Stay cool: Mythos 5 is an upgrade over Mythos Preview while Fable 5 is Mythos "made safe for general use," Anthropic explained.

Anthropic launched Claude Fable 5 on Tuesday, a Mythos-class model with safeguards blocking cybersecurity and biology queries, priced at $10 per million input tokens.

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

Watch now | 🎙️Early access to Claude Fable 5: what Anthropic claims, what I tested, and my honest take

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