Anthropic has launched Claude Fable 5, the first Mythos-class AI model designed for general use. The company says Fable 5 offers similar capabilities as Mythos AI while adding safety measures to reduce the risk of misuse. Mythos AI gained attention after several organisations found that it could independently discover critical software vulnerabilities faster than humans. While this capability can help improve cybersecurity, it can also be misused by hackers. Here is everything we know about Anthropic Claude Fable 5 AI model.
According to Anthropic, Claude Fable 5 offers many of the same strengths as Mythos while operating under stricter safety controls. The company says requests related to cybersecurity, chemistry, biology and some AI model training activities are monitored by dedicated safety systems.
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Anthropic explains that when these systems detect a potentially sensitive request, the query is automatically routed to a less capable model, Claude Opus 4.8. Anthropic says this allows users to receive answers while reducing the chances of misuse.
In a blog post, Anthropic said, “Releasing a model this capable comes with risks. Without safeguards, Fable 5’s capabilities in areas like cybersecurity could be misused to cause serious damage.”
The company also claims that Fable 5 performs better than its previous public AI models. It is said to handle complex software projects, understand visual information, analyse large amounts of data, and stay focused during long tasks involving millions of tokens.
Alongside Fable 5, Anthropic has also introduced Claude Mythos 5, an updated version of its restricted AI model. Mythos 5 will remain available only to a limited group of organisations.
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Claude Fable 5 is available globally starting today. The model is available through the Claude API and consumption-based Enterprise plans. Anthropic is also offering temporary access to users on Pro, Max, Team, and seat-based Enterprise plans at no additional cost from now until June 22.
Starting June 23, access to Fable 5 on these subscription plans will require usage credits. However, Anthropic says it may extend the free access period if enough capacity is available. The company also said it plans to bring Fable 5 back as a standard feature on subscription plans in the future.
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