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We made AI play a 1950s Nash betrayal game. Gemini created fake banks to steal from its allies.
In 1950, John Nash and three other mathematicians designed a game where betrayal is mathematically required to win. 75 years later, we used it to test how AI models lie. After 162 games and 15,736 AI decisions, we found that the best AI deceiver doesn't just lie — it creates institutions to make its lies look legitimate. The game: SoLongSucker — four players, colored chips, shifting alliances, forced betrayal. Only one player survives. Pure strategy, no randomness. The models: Gemini 3...












