Grok 4 Fast
ECI#90
144Grok 4 Fast is a closed-weights model from xAI, released September 19, 2025. It has an ECI score of 144 and ranks 90th of 257 tracked models. At the time of its release, it ranked 8th of 162 tracked models.
Grok 4 Fast vs select alternatives
| Domain | Benchmark | Grok 4 Fast | |||
|---|---|---|---|---|---|
ECI scoreBest score 167 | 144 | 140 | 146 | 144 | |
| Ranking | #90 | #114 | #75 | #92 | |
| Conceptual reasoning | ARC-AGI-2Best score 95% | ||||
ARC-AGI-1Best score 99% | |||||
DTBenchBest score 99% | |||||
| Long context | ForecastBenchBest score 62.5 | 60.5 | — | 60.9 | 62.0 |
Fiction.liveBenchBest score 97% | |||||
| Software engineering | Text Arena (Coding)Best score 1820 | 1149 | — | — | 1389 |
CybenchBest score 93% | |||||
WeirdML (v2)Best score 94% |
