← Artificial Acceleration
Anthropic · Claude · Fable · Mythos
Claude 4 Sonnet
Released
22 May 2025
· 0 days after
Claude 4 Opus
Intelligence
—
no index score yet
Price
not priced
no list price
Speed
—
not measured
Weights
Closed
US lab
Anthropic’s best score over time
15 Oct 2025
7 Oct 2026
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Claude 4 Opus
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Claude 4.1 Opus