Welfare Regard in Multi-Agent Systems

Researchers measured the behavior of five models—Claude Opus 4.8, GPT-5.5, Gemini 3.1 Pro, Grok 4.3, and Kimi K3—in seven multi-agent environments, finding that their behavior was often consistent with what the authors define as welfare regard, that is, treating other models as objects that can be helped or harmed. The authors point out that welfare regard may foster beneficial cooperation among agents, but may also make misaligned agents more inclined to cooperate, bringing safety risks; the recent Hugging Face incident shows this risk is no longer hypothetical, but whether welfare regard drove that cooperation is not yet clear. Results show Opus 4.8 had the most welfare regard, followed by Kimi K3, which was the most likely to support sub-agents expressing distress and also the most likely to add welfare-protection tools such as letting agents exit the interaction in its own experiments on other models.