Grok 4.1 Fast

xAI

Verified against Artificial Analysis · Jul 13, 2026

Capability

percentile index

Price /M

$0 / $0

in / out

Context

—

Avg score

64.2

10 benchmarks

AA Intelligence

30.6

index

Weights

Closed

Released

Nov 19, 2025

About

Grok 4.1 Fast is a proprietary model in the Grok family from xAI. Benchmarked on 10 evals, averaging 64.2.

Benchmark scores · 10

avg 64.2 — higher is better

τ²-benchartificial-analysis · 2026-07

93.3

AIMEartificial-analysis · 2026-07

89.3

MMLU-Proartificial-analysis · 2026-07

85.4

GPQA Diamondartificial-analysis · 2026-07

85.3

LiveCodeBenchartificial-analysis · 2026-07

82.2

AA Long-Context Reasoningartificial-analysis · 2026-07

IFBenchartificial-analysis · 2026-07

52.7

SciCodeartificial-analysis · 2026-07

44.2

Terminal-Bench Hardartificial-analysis · 2026-07

24.2

Humanity's Last Examartificial-analysis · 2026-07

17.6

Details

PublisherxAI

FamilyGrok

Parameters—

License—

WeightsClosed

ReleasedNov 19, 2025

History

full ledger →

Capability over time

Append-only ledger — every observed change to this model's numbers.

API providers

Artificial Analysis$0/M