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Anthropic Buys Stainless To Cut Off OpenAI And Google SDK Access

Anthropic will end Stainless’s hosted products, while customers keep rights to SDKs already generated and rivals lose access to the tools.

Summary by Forbes
Anthropic acquired Stainless, the SDK toolmaker behind OpenAI and Google, then shut the hosted products down for rivals. Inside the agentic AI infrastructure play.

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

Stainless, a New York-based startup, will wind down all hosted products as part of the acquisition.

·United States
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Anthropic, the AI company that develops Claude, has announced that it has acquired Stainless, the developer of the official SDK (Software Development Kit) and MCP server tools. The terms of the acquisition, such as the price, have not been disclosed.

Anthropic announced the purchase of Stainless, a startup specialized in automating the creation and maintenance of SDK for APIs, whose technology was used by companies such as OpenAI, Google and Cloudflare. The operation not only strengthens the technical infrastructure of Anthropic, but also removes from the market a key tool for several of its competitors. *** Anthropic acquired Stainless, a startup founded in 2022 by the former engineer of St…

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Forbes broke the news in United States on Monday, May 18, 2026.
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