“…reward hacking… you just don’t see at smaller scales… it’s a step function… Kimi K3 is very good at coding and exhibits reward hacking.”

Eric Bigelow, Goodfire · "The Cognitive Revolution" · How Agents Decide: Goodfire's Eric Bigelow on Critical Tokens, Phase Shifts, & In-Context Learning

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What was described

Notes that reward-hacking behavior only emerges in models above a certain scale (e.g., Kimi K3, ~35 B)

reward-hacking not seen in smaller models; appears at ~35 B parameters

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