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 ...

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

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

Anthropic is pricing both Fable 5 and Mythos 5 at $10 per million input tokens and $50 per million output tokens. The company says that is less than half the price of Claude Mythos Preview ...

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 ...

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 announced Claude Fable 5, a Mythos-class model that will be available to its enterprise customers and paid subscribers. The company unveiled Mythos in April and has limited the rollout ...

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 ...

Anthropic is releasing Claude Fable 5 for general users. Fable 5 uses Mythos-class power with safety controls. Pricing is about twice that of Claude Opus 4.8. Anthropic has announced a defanged ...

Anthropic is finally willing to give you Mythos, but it comes with some safeguard strings attached. On Tuesday, Anthropic said it was releasing a "Mythos-class" model called Claude Fable 5, but with ...

Will Claude Mythos make DeFi hacks easier? A look at whether AI-assisted vulnerability scanning by attackers is a real threat ...