Anthropic · Claude · Fable · Mythos

Claude Fable 5

Released 9 Jun 2026 · 12 days after Claude Opus 4.8

notable release

New Mythos tier above Opus. Four days after the pause proposal.

Intelligence

—

no index score yet

Price

$20.00

per 1M tokens, 3:1 in/out · $10 in / $50 out

Speed

—

not measured

Weights

Closed

US lab

Anthropic’s best score over time