Anthropic Acquires Stainless, What It Actually Means for Developers & the AI Agent Economy The News, Straight Up: What Happened On Monday, May 18, 2026, Anthropic dropped a piece of news that, at first glance, might have sounded like just another startup acquisition in a year already drowning in AI deal announcements. But lean in a little closer, and you'll notice something unusual: the company Anthropic just bought doesn't build AI models. It builds the plumbing . Anthropic officially announced it has acquired Stainless , a New York-based startup founded in 2022 by former Stripe engineer Alex Rattray . The terms were not disclosed, but The Information had previously reported that the two parties were in talks for a deal valued at more than $300 million — roughly double Stainless's $150 million valuation from its December 2024 funding round . Backed by Sequoia Capital and Andreessen Horowitz , Stainless had quietly becom...
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