Gemini 3.5 Flash vs Grok-4 Heavy
Google vs xAI — benchmarks, pricing, and capabilities side by side.
- •Gemini 3.5 Flash has the higher intelligence index (92.2 vs 89.3)
| Gemini 3.5 Flash | Grok-4 Heavy | |
|---|---|---|
| Intelligence index | 92.2 | 89.3 |
| Developer | xAI | |
| Type | Multimodal | Multimodal |
| Access | API only | API only |
| Context window | 1,048,576 tokens | — |
| Input price | $1.50 / 1M | — |
| Output price | $9.00 / 1M | — |
| Speed | 221 tok/s | — |
| Released | May 19, 2026 | July 9, 2025 |
| Parameters | — | — |
| Input modalities | Text, Image, Audio, Video | — |
| Output modalities | Text | — |
Shared benchmarks
Gemini 3.5 Flash
Grok-4 Heavy
GPQA Diamond
92.2
88.4
Humanity’s Last Exam
41
50.7