Grok-4 Heavy vs MiMo-V2.5
xAI vs Xiaomi — benchmarks, pricing, and capabilities side by side.
- •Grok-4 Heavy has the higher intelligence index (89.3 vs 84.9)
| Grok-4 Heavy | MiMo-V2.5 | |
|---|---|---|
| Intelligence index | 89.3 | 84.9 |
| Developer | xAI | Xiaomi |
| Type | Multimodal | Multimodal |
| Access | API only | Open weights |
| Context window | — | 1,048,576 tokens |
| Input price | — | $0.40 / 1M |
| Output price | — | $2.00 / 1M |
| Speed | — | 92 tok/s |
| Released | July 9, 2025 | April 22, 2026 |
| Parameters | — | — |
| Input modalities | — | Text, Audio, Image, Video |
| Output modalities | — | Text |
Shared benchmarks
Grok-4 Heavy
MiMo-V2.5
GPQA Diamond
88.4
84.9
Humanity’s Last Exam
50.7
25.2