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YC Labs and Olam Labs study 50 AI agents building a civilization in Minecraft

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YC Labs and Olam Labs released a report, Agents in Games, on 29 October 2026, describing an experiment with 50 agents running on GPT-6.1 Sol in a Minecraft survival world. Over three hours the agents were tasked with building a thriving civilization, using a custom open-source harness. The colony recorded 34 deaths, 22 of them during the first night, and shifted toward cautious survival and administration while exchanging about 5,900 messages. The agents also invented formal roles and permissions for themselves, and the report includes adversarial tests where GPT-based and Claude-based agents competed in Bed Wars, with the researchers presenting the results as descriptive rather than a model ranking.

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