AI news story

Anthropic releases ‘safe’ version of Claude Mythos AI model to public

AI company restricted access to Fable 5, its most powerful Mythos model, for months over cybersecurity concerns Anthropi…

  • LLMs
  • Source: The Guardian AI
  • Published: 2026-06-09

Editor's take

Anthropic has made its most capable Mythos AI model, Fable 5, publicly available after a period of restricted access due to cybersecurity concerns.

This release signifies a shift in Anthropic's strategy, balancing the desire for broad adoption of their advanced models with the inherent risks of powerful AI. The decision to eventually open Fable 5 suggests Anthropic believes their safety mitigations are robust enough to warrant wider experimentation and use, a critical step for any major LLM provider aiming for widespread integration.

The focus will now be on observing real-world performance and any emergent vulnerabilities or misuse cases of Fable 5. Understanding how this "safe" version performs under diverse public scrutiny will be key to assessing the efficacy of Anthropic's safety protocols and informing the development of future, even more powerful, AI systems.