Anthropic · Claude · Fable · Mythos

Claude Sonnet 4.6

Released 17 Feb 2026 · 12 days after Claude Opus 4.6

Intelligence

—

no index score yet

Price

$6.00

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

Speed

—

not measured

Weights

Closed

US lab

Anthropic’s best score over time