Anthropic says these fallbacks occur in fewer than 5% of sessions, meaning most users will effectively interact with the full Mythos-class model during ordinary use. Early testing by security ...

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The broad safeguards built into Anthropic's Claude Fable 5, a Mythos-class AI model, blocks some mundane requests on cybersecurity and biology.

Anthropic on Tuesday released Claude Fable 5, a new Mythos-class model that the AI company has made safe for general and larger use. Fable 5’s capabilities exceed those of any generally available ...

Further, for specialised security professionals who need the guardrails lifted, Anthropic also launched Claude Mythos 5 – the exact same model as Fable 5 but with the defensive boundaries removed for ...

Anthropic has announced Claude Sonnet 5, a Sonnet-class model designed for agentic AI workflows. It is built to plan tasks, ...

Back in April, Anthropic unveiled its Claude Mythos AI model that it said was too powerful to publicly release. Instead, the company has shared access with software vendors, including Apple, in an ...

For developers, Fable 5 is available through the Claude API as claude-fable-5. Anthropic says Fable 5 is fully available today on the Claude API and on consumption-based Enterprise plans. For ...

Did our AI summary help? Anthropic has opened public access to Fable 5, describing it as the first widely available model from its most advanced Mythos family while placing significant restrictions on ...

Anthropic's new Claude Fable 5 is the same base model as Mythos but with guardrails attached ...

As AI models get more powerful, there’s also going to be a level of danger. Anthropic announced Mythos not long ago as a model that was too dangerous for public availability, but a new version of that ...

Anthropic launched Claude Fable 5 on June 9, 2026, calling it the most capable model it has ever released to the general public. Alongside it, the company released Claude Mythos 5 for a small group of ...