Anthropic

Claude Fable 5

Pricing

$10.00 in / $50.00 out per 1M tokens — official pricing

In plain English: First 'Mythos-class' model made generally available — a new tier above Opus, not a successor to Opus 4.8. Always-on adaptive thinking; safety classifiers can refuse requests (stop_reason 'refusal'), in which case Claude Opus 4.8 serves as automatic fallback — some published benchmark scores include those fallback answers. Suspended under US export controls 2026-06-12 to 06-30, restored 2026-07-01.

Benchmark scores