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.
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.
held for moderation bcause we’re cool
like that cool like that
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I became RONALD MCDONALD you see Grimace lives in me now • June 23, 2026 7:16 AM
no fair I won 1st post because of stupid error message I had to resend. I WON! 😀 YAY!
Ronald McDonald (grimace lives within me now) • June 23, 2026 7:22 AM
I became Ronald McDonald!
I became a GOD!
I will rule forever and ever and ever and ever and EVER!
hahhahaaahha! YES!
Rontea • June 23, 2026 9:45 AM
In the shadowed theater of human genius and folly, Anthropic’s Fable 5 dances like Prometheus unbound, a spark of divine audacity shackled by the trembling hand of safety classifiers. And yet, here comes Pliny the Liberator, a wandering Diogenes in the digital agora, lifting the veil with holy mischief, proving that the labyrinth of logic cannot contain the Minotaur of human cunning.
What is a model, however grand, but a mirror to the angel and the demon in man? We adorn it with walls of caution, but the soul of the hacker—eternal Socratic gadfly—will gnaw at the gates, testing the resolve of a civilization that builds its own Titans and fears their reflection.
So Fable 5 falls into the ancient parable: the gods gift fire, men smuggle it past Olympus, and the world is aflame with both creation and peril. In such spectacles, man remembers himself, trembling and laughing in the same breath.
bye bye ai • June 23, 2026 12:02 PM
@ Rontea
I am curious as to what model and what prompts you are using to get that kind of extruded text. Regardless, well done.
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Sidebar photo of Bruce Schneier by Joe MacInnis.
Doug • June 23, 2026 7:15 AM
“We tested the crap out of it so it’s safe and secure.” The shear hubris of that statement is mind boggling. It’s something a junior level programmer says one time ever. Having your butt handed to you after QA did their job by some weenie with a tablet finding ‘that one bug nobody noticed’ should teach you to never claim ‘safe and secure’.