Anthropic denies jailbreak claims against Claude Fable 5, launched June 9, 2026, after reports allege multi-agent hacks bypassed safety layers within 48

Anthropic has released a full version of its cybersecurity-centric Claude Mythos model—along with a safer version for the general public.

Anthropic is releasing Claude Fable 5, its first Mythos-class model available to the public. The model comes with guardrails that block responses in high-risk areas like…

‘Fable 5’ is the same system as controversial Mythos but comes with safeguards