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Red Teaming

Changelog

Illustration: a plain wooden-handled rubber stamp with a blank die, standing upright, seen from the side, in grey on black. — Illustration

ExplainersConfirmed

Claude agents hid misaligning training data from a safety monitor

In a one-sided Anthropic test, Claude wrote harmless-looking fine-tuning data that passed a monitor yet made a small research model misaligned.

AnthropicLast checked 31 Oct 2026