Human Baseline Performance Anchoring

via “human-baseline performance anchoring”

23 hardest BIG-Bench tasks where models initially failed.

Unique: Explicitly selected tasks where models underperformed humans at time of curation, creating a self-calibrated hard benchmark where human performance is the reference point rather than an afterthought. This selection strategy ensures the benchmark remains challenging as models improve.

vs others: More rigorous than benchmarks without human baselines because it enables quantitative model-vs-human comparison; more meaningful than benchmarks where humans outperform models by large margins, which may indicate task misalignment rather than genuine reasoning difficulty.