Stanford AI Index 2026: Human Scientists Still Outperform Best AI Agents by 2x on Complex Tasks

Nature·medium signal

Nature reports on the Stanford HAI AI Index 2026 finding that the best AI agents perform only half as well as PhD-level experts on complex scientific tasks. Despite rapid agent adoption — 6-9% of natural science publications now mention AI — there is limited evidence that AI is improving scientist productivity. Tempers expectations for fully autonomous AI research workflows.