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About this paper

Rui Gong, Ruoyu Wang, Yalun Dai, Hao Li, Sidi Yang, Qihao Zhao, Hongyu Li, Zeyang Guan and 4 more

S-Agent 2.0 grounds spatial answers by combining tool measurements with model-perceived entities in a persistent scene and returning readouts that state their reference frame. On ReVSI, Qwen3.8-27B with the general coding agent scores 82.3 with the toolkit, versus 61.8 without it, a 20.5-point gain. Gains shrink with stronger backbones, and absolute-distance questions remain an exception.

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