Author

Zhong-Han Bian

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Preprint Aug 2026

Groundbench: Multi-Resolution Polygon Grounding Exposes the Geometry Gap in Vision-Language Models

Bounding-box scores on RefCOCO-family grounding leave little room to distinguish frontier vision-language systems, yet boxes discard object shape. We introduce GroundingBench, a matched benchmark that re-targets the same 1,500 image-expression-referent triples to exact-N polygons at five vertex budgets. A fixed-denomin...

Zhong-Han Bian, Zhen-Ran Wang, Jin-Song Li et al. · 0 citations

Preprint Aug 2026

WorldCup Arena: Prospective, Leakage-Free Evaluation of Frontier LLMs on a Live Tournament

Over the 39 days of the 2026 FIFA World Cup, six frontier LLMs were asked before every kickoff to fill in a seven-market prediction card for all 104 matches, plus 12 group winners and a pre-tournament outright pool; no answer existed when the question was asked, so the evaluation is leakage-free by construction rather...

Zhenran Wang, Zhonghan Bian, Jinsong Li et al. · 0 citations