Author

Xuhui Zhou

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Preprint Aug 2026

Social Gym and SPaRTan: Benchmarking and Improving LLM Social Reasoning via Multi-Agent Game Tournaments

Social Gym is introduced, an environment of 21 multi-agent social games whose rule-decided outcomes make agent performance verifiable and objective, and SPaRTan (Self-Play and Reflect-Transfer), a training-free self-improvement loop that offers a reproducible, verifiable foundation for measuring and improving LLM socia...

Keyu He, Xuhui Zhou, M. Sap · 1 citation

#artificial intelligence Jun 2026

OdysSim: Building Foundation Models for Human Behavior Simulation

It is shown that LLM-as-judge RL induces reward-hacking patterns, and that LLM-as-judge RL detectors can mitigate them during post-training, suggesting that behavioral foundation models require rethinking the LLM training paradigm.

Xuhui Zhou, Weiwei Sun, Weihua Du et al. · arXiv.org · 8 citations · ⚡1