30-month study of 26,811 students: AI homework use raised scores 18% but exam scores fell 20%
lmoroney · x · 2026-10-24
A new CEPR study by David Strömberg, Victor Lei and Yanhui Wu followed 26,811 students in grades 7-12 in central China for 30 months. Within six months of AI use, homework time dropped from 64 to 45 minutes and homework scores rose 18%. But closed-book monthly exam scores fell 20%, and entrance exam scores dropped up to 24% after about two years. Students who used AI while keeping study time constant scored about the same as those who never used it. The authors suggest short in-class quizzes to verify real learning — time on task still matters.
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