Authors

Sansheng Cao

Publications 2

Preprint Open access

Looking Inside LLMs: Small-World Connectivity as a Signature of Reasoning Performance

Zheng Huang, Sansheng Cao, Enpei Zhang et al. · 2026

Understanding large language model (LLM) reasoning requires looking beyond behavioral performance to examine how reasoning ability is reflected in internal organization. Inspired by neuroscience findings linking higher intelligence to stronger small-world organization in functional brain networks, we investigate small- …

Preprint Open access

$S^3$: Spectral Null-Space Swap Makes Reasoning Models Efficient

Hongbo Ma, Sansheng Cao, Jiajun Fan et al. · 2026

LLMs trained with Chain-of-thought excel in reasoning capability, but often come with excessive token cost. We find that the core of reasoning capacity lies in the Thinking model's weight component within the null space of a projection defined by the corresponding Non-thinking model's dominant singular directions, and …

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