Anthropic's new Claude Fable 5 is a nerfed Mythos with guardrails attached

https://www.zdnet.com/a/img/resize/f962c257d0ea2dedee719f6ee2f6a5fb2f8e4e1a/2026/06/09/14025e90-f4bc-448b-a8ca-5aac1bdde994/anthropics-new-claude-fable-5-is-a-nerfed-mythos-with-guardrails...

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ZDNET's key takeaways

  • Anthropic is releasing Claude Fable 5 for general users.
  • Fable 5 uses Mythos-class power with safety controls.
  • Pricing is about twice that of Claude Opus 4.8.

Anthropic has announced a defanged version of its fabled (and highly restricted) Mythos large language model. Called Claude Fable 5, the company describes the new AI as "a Mythos-class model made safe for general use."

Mythos was introduced back in April to great fanfare as a model capable of finding vulnerabilities in code that neither experienced developers nor other AIs could find.

Also: Apple, Google, and Microsoft join Anthropic's Project Glasswing to defend world's most critical software

Offered as the central component of a Manhattan Project-like team effort called Project Glasswing, Mythos was considered far too dangerous to be allowed to fall into the wrong hands. As such, the...

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