supermarket

Language

Grok 4 Fast

By SpaceXAI (xAI), in the Grok family.

Released
19 Sep 2025
Status
Retired
Retired
15 May 2026
Context
2M
Max output
30K
Input per 1M tokens
$0.20
Output per 1M tokens
$0.50
Open weights
No
License
proprietary
Parameters
—
Knowledge cutoff
—
Reasoning
Yes
Modalities
text, image → text

Category scores

Out of 100, from independent and third-party results only, by method category-2026-09-29.1.

Category scores
CategoryScoreRankCoverage
Human preference35.4Not ranked2 of 5

Benchmark results

Every result we hold for this model, with who ran it and where it was published.

Knowledge & reasoning

Knowledge & reasoning results
BenchmarkMetricValueProvenanceSettingEvaluatedSource
DTBench (Decision Theory Benchmark)Accuracy (capability questions)82.7%Third party——https://conceptualreasoning.ai/dtbench via Epoch AI

Coding & software engineering

Coding & software engineering results
BenchmarkMetricValueProvenanceSettingEvaluatedSource
CybenchUnguided challenges solved30.0%Self-reported——Grok 4 Fast Model Card via Epoch AI
WeirdML (v2)Average accuracy42.9%Third party——https://htihle.github.io/weirdml.html via Epoch AI

Long context

Long context results
BenchmarkMetricValueProvenanceSettingEvaluatedSource
Fiction.LiveBench% correct at 16K tokens (Epoch's column)94.4%Third party——Fiction.live leaderboard via Epoch AI

Human preference

Human preference results
BenchmarkMetricValueProvenanceSettingEvaluatedSource
Code Arena: WebDev (arena.ai)Arena score (Elo scale)1160Independentreasoning25 Sep 2026Arena
Code Arena: WebDev (arena.ai)Votes743Independentreasoning25 Sep 2026Arena
Text Arena (arena.ai)Arena score (Elo scale)1405Independentreasoning25 Sep 2026Arena
Text Arena (arena.ai)Votes18151Independentreasoning25 Sep 2026Arena

Other Grok versions

Sources