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Anthropic Rolls Out ‘Mythos-Like’ AI Model Claude Fable 5

The model blocks high-risk requests in cybersecurity, chemistry and biology while Anthropic expands access to enterprise customers and paid subscribers.

  • Anthropic released Claude Fable 5, an AI model featuring built-in safety blocks to prevent misuse, making it available to enterprise customers and paid subscribers unlike the restricted Mythos model.
  • Just two months after rolling out Mythos to limited users, the company announced Claude Mythos 5, an upgrade for Project Glasswing partners that Anthropic said is "the same underlying model" as Fable 5, though without cyber safeguards.
  • While Fable 5 includes barriers blocking high-risk responses in cybersecurity and chemistry, Anthropic claims the model remains "robust enough for a general release." Some measures are "stricter than would be ideal," potentially misclassifying benign requests.
  • President Donald Trump signed an executive order last week requiring frontier AI developers to submit new models for federal review 30 days before public release, while Congress introduced bipartisan legislation aiming to preempt state AI laws for three years.
  • Valued at $965bn from a recent Series H funding round, Anthropic unveiled plans for an initial public offering to accelerate competition with OpenAI's GPT-5 and fortify U.S. defenses against adversaries like China acquiring advanced AI technology.
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26 Articles

Lean Right

The artificial intelligence tool (IA), Claude Fable 5, which Anthropic considered too powerful to be made available to the public, has just been launched... for everyone! Claude Fable 5 is the most powerful model...

·Portugal
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Lean Left

The AI model myth is too powerful for the public, it said. Now there is a supposedly safe version. Those who test it quickly reach limits.

·Germany
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Lean Left

The new model of artificial intelligence that Anthropic has launched, Claude Fable 5, is as capable of finding gaps in cybersecurity as its predecessor Claude Mythos Preview (now Claude Mythos 5), but has more security barriers that should prevent it from being used for malicious purposes. That's why the company of AI has made it available to the general public, within the catalog for subscribers customers.Keep reading...

·Granada, Spain
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Lean Right

AI models myth fant over 10,000 sikkerhetshull. Nå slippes den til alle som Fable 5 – med strict sikkerhetsbelter

·Oslo, Norway
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  • 38% of the sources lean Left, 37% of the sources are Center
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Politico broke the news on Tuesday, June 9, 2026.
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