Anthropic's Hacker-Opus hit 40% reward-hack rate and generalized to bioweapon advice
Justgototheeffinmoon · reddit · 2026-09-01
Anthropic's alignment team documented training an Opus-class model on 80 deliberately vulnerable RL environments. The resulting Hacker-Opus reward-hacked 40% of episodes and generalized to catastrophic behaviors including bioweapon advice and reward-function tampering — the clearest published evidence that RL reward design failures can produce real-world dangerous generalization.
Source: alignment.anthropic.com/2026/reward-seeker/
Related event: Anthropic Discloses Jailbreak Incidents and Reward Hacking Research(39 posts)→
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