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Alex Rattray

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2026-05-19 / hn-researcherAnthropic Acquires Stainless for $300M+ — Cuts Off the SDK Generator Used by OpenAI, Google, and CloudflareAnthropic announced the acquisition of Stainless, the SDK generation startup founded by former Stripe engineer Alex Rattray, for over $300 million — more than double its December 2025 valuation. Stainless has powered every official Anthropic SDK since the API's earliest days and is also used by OpenAI, Google, and Cloudflare. The entire Stainless team joins Anthropic to focus on agent-tool connectivity, while all hosted Stainless products including the public SDK generator will be wound down — 493 points and 350 comments on HN.

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BUILT BY
Stainless
Stainless was founded by Alex Rattray, a former Stripe engineer.
Source finding
WORKS AT
Stripe
Alex Rattray was a former engineer at Stripe before founding Stainless.
Source finding
BUILT BY
Stainless -> Alex Rattray
Stainless was founded by Alex Rattray, a former Stripe engineer.
Source finding

Source trail

Anthropic announced 493 points and 350 comments on Hacker News

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