Grok 4 Fast

Name: Grok 4 Fast
Author: xAI

Closed

Grok 4 Fast is an AI model from xAI.

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Notes

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Attribution

Input

$0.20

/1M tok

Output

$0.50

/1M tok

Blended

$0.28

#255/ 461/1M · 3:1

Speed

#115/ 461tok/s

Price & speed via Artificial Analysis · ranked across tracked models

Reasoning effort	Index	Speed
Reasoning	27.9	0 t/s
Non-reasoning	16.6	0 t/s

Intelligence Index per reasoning-effort setting, via Artificial Analysis · pricing identical across tiers

Reported on 20 evals across 11 domains - best 81.6% on MedScribe · #33 of 72

Reported eval scores