Claude Fable 5 is out: Anthropic's Mythos-class model, minus the wall (opens in new tab)  🧠Claude  6 articles covering this post

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 Mythos Preview. And the capabilities are a genuine step change. "Stripe reported that Fable 5 compressed months of engineering into days. In a 50-million-line Ruby codebase, the model performed a code...