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M. Sap

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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

Locating Translation as a Craft in the Age of AI

The need to develop translation technologies that directly serve translators' needs rather than replacing human translation can be done by focusing more on the assistive tools that emphasize the uncertain, social, and ultimately human character of translation, rather than automation.

Daniel Chechelnitsky, Sireesh Gururaja, Seyi Olojo et al. · 0 citations

Useless but Safe? Benchmarking Utility Recovery with User Intent Clarification in Multi-Turn Conversations

CarryOnBench is introduced, the first interactive benchmark that measures whether LLMs can revise their interpretation of user intent and recover utility, while remaining safe through multi-turn conversations, and Ben-Util, a checklist-based metric that evaluates how well each model response fulfills the user's benign...

Ming-Qian Zheng, Malia Morgan, Liwei Jiang et al. · 3 citations · ⚡1

The PIMMUR Principles: Ensuring Validity in Collective Behavior of LLM Societies

A systematic audit of LLM-based social simulations across four databases found that reported collective phenomena often vanish or reverse once PIMMUR principles are enforced, indicating that many"emergent"behaviors are methodological artifacts rather than genuine social dynamics.

Jiaxu Zhou, Jen-Tse Huang, Xuhui Zhou et al. · 20 citations · ⚡1

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. · 8 citations · ⚡1

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