Grok-4 Heavy vs OpenAI GPT
xAI vs OpenAI — benchmarks, pricing, and capabilities side by side.
| Grok-4 Heavy | OpenAI GPT | |
|---|---|---|
| Intelligence index | 89.3 | — |
| Developer | xAI | OpenAI |
| Type | Multimodal | Multimodal |
| Access | API only | API only |
| Context window | — | 1,050,000 tokens |
| Input price | — | $5.00 / 1M |
| Output price | — | $30.00 / 1M |
| Speed | — | — |
| Released | July 9, 2025 | April 27, 2026 |
| Parameters | — | — |
| Input modalities | — | Image, Text |
| Output modalities | — | Text |