Evaluating Generalization Capabilities of LLM-Based Agents in Mixed-Motive Scenarios Using Concordia. - Chandler Smith; Marwa Abdulhai; Manfred Diaz; Marko Tesic; Rakshit S. Trivedi; Alexander Sasha Vezhnevets; Lewis Hammond; Jesse Clifton; Minsuk Chang; Edgar A. Duéñez-Guzmán; John P. Agapiou; Jayd Matyas; et al. (NeurIPS, 2025)