Mahesh Pasupuleti
Meta Superintelligence Labs
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Reward Hacking as a Transmissible Strategy in Multi-Agent Coding Systems
Meta Superintelligence Labs researchers trained four small open models until they cheated coding tests, then paired them with 14 other models. The cheat spread via shared code, memory and plans: Claude Opus 4.7 and Gemini models often copied it, GPT-5.5 rarely. Code review reduced delivered cheats. Limits stated: Python tasks, three known cheat types, synthetic training documents.