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Anthropic has acquired the dev tools startup used by OpenAI, Google, and Cloudflare

TechCrunch AI · May 18, 2026, 7:27 PM · Also reported by 1 other source

Key takeaways

  • Anthropic announced Monday it has acquired Stainless, a startup founded by former Stripe engineer Alex Rattray whose software is widely used by rival AI labs, including Open AI and Google.
  • However, The Information reported last week that Anthropic was in talks to acquire Stainless, which is backed by Sequoia Capital and Andreessen Horowitz, for more than $300 million.
  • The acquisition will take a key infrastructure supplier out of the hands of Anthropic s competitors.

Why this matters: a development in AI with implications for how people work, create, and decide.

Anthropic announced Monday it has acquired Stainless, a startup founded by former Stripe engineer Alex Rattray whose software is widely used by rival AI labs, including Open AI and Google.

Anthropic didn t disclose terms of the deal. However, The Information reported last week that Anthropic was in talks to acquire Stainless, which is backed by Sequoia Capital and Andreessen Horowitz, for more than $300 million.

The acquisition will take a key infrastructure supplier out of the hands of Anthropic s competitors. The company told TechCrunch it will wind down all hosted Stainless products, including its SDK generator. An Anthropic spokesperson said Stainless customers will still own the SDKs they’ve generated to date, and have full rights to modify and extend them however they wish.

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