Anthropic has introduced Claude Fable 5 and Claude Mythos 5, marking the public debut of its new Mythos-class family of AI models. Claude Fable 5 is the company’s most capable publicly available model, designed for advanced software engineering, scientific research, visual understanding, and complex knowledge work.
Anthropic says the model can sustain longer autonomous workflows and perform better on difficult, multi-step tasks than previous Opus models. To reduce misuse risks, Fable 5 includes safeguards that restrict responses in sensitive areas such as cybersecurity, biology, and chemistry.
Anthropic is also providing access to the less restricted Mythos 5 model through Project Glasswing and a trusted access program for qualified organizations.
