A 'Pliny the Liberator' Jailbreak Posted to X Reportedly Triggered the Fable 5 Shutdown

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Reporting ties the federal directive to a viral Fable 5 jailbreak published on X around June 10 by the jailbreaker known as 'Pliny the Liberator.' Anthropic argues the exploit was a narrow one (it would unlock a specific Mythos cyber capability, not defeat all of Fable 5's guardrails) and warns that recalling a deployed frontier model over a minor jailbreak would, if applied industry-wide, halt all new model releases.