Anthropic’s Fable 5 Model Jailbroken Within Days

June 23, 2026

1 Min Read

cplexmath

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.

Sidebar photo of Bruce Schneier by Joe MacInnis.

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