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Qian-Wen Guo

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#artificial intelligence Preprint Oct 2026

EvoProbe: Evaluation-Driven Benchmark Evolution for LLM Agents

Static benchmarks for large language model (LLM) agents face saturation and data contamination risks, motivating continual updates to evaluation tasks. However, aggregate scores and success rates offer limited insight into specific problem-solving bottlenecks and provide limited guidance for subsequent task design. We...

Qian-Wen Guo, Wei Xie, Xiao-Fang Cai et al. · 0 citations
#artificial intelligence Preprint Oct 2026

Phantom Merge: When Your Large Language Model Agents Pick One but Tell You About Another

LLM agents increasingly operate over multiple entities, where reliable response generation requires not only retrieving relevant evidence but also preserving its association with the correct entity. We identify Phantom Merge (PM), an entity-evidence binding failure in which an agent attributes unsupported claims to its...

Wang-Shu Zhu, Qian-Wen Guo, Yu-Shun Dong · 0 citations

An Embarrassingly Simple Detector for Model Extraction Attacks in Large Language Model API Traffic

This work forms model extraction monitoring as benign-calibrated traffic-window distribution testing: embed incoming queries into a semantic space and test whether their aggregate distribution deviates from historical benign traffic.

Shu-Ze Liu, Qian-Wen Guo, Yushun Dong · 1 citation

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