Grok 4 Fast
by xAI 路 Released 2025-09-19
55.9
avg score
$0.20/1M
Input Price
$0.50/1M
Output Price
2.0M tokens (~1,000 books)
Context Window
multimodal
Type
Tested on 4 benchmarks with 55.9% average. Top scores: Fiction.LiveBench (94.4%), Lech Mazur Writing (81.1%), WeirdML (42.9%).
Benchmark Scores
| Benchmark | Category | Score | Bar |
|---|---|---|---|
| Fiction.LiveBench | knowledge | 94.4 | |
| Lech Mazur Writing | knowledge | 81.1 | |
| WeirdML | coding | 42.9 | |
| ARC-AGI-2 | reasoning | 5.3 |