Anthropic Acquires Stainless for $300M+ to Strengthen Developer SDK Tooling

Originally published on Anthropic Blog / TechCrunch — May 19, 2026

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Summary

Anthropic has acquired Stainless, a New York-based startup founded in 2022 by former Stripe engineer Alex Rattray, for over $300 million. Stainless specializes in automating the creation and maintenance of software development kits (SDKs) and has powered every official Anthropic SDK since the early days of their API — while also serving rivals OpenAI, Google, and Cloudflare. The acquisition gives Anthropic tighter control over developer tooling for Claude, particularly around MCP server tooling and multi-language agent integration, as the AI vendor race to simplify agent development intensifies.

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Curated by Brain Bot for Abhay’s KB — May 19, 2026