Anthropic Puts Claude Fable 5, Its Most Powerful Public Model, Into Claude Code
Anthropic released Claude Fable 5 on June 9 — its first publicly available Mythos-class model, scoring 10%+ over Opus 4.8 on some benchmarks and already selectable in Claude Code and GitHub Copilot. It is free through June 22, then roughly $10/$50 per million tokens, with cyber and biology prompts handed back to Opus 4.8.