Worth Hiring an AI Tutor? StudentBench Finds GRE Learning Gains Match Human Tutoring
In September 2026 Handshake AI Research released StudentBench: across ~2,383 participants on GRE Quant/Verbal, pooled AI tutoring was statistically equivalent to expert human tutoring (p=.015); Gemma 4 31B matched humans individually (p=.044) at ~918× lower cost per percentage point under the paper’s definitions.