StainlessAcquired

Stainless is a developer tools startup founded in 2022 by Alex Rattray, a former Stripe engineer[1]. Based in New York, the company automates the creation and maintenance of software development kits (SDKs)[1]. Its platform was used by OpenAI, Google, and Cloudflare[1]. Stainless was backed by investors including Sequoia Capital and Andreessen Horowitz[1]. On May 18, 2026, Anthropic announced its acquisition of Stainless in a deal reported at more than $300 million[1]. Following the acquisition, Anthropic stated it would wind down Stainless's hosted products[1].

Deals & lineage

Acquired by

• Anthropic

  Develops AI systems and related products focused on safety, reliability, and interpretability.

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