GoKawiilOpenEvidence's AI medical search tool hits $15 billion valuation
OpenEvidence, a Miami-based AI search startup founded by Daniel Nadler in 2022, says nearly two-thirds of US physicians now use its chatbot to consult medical journals and clinical guidelines, with over 42 million prompts processed last month. The company raised $250 million in September at a $15 billion valuation, backed by investors including Andreessen Horowitz, Blackstone, Thrive Capital and Sequoia, and reported $100 million in ad commitments for 2025.
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The rapid adoption by physicians suggests AI tools are moving from experimental to embedded in clinical decision-making faster than prior health software, which founder Daniel Nadler frames as the first viral consumer app in healthcare. Researchers' scrutiny of result accuracy points to real stakes if doctors lean on the tool for treatment decisions, while competition from OpenAI and Anthropic could test whether OpenEvidence's early lead and ad-based model hold up.
- OpenEvidence reached a $15 billion valuation after a $250 million funding round in September.
- About two-thirds of US doctors reportedly use the AI search tool, with 42 million prompts in one month.
- The startup faces emerging competition from OpenAI and Anthropic and scrutiny over result accuracy.
Source: arstechnica.com, 2026-10-21
Published there as: “The $15 billion ad-powered AI startup your doctor may already be using”
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