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Jun 23 2026 Anthropic’s Fable 5 Model Jailbroken Within Days

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Fable 5 is the supposed safe version of Anthropic’s Mythos Preview, with guardrails to ensure that it can’t be used to create cyberattacks. Well, that restriction was bypassed within days. [...]

Posted by Bruce Schneier on Tue 23 June 2026 in Bruce Schneier.

Tags: Uncategorized, AI, cyberattack.

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