YC and Olam Labs run a civilization experiment with 50 GPT-6.1 Sol agents in Minecraft

YC Labs, in collaboration with Olam Labs, conducted multi-agent experiments in Minecraft and Mindustry, and open-sourced a self-built Minecraft agent harness (github.com/yc-software/minecraft-agent-harness). In the Civ50 experiment, 50 GPT-6.1 Sol agents ran for 3 hours in a survival world with the goal of building a prosperous civilization, sending a total of about 5,900 messages and spontaneously forming a hierarchy based on directory order, a rationing ledger, and written rules; 22 of the 34 deaths on the first night occurred, after which the agents clearly tended toward risk avoidance. The experiment also recorded collaboration details such as fishing division of labor and a food rationing ledger.