Anthropic Releases Claude Fable 5.2 and Mythos 5.2 With Pre-Release Research Results

Key Info

Anthropic announced that Claude Fable 5.2 is available today on all paid plans, while Claude Mythos 5.2 access is application-based for organizations working on cybersecurity or biomedical research. Pre-release testing showed both models tackling ambitious projects across multiple fields.

Highlights

• From a one-paragraph prompt, Fable 5.2 designed three working electronic devices, including a home voice assistant hub.
• The models produced two physics results written up as preprints: one on the abrupt transition in very small universes, another on the exact limit of a technique used to rule out candidate quantum gravity theories.
• Fable 5.2 is available immediately on all paid plans.
• Mythos 5.2 access is open to organizations pursuing beneficial applications in cybersecurity or biomedical research via application.