrastructure of AI agents.
As a previously recognized "infrastructure layer" service provider in the AI industry, Stainless had once counted OpenAI, Google, Cloudflare, and Runway among its clients—direct competitors of Anthropic. With the completion of the acquisition agreement, Anthropic plans to gradually shut down all external hosting services of Stainless. This means that giants like OpenAI and Google will lose this critical automated tool support, forcing them to return to more costly and time-consuming manual SDK maintenance models.
Industry analysts point out that as competition in large model applications enters an explosive phase, the speed and stability of SDK delivery directly determine the barrier for developers to access models. Through this acquisition, Anthropic not only successfully internalized Stainless' advanced automation engineering capabilities but also built a solid ecological barrier by vertically integrating its technology stack. In the context of increasingly complex API call demands for AI agents, mastering this core toolchain will give Anthropic a more proactive competitive position in the infrastructure race against OpenAI.
