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Yujin Zhou

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#artificial intelligence Preprint Sep 2026

LexAgentHallu: A Hierarchical Benchmark for Profiling Hallucinations in Legal Agents

As large language models are increasingly deployed as tool-augmented legal agents, they introduce agentic hallucinations where tool-call and reasoning errors cascade into fabricated holdings and miscited authority. However, existing legal benchmarks evaluate only single-turn QA with outcome-level metrics, while agentic...

Yu-Jin Zhou, Min Zheng, Chuxue Cao et al. · 0 citations
Preprint Aug 2026

SkillProx: Self-Evolving Agent Skills via Proximal Textual Gradient Descent

SkillProx is introduced, a proximal-gradient-inspired forward--backward framework that couples closed-loop diagnostic evolution with utility-aware proximal refinement and demonstrates the complementary effects of closed-loop diagnosis and proximal refinement.

Mingxuan Zheng, Yu-Jin Zhou, Chuxue Cao et al. · 2 citations
Conference Open access 2026

Omni-RewardBench: Toward a Comprehensive Evaluation of Generative Reward Models Across Modalities

Omni-RewardBench is introduced, the first benchmark for comprehensive evaluation of ORMs across modalities and demonstrates that current OLLMs fall short as reward models, revealing several common failure modes such as perception failure, modality dominance failure, and cross-modal fusion failure.

Chi-Min Chan, Yujin Zhou, Pengcheng Wen et al. · 0 citations

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