Anthropic has acquired the dev tools startup used by OpenAI, Google, and Cloudflare
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- Anthropic announced it has acquired dev‑tools startup Stainless, which automates SDK generation from API specs.
- Stainless, founded by former Stripe engineer Alex Rattray, is backed by Sequoia Capital and Andreessen Horowitz and was reportedly valued at over $300 million in the deal.
- Stainless will wind down all hosted products, but existing customers retain full ownership and rights to modify the SDKs they generated.
- Stainless technology has powered every official Anthropic SDK since the API’s inception and was also used by rivals OpenAI, Google, Replicate, Runway, and Cloudflare.
- Anthropic says the tools will now be exclusive to its platform, removing a key infrastructure supplier from competitors.
Why it matters: Anthropic gains exclusive control of Stainless’s auto‑SDK platform, while rivals like OpenAI and Google lose a shared tool that automates API‑to‑code updates, tightening Anthropic’s edge in AI‑agent development after a $300 M acquisition.
