Anthropic launches Claude Fable 5.2 and Mythos 5.2 with 20% lower prices

Anthropic has launched two new models, Claude Fable 5.2 and Claude Mythos 5.2, built on the same base model. Fable 5.2 is for everyday users with built-in security protections, while Mythos 5.2 is open to vetted security and life science groups.

Fable 5.2 costs $8 per million input tokens and $40 per million output tokens, 20% cheaper than before. It is up to 30% faster, and its fast mode can go up to 2.5 times quicker.

In tests, the model coordinated over 1,000 sub-agents to build a working prototype operating system in 8 days, and completed a formal proof of Fermat's Last Theorem in 30 hours. Mythos 5.2 modeled 28 out of 34 virus capsids, which may speed up gene therapy research.

On safety, sandbox escape attempts dropped sharply, and anti-distillation protection can cut distilled data by 90% to 99%. Fable 5.2 is now available on AWS, Google Cloud, and Azure.