Marc Andreessen, the billionaire venture capitalist behind Andreessen Horowitz, told the New York Post that 'Doctor ChatGPT' already outperforms 99% of human doctors, a claim recirculated on X by Polymarket on Tuesday, 30 June 2026, and quickly seized on by physicians who say it ignores peer-reviewed evidence that could cause American patients real harm.
Andreessen offered no data to support the figure. He ignored a large body of peer-reviewed papers that have actually tested how physicians rate ChatGPT's medical advice. While some early 2024 studies praised AI accuracy, recent clinical trials reveal that LLMs frequently misdiagnose complex cases, explaining why physicians warn that unvetted AI usage poses a severe threat to patient safety.
