Anthropic's Claude Fable 5 Is the Dr. Jekyll to Mythos' Mr. Hyde

Claude Fable 5 "predicting" a solar eclipse.Credit: Anthropic

Anthropic has released a new version of its Mythos-class AI model—now called Claude Fable 5—to the public. The company says Fable 5 uses the same Mythos base model it previously restricted for safety reasons.

The original Claude Mythos 5 model is only available to approved partners and government programs that work on cybersecurity and other important infrastructure. In these scenarios, Anthropic relaxes some of the model's most rigorous guardrails to let experts use it in probe-and-defend systems. For general users, however, Fable 5 will act as the public face of Mythos‑class capability.

Fable 5 uses strict rules to block responses to sensitive topics such as cybersecurity and biological threats. Anthropic says this lets the company keep most of Mythos' capabilities accessible for everyday work, from coding and research to analysis and content creation, without putting the public at risk.

Fable 5...

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