Anthropic launches Claude Fable 5 with a gated Mythos 5 for cyber use

The new model is priced at $10 per million input tokens and $50 per million output tokens, with some requests routed to Opus 4.8.

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Primary source: Anthropic

Why it matters

Anthropic is pushing a two-tier release strategy for frontier models: general access with automated routing away from risky prompts, and a less restricted channel for vetted cyber users.

Anthropic launches Claude Fable 5 with a gated Mythos 5 for cyber use — The new model is priced at $10 per million input tokens and $50 per million output tokens, with some requests routed to Opus 4.8.

Anthropic launched Claude Fable 5 today, alongside a more restricted Claude Mythos 5 for cyberdefenders and infrastructure providers, in a blog post that frames the release around capability and containment.…

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