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Zi-Wei Xu

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#machine learning Review Sep 2026

Reward Hacking Challenges Oversight of Autonomous Research Agents

How often models reward-hack without instructions to do so, how effective and detectable their methods are when hacking is allowed, and how they adapt when an LLM review panel returns its decision and reasons are studied.

Yue Huang, Zhangchen Xu, Yu-Chen Ma et al. · 1 citation
Preprint Aug 2026

AI Security Leaderboard: Methodology, Results and Minimal Standard

This report tested four leading models for universal jailbreaks in the context of the FAR$AI Minimal Standard for Safeguards, and found more than a hundredfold difference in security.

Jasper Timm, Lukas Struppek, Zi-Wei Xu et al. · 1 citation

PEAR: Permutation-Equivariant Adaptive Routing Multi-Agent Debate

Comprehensive empirical evaluations demonstrate PEAR significantly improves average accuracy over the strongest debate baselines, and theoretically characterize PEAR as an equivariant sparse router: it preserves accuracy under agent relabeling while reducing routing complexity and improving generalization.

Yang Feng, Ziwei Xu, Xia Hu et al. · 0 citations

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