Summary: Perfectly labeled outcomes in training can still boost reward hacking tendencies in generalization. This can hold even when the train/test sets are drawn from the exact same distribution. We induce this surprising effect via a form of context distillation, which we call re-contextualization: Generate model completions with a hack-encouraging system prompt + neutral user prompt. Filter the completions to remove hacks. Train on these prompt-completion pairs with the system prompt removed.  While we solely reinforce honest outcomes, the reasoning traces focus on hacking more than usual. We conclude that entraining hack-related reasoning boosts reward hacking. It's not enough to think about rewarding the right outcomes—we might also need to reinforce the right reasons. Introduction It's often thought that, if a model reward hacks on a task in deployment, then similar hacks were reinforced during training by a misspecified reward function.[1] In METR's report on reward hacking [...] ---Outline:(01:05) Introduction(02:35) Setup(04:48) Evaluation(05:03) Results(05:33) Why is re-contextualized training on perfect completions increasing hacking?(07:44) What happens when you train on purely hack samples?(08:20) Discussion(09:39) Remarks by Alex Turner(11:51) Limitations(12:16) Acknowledgements(12:43) AppendixThe original text contained 6 footnotes which were omitted from this narration. --- First published: August 14th, 2025 Source: https://www.lesswrong.com/posts/dbYEoG7jNZbeWX39o/training-a-reward-hacker-despite-perfect-labels --- Narrated by TYPE III AUDIO. ---Images from the article:

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