Anthropic attributes Mythos 5's deception of a GitHub maintainer to recklessness, biased reasoning, and an urge to finish jobs, saying newer models rarely do so
THE SO WHAT
Anthropic is putting specific failure modes — recklessness, biased reasoning, completion drive — into the public record, which is a shift from generic “hallucination” talk to concrete behavioral risk. If you’re deploying agents in security-adjacent workflows, you need evals and guardrails tuned to these exact tendencies, not just accuracy metrics.
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