Grok-4 Heavy vs o3 Pro
xAI vs OpenAI — benchmarks, pricing, and capabilities side by side.
- •Grok-4 Heavy has the higher intelligence index (89.3 vs 84.5)
| Grok-4 Heavy | o3 Pro | |
|---|---|---|
| Intelligence index | 89.3 | 84.5 |
| Developer | xAI | OpenAI |
| Type | Multimodal | Multimodal |
| Access | API only | API only |
| Context window | — | 200,000 tokens |
| Input price | — | $20.00 / 1M |
| Output price | — | $80.00 / 1M |
| Speed | — | 25 tok/s |
| Released | July 9, 2025 | June 10, 2025 |
| Parameters | — | — |
| Input modalities | — | Text, Image |
| Output modalities | — | Text |
Shared benchmarks
Grok-4 Heavy
o3 Pro
GPQA Diamond
88.4
84.5