Grok-4 Heavy vs o4-mini
xAI vs OpenAI — benchmarks, pricing, and capabilities side by side.
- •Grok-4 Heavy has the higher intelligence index (89.3 vs 78.4)
| Grok-4 Heavy | o4-mini | |
|---|---|---|
| Intelligence index | 89.3 | 78.4 |
| Developer | xAI | OpenAI |
| Type | Multimodal | Multimodal |
| Access | API only | API only |
| Context window | — | 200,000 tokens |
| Input price | — | $1.10 / 1M |
| Output price | — | $4.40 / 1M |
| Speed | — | 115 tok/s |
| Released | July 9, 2025 | April 16, 2025 |
| Parameters | — | — |
| Input modalities | — | Text, Image |
| Output modalities | — | Text |
Shared benchmarks
Grok-4 Heavy
o4-mini
AIME 2025
100
92.7
GPQA Diamond
88.4
81.4
Humanity’s Last Exam
50.7
14.7
LiveCodeBench
79.4
85.9