Anthropic · Claude · Fable · Mythos

Claude 4.1 Opus

Released 5 Aug 2025 · 75 days after Claude 4 Sonnet

Intelligence

—

no index score yet

Price

$30.00

per 1M tokens, 3:1 in/out · $15 in / $75 out

Speed

—

not measured

Weights

Closed

US lab

Anthropic’s best score over time