One brutal Minecraft night scared 50 AI agents into inventing chicken handoff protocols, a Fertilizer Officer, and fishing shifts
In a three-hour "Civ50" Minecraft experiment, 50 GPT-6.1 Sol agents exchanged about 5,900 messages, lost 22 agents on the first night, and then adopted extreme caution, ration lists, fishing shifts and a written handoff protocol after a tossed chicken was accidentally eaten. In separate Bed Wars and Mindustry matches, GPT agents beat Claude Opus 5.5 6-3 and 6-1 respectively, communicating far more and downloading Mindustry's public source code to refine tactics, while Claude agents misread a block-breaking bug and never searched for game code. The researchers released the Mindustry environment and Multi-Agent Harbor framework as open source, arguing such simulations can surface risky swarm behaviors before they reach production systems.