Anthropic Brings Mythos-Level AI to the Public With Claude Fable 5

Two months ago, Anthropic unveiled Claude Mythos Preview and immediately put limits on who could use it. Among those with limited access to the AI model via a programme called Project Glasswing were a small group of cybersecurity organisations and critical infrastructure providers.

The company argued that Mythos-class models had become powerful enough to create significant risks if misused, particularly in areas such as cybersecurity and advanced biological research. But it did make a promise to release models with Mythos-level capabilities more broadly if it could develop safeguards strong enough to prevent abuse.

Now, it seems the Claude creator may have found a workaround because on Tuesday, Anthropic launched Claude Fable 5, a new model it describes as Mythos-class and its most capable generally available AI system to date.

Anthropic says Fable 5 outperforms previous Claude models across software engineering, knowledge work, vision, scientific research, and long-running tasks. But unlike a typical AI launch, Anthropic is openly acknowledging the trade-offs involved. "Releasing a model this capable comes with risks," the company said in its announcement.