Gemini 3.1 Pro vs Grok-4 Heavy
Google vs xAI — benchmarks, pricing, and capabilities side by side.
- •Grok-4 Heavy has the higher intelligence index (89.3 vs 83.2)
| Gemini 3.1 Pro | Grok-4 Heavy | |
|---|---|---|
| Intelligence index | 83.2 | 89.3 |
| Developer | xAI | |
| Type | Multimodal | Multimodal |
| Access | API only | API only |
| Context window | 1,048,576 tokens | — |
| Input price | $2.00 / 1M | — |
| Output price | $12.00 / 1M | — |
| Speed | 142 tok/s | — |
| Released | February 19, 2026 | July 9, 2025 |
| Parameters | — | — |
| Input modalities | Text, Image, Audio, Video | — |
| Output modalities | Text | — |
Shared benchmarks
Gemini 3.1 Pro
Grok-4 Heavy
GPQA Diamond
94.3
88.4
Humanity’s Last Exam
44.4
50.7