Artificial intelligence that can "reason" is now capable of diagnosing real-life medical scenarios as well as or better than physicians, according to the results of a study published Thursday in Science. The researchers used previously unknown clinical cases to test OpenAI 's reasoning model o1 against the company's older model, GPT-4, as well as physicians and medical residents in training. In a range of experiments, the o1 model often improved significantly on GPT-4's diagnostic ability and bested physicians, too. When tested with the electronic health records of random emergency department cases from a Boston hospital, the o1 model was diagnostically accurate more than two-thirds of the time at initial triage. Two expert attending physicians had correct diagnoses roughly half of the time. Dr.…