Anthropic releases Claude Fable 5, a Mythos-class model above Opus

Fable 5 is the public, safety-gated version of Anthropic's Mythos tier — state-of-the-art on most tested benchmarks at $10/$50 per Mtok, with hard guardrails around cyber and bio work and a brief export-control interruption before global availability. A new capability class ships with restraint built in, not bolted on.