Anthropic Acquires Stainless, Enhancing Developer Experience

Anthropic acquired Stainless, a startup founded in 2022, for $300 million to improve developer experience and enhance AI connections. Anthropic reportedly seeks new funding at an $800 billion valuation with $30 billion annualized revenue, surpassing OpenAI's rate.

Anthropic has acquired Stainless, a developer tools startup founded in 2022, for approximately $300 million . The acquisition aims to enhance the developer experience and improve connections between AI agents and external systems.

Stainless will reportedly wind down its products, including its SDK generator. The move comes as Anthropic pursues new funding at an $800 billion valuation and demonstrates the company's scale with $30 billion in annualized revenue, surpassing OpenAI's $24 billion run rate .

The Stainless acquisition deepens Anthropic's developer-tools stack and signals continued investment in the Claude API ecosystem as competition with MSFT-backed OpenAI, GOOGL Gemini, and META Llama intensifies. Better SDK ergonomics typically translate into faster enterprise adoption and higher per-customer API spend, which matters for Anthropic's revenue trajectory ahead of any future capital raise or public listing.