← Artificial Acceleration
xAI · Grok
Grok 4 Fast
Released
19 Sep 2025
· 22 days after
Grok Code Fast 1
Intelligence
—
no index score yet
Price
$0.28
per 1M tokens, 3:1 in/out · $0.2 in / $0.5 out
Speed
—
not measured
Weights
Closed
US lab
xAI’s best score over time
12 Aug 2026
21 Sep 2026
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Grok Code Fast 1
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Grok 4.1 Fast