The tasks resemble those that lawyers, doctors, financial analysts, and management consultants solve for a living. One asks for a diagnosis of a six-year-old patient based on nine pieces of multimedia evidence; another asks for legal advice on a musician's estate; a third calls for a valuation of part of a healthcare technology company.

Mercor, which claims to supply “expert data” to every top AI company, says that it spent more than $500,000 to develop 200 tasks that test whether AIs "can perform knowledge work with high economic value" across law, medicine, finance, and management consulting. The resulting AI Productivity Index (APEX), published Wednesday, lists among its co-authors a former global managing director of McKinsey, a former dean of Harvard Business School, and a Harvard

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