Anthropic publicly releases Claude Fable 5, its most capable model yet

Anthropic launched Claude Fable 5, the first publicly available version of its Mythos-class model, just days after warning that AI is becoming dangerously capable. The company says it sets state-of-the-art marks across software engineering, knowledge work, and vision, priced at $10 per million input and $50 per million output tokens — less than half its preview. In high-risk areas like cyber, bio, and chemistry the model refuses and falls back to Claude Opus 4.8, with the safeguards triggering in under 5% of sessions.