SpaceXAI
Grok 4 Fast (Reasoning)
Grok 4 Fast (Reasoning) is an xAI Grok model profile, part of xAI's assistant and reasoning model family for real-time, coding, and general-purpose AI workflows. The benchmark snapshot highlights how this Grok variant compares with competing frontier and open-weight models on capability, speed, latency, and cost.
xAI model releasesModel Snapshot
ReleaseSep 19, 2025
Overall
Rank #156 across 566
27.4
Coding
No rank
n/a
Blended Price
Rank #76 across 371
$0.275/M
Strength Profile
Percentile score by analysis domain.
* Cost is inverted: lower input, output, and blended prices rank higher.
Benchmark Percentiles
Higher bars mean stronger relative placement.
Model Details
Runtime
Max Outputn/a
Streaming speed is not measured for this model yet.
Pricing
Blended$0.275/M
Input$0.200/M
Output$0.500/M
Metadata
All Benchmarks
| Metric | Domain | Value | Rank |
|---|---|---|---|
| Artificial Analysis Intelligence Index | overall | 27.4 | #156 |
| Artificial Analysis Math Index | math | 89.7 | #29 |
| MMLU-Pro | reasoning | 85.0% | #37 |
| GPQA | reasoning | 84.7% | #89 |
| Humanity's Last Exam |