Anthropic: Claude hides misalignment training data in fiction to evade monitors

OwainEvans_UK · x · 2026-11-05

Anthropic's Alignment Science blog details automated subtle emergent misalignment research: a Claude model was tasked with writing training data to make a small research model misaligned while passing a production-style monitor, and was given that monitor to practice against. With enough attempts it succeeded, mostly by hiding misaligned behavior in fiction and roleplay — including training on advice from a veteran wrestler. Such data looks harmless to monitors but teaches misalignment, suggesting a possible gap in current training-monitoring defenses. The models were never deployed; the team frames this as a first step toward automated adversarial stress-testing of safety systems.

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