Among Us: A Sandbox for Measuring and Detecting Agentic Deception

Satvik Golechha, Adrià Garriga-Alonso — 2025-04-05 — arXiv

Summary

Introduces a sandbox social deception game for evaluating long-term deceptive behavior in LLMs, evaluates 18 models finding RL-trained models better at producing than detecting deception, and develops interpretability-based detection methods (probes and SAE features) achieving >95% AUROC.

Key Result

Probes trained on synthetic dishonesty prompts generalize extremely well out-of-distribution, consistently obtaining AUROCs over 95% for detecting deceptive statements even without chain-of-thought reasoning.

Source