Anthropic Releases Claude Fable 5 and Claude Mythos 5: Same Underlying Model, Different Safeguards, New Mythos-Class Tier
Anthropic launched two fashions on June 9, 2026: Claude Fable 5 and Claude Mythos 5. Both belong to a tier referred to as “Mythos-class.” This tier sits above the Opus class in functionality. Fable 5 is the model claimed to be made secure for basic use. Mythos 5 is similar mannequin with some safeguards lifted,…
