GPT-4.5 vs Grok-4 Heavy
OpenAI vs xAI — benchmarks, pricing, and capabilities side by side.
- •Grok-4 Heavy has the higher intelligence index (89.3 vs 59.4)
| GPT-4.5 | Grok-4 Heavy | |
|---|---|---|
| Intelligence index | 59.4 | 89.3 |
| Developer | OpenAI | xAI |
| Type | Multimodal | Multimodal |
| Access | API only | API only |
| Context window | 128,000 tokens | — |
| Input price | $75.00 / 1M | — |
| Output price | $150.00 / 1M | — |
| Speed | 50 tok/s | — |
| Released | February 27, 2025 | July 9, 2025 |
| Parameters | — | — |
| Input modalities | Text, Image | — |
| Output modalities | Text | — |
Shared benchmarks
GPT-4.5
Grok-4 Heavy
GPQA Diamond
71.4
88.4