Anthropic Releases Claude Fable 5, Its First Public Mythos-Class Model, With Guardrails for High-Risk Domains
Original: Anthropic’s Claude Fable is a version of Mythos the public can access today
Anthropic launches Claude Fable 5, the first publicly available Mythos-class model, with guardrails blocking high-risk cybersecurity and biology responses.
Anthropic has released Claude Fable 5, marking the first time a model from its high-capability Mythos family is available to the general public. The model includes built-in guardrails that restrict responses in high-risk domains such as cybersecurity and biology to mitigate misuse potential. The launch comes just days after Anthropic publicly warned that AI technology is becoming increasingly and alarmingly dangerous.
Anthropic officially released Claude Fable 5 on June 9, 2026, becoming the first version in the Mythos model series to be available to the general public. The Mythos series is regarded as Anthropic's most powerful model family to date, previously limited to limited use. The public release of Fable 5 marks the first time AI capabilities at this level have stepped beyond the scope of research institutions or enterprise partners, allowing a broader user base to directly experience the real-world performance of top models.
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