Schneier - Anthropic’s Fable 5 Model Jailbroken Within Days

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.



from Schneier on Security https://www.schneier.com/blog/archives/2026/06/anthropics-fable-5-model-jailbroken-within-days.html

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