Anthropic acquired Stainless, a New York startup that converts API specifications into SDKs, command-line tools, and MCP servers. Stainless automatically generates and maintains SDKs across languages including Python, TypeScript, Go, Java, and Kotlin, and updates them as underlying APIs change. The acquisition increases Anthropic’s control over developer infrastructure as AI companies compete on ease of building, not only model quality. Stainless was founded in 2022 and became widely used in the AI ecosystem, including powering official Anthropic SDK generation since early API days. Anthropic will wind down hosted Stainless products, including the automated SDK generator, while existing Stainless customers will still own the SDKs they received.
"The company announced Monday that it has acquired Stainless, a New York-based startup that turns API specifications into SDKs, command-line tools, and MCP servers. The deal gives Anthropic deeper control over developer infrastructure at a time when AI companies are competing not only on model quality, but on how easily developers can build with their tools."
"Stainless sits in a layer most users never see, but developers depend on heavily. It takes API specifications and turns them into ready-to-use SDKs, then keeps them updated as APIs change. That removes the manual work of maintaining integrations across multiple programming languages."
"According to Anthropic, Stainless has powered the generation of every official Anthropic SDK since the early days of its API. That same tooling has also been used across the industry by companies like OpenAI, Google, Cloudflare, Runway, and Replicate, TechCrunch reported."
"The acquisition immediately shifts the competitive landscape by removing this toolchain from the broader market. Anthropic confirmed it will wind down all hosted Stainless products, including its automated SDK generator. An Anthropic spokesperson stated that existing Stainless customers will still own the SDK"
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