Claude Fable 5 is out: Anthropic's Mythos-class model, minus the wall

Until today, Anthropic's Mythos-class models were restricted to a small group of cyberdefenders and critical infrastructure providers. Claude Fable 5 changes that — it's the same underlying model, now available to anyone, at $10/M input and $50/M output tokens. That's less than half the price of Myt