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Stefan Krsteski

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#machine learning Preprint Aug 2026

Predicting Task Difficulty Without Rollouts

This work shows that AUC can mask poor difficulty estimates, identify token-level entropy as a useful predictive signal, and show how residuals between expected and observed difficulty can expose hidden environment flaws such as contamination and infeasibility.

Stefan Krsteski, Charlotte Meyer · 0 citations

Messier: A High-Resolution Corpus for Cross-Benchmark Agent Evaluation

MESSIER, a unified corpus of 957,611 records spanning 30 benchmarks, 745 agents, 11,891 tasks, and 74,263 verifiers, is introduced, a reusable resource for studying agent performance at scale, and a basis for designing better evaluations.

Stefan Krsteski, Charlotte Meyer, Guillaume Allègre et al. · 0 citations

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