Anthropic has launched Claude Fable 5, the first publicly available version of its advanced Mythos model. The model is designed to excel in software engineering, knowledge work, and vision tasks, but it includes safety measures to prevent misuse in high-risk areas. In sectors like cybersecurity, biology, and chemistry, the model blocks responses and defaults to Claude Opus 4.8. The release marks a significant step in making advanced AI accessible to a broader audience.
Fable 5 is available through Anthropic’s Claude API and consumption-based Enterprise plans. Access will be rolled out in stages, with the model included in Pro, Max, Team, and seat-based Enterprise plans through June 22. Starting June 23, users will need usage credits for Fable 5. Anthropic is also deploying a new version of Mythos, called Mythos 5, to approved organizations. The company emphasized that the model has been stress-tested with no universal jailbreaks found in over 1,000 hours of testing.
Anthropic warned that the rapid advancement of AI systems could lead to recursive self-improvement, prompting the need for safety measures. The company is implementing a 30-day data-retention policy for all traffic, even for enterprises with prior zero-retention agreements. This policy aims to defend against complex attacks and reduce false positives. The release of Fable 5 and Mythos 5 comes as Anthropic prepares to enter the public markets and calls for coordinated safety measures in AI development.
Source: techcrunch
