Microsoft AI system diagnoses conditions more accurately than doctors

Summarised from 2 outlets · Updated 22 Oct, 19:58 · Archive

Microsoft claims its AI diagnostic tool achieves 83 per cent accuracy on complex medical cases, outperforming generalist physicians.

Microsoft has published research in Science claiming its AI diagnostic system outperforms human doctors at diagnosing complex medical conditions. The system, which Microsoft calls its Diagnostic Orchestrator or MAI-DxO, uses multiple AI agents working together like a panel of medical experts to review symptoms, order tests and reach diagnoses.

In tests on complex cases from the New England Journal of Medicine, Microsoft's system achieved 83 per cent diagnostic accuracy, compared with 36 per cent for generalist physicians using reference materials and 22 per cent for those without references. On emergency department cases from Beth Israel Deaconess Medical Center in Boston, the AI system scored 80 per cent accuracy versus an average of 47 per cent for human physicians. Microsoft also claims the AI reached diagnoses at lower estimated cost than human doctors.

Mustafa Suleyman, Microsoft's AI CEO, told The Verge the result represents a breakthrough, calling it a step toward 'medical superintelligence'. Dominic King, vice president of Health at Microsoft AI, said the work addresses 'the growing mismatch between demand and supply of medical expertise' in healthcare delivery.

TechCrunch notes that much of the improvement appears to come from the underlying AI models rather than Microsoft's orchestration system alone. Microsoft tested its system with models from OpenAI, Google, Anthropic, Meta and DeepSeek, achieving best results with OpenAI's GPT-5 and GPT-5.5. The comparison was limited to generalist physicians rather than specialists or physician teams, who typically handle such complex cases.

How it is being reported

• Microsoft’s Mustafa Suleyman says its AI outperforms doctors on hard cases as he chases ‘medical superintelligence’Microsoft’s new AI diagnostic system beat generalist doctors on hard cases, according to a study in Science. But most of the improvement seems to come from the AI models underneath, not from Microsoft’s system itself.TechCrunch · 22 Oct, 19:43
• Microsoft says its AI tool is better than doctors at diagnosing conditionsFor years, AI leaders have touted healthcare as one of the clearest examples of where their technology will improve lives. Now "it is finally here," Microsoft AI CEO Mustafa Suleyman tells The Verge. The company claims to have developed an AI-powered tool it says can diagnose conditions up to four times more accurately than human […]The Verge · 22 Oct, 19:00

In this story: Microsoft · Mustafa Suleyman · OpenAI · Beth Israel Deaconess Medical Center · Boston · Google · Meta · Anthropic

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