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cs.CL2026
SkillEval: Learning Interpretable Ability Profiles of LLMs via Cognitive Diagnosis Models
Berke Arda, Peng Cui, Qiaoyuan Zheng +3
Current evaluation of LLMs on benchmarks typically aggregates performance over individual examples into a single scalar score. This approach is overly coarse and ignores the divers…
cs.CL2026
What Makes Something Hard(er)? Explaining Question Difficulty in Natural Language
Peng Cui, Qiaoyuan Zheng, Rudolf Debelak +1
Difficulty is one of the most fundamental properties of a question: it determines whether the question can meaningfully discriminate between models of differing ability. Although a…
cs.AI2026
Do LLMs Exhibit Coherent Knowledge Structures in Mathematical Reasoning? A Perspective from Knowledge Space Theory
Peng Cui, Heejin Do, Mrinmaya Sachan
Human knowledge is inherently structured and interdependent: mastery of a concept requires prior mastery of its prerequisites, a principle formalized by Knowledge Space Theory (KST…