Author

Jun Chen

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#machine learning Preprint Sep 2026

How Sensitive Are LLM Leaderboard Claims to Hidden Model Selection?

LLM leaderboard gains can reflect selection among privately evaluated model variants, yet neither the number of variants nor their dependence is public. We ask how many hidden variants a published margin can support while retaining statistical evidence of a provider's advantage over a fixed comparator. For a fixed cand...

Chen Yang, Jun Chen · 0 citations

#machine learning Preprint Sep 2026

RLVR is a Kernel, Not a Function: Statistical Inference for pass@$k$ Crossovers

Reinforcement learning with verifiable rewards with verifiable rewards often improves pass@1 while falling behind its base model at larger sampling budgets, a crossover read as evidence that RLVR only sharpens existing capability is identified.

Chen Yang, Jun Chen · 0 citations