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News/A False Average: Pooled CoT-Monitor Accuracy Conceals a Reasoning-Dependent Fragility
arxiv
PublishedOctober 28, 2026 at 4:00 AM

A False Average: Pooled CoT-Monitor Accuracy Conceals a Reasoning-Dependent Fragility

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arXiv:2608.00583v4 Announce Type: replace-cross Abstract: Chain-of-thought (CoT) monitors are reported by their aggregate accuracy on a pool of reward hacks. We show that this number is a false average. On Terminal Wrench, about 77% of hacks are given away by the actions alone, and the monitor's poo

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