Microsoft’s Medical AI Redefines Diagnostics: 85.5% Accuracy, 20% Cheaper Than Doctors

Despite the strong performance of Microsoft’s medical AI MAI-DxO in testing, which included models from OpenAI, Google, Anthropic, Meta, and xAI, clinical barriers remain.

Microsoft’s new medical AI, the MAI-DxO system, has outperformed physicians on some of the toughest diagnostic challenges, achieving 85.5% accuracy, over four times higher than that of human doctors.

In a study from the company’s AI unit, Microsoft claims that “AI doesn’t face the trade-off,” noting the system combines depth with breadth to outperform individual physicians across multiple aspects of diagnostic reasoning. The MAI-DxO model also reduced diagnostic costs compared to doctors, expanding the definition of medical expertise beyond the human mind.

Microsoft’s AI correctly diagnosed what doctors missed

Led by Mustafa Suleyman, Microsoft’s AI unit set out to test whether its new system could handle diagnoses that challenge even experienced doctors. The team ran MAI-DxO through 304 real-world ...