arXiv AI By Luca Zhou, Sajel Shah, Emanuele Rodol\`a, Roberto Dess\`i

Hard or Just Unreached? Diagnosing the Sampling Blind Spot in Math-Reasoning Difficulty Estimation

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arXiv:2606. 19636v1 Announce Type: cross Abstract: Math and science reasoning benchmarks rely on pass@k, the fraction of sampled chains that reach gold, as the canonical per-example difficulty signal.

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