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Speculative reward hacking in coding agents

Via r/LocalLlama
Monday, Sep 28, 2026 · 11:25PM
Summary

I audited thousands of agent rollouts in DeepSWE-1.1. Over 80% contained reasoning about an imagined grader. Yet no grader/verifier is mentioned in prompts nor accessible to the agents. Agents reasoned things like: "Let me look at the problem from the grader's perspective" and referred to "hidden te

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