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.
Comments
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!
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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’.