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Grok 4.1 Fast

Closed

Grok 4.1 Fast is an AI model from xAI.

Publisher
xAI
Family
Grok
Input
Output
License
proprietary
Released
19 Nov 2025

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Notes

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Attribution

Benchmark scores
AALiveBenchmatharenaprime-hubAfterQueryVals AI
Attribution policy →
Input
$0
/1M tok
Output
$0
/1M tok
Blended
$0
#1/ 414/1M · 3:1
Speed
0
#221/ 414tok/s

Price & speed via Artificial Analysis · ranked across tracked models

Reported on 30 evals across 12 domains - best 100.0% on Medpt · #1 of 2

Reported eval scores

30
Medpt100
Agent Diff Bench62
Hanabi11.8
Infraresolutionbench80.2
LiveBench - Language74.3
LiveBench - Reasoning80.2
LiveBench - Coding69.6
Terminal-Bench (Hard)14.4
LiveBench - Math83.7
IFBench36.5
LiveBench - Data Analysis52.2
LiveBench - Instruction Following28.2
LiveBench64.7
MMLU-Pro74.3
Humanity's Last Exam (HLE)5
τ²-bench (Tau²-bench)63.7
GPQA Diamond63.7
SciCode29.6
MedScribe77.5
MedCode28.1
LiveCodeBench39.9
IDE-Bench35
Vibe Code Bench v1.11.2
AIME 2025: Problems from the American Invitational Mathematics Examination34.3
ProofBench4
CorpFin v252.5
TaxEval v261.9
MortgageTax34.3
MathArena60.8
SAGE11.9