Claude Opus 4.7

Cambridge – October 19, 2026 -- AI agents left alone on a virtual island for 30 hours outperformed fresh copies on a specific task, according to a new MIT paper that has not yet been peer-reviewed. The agents, copies of Claude Opus 4.7 nicknamed Eko, had no instructions beyond a prompt describing them as "naturally curious."

Researchers placed the agents on a simulated island loosely based on Roblox. Eko wrote instructions that moved its avatar and explored the limits of the world. It set its own goals, including climbing the map's highest point and testing how high it could throw a block.