Grok-4 Heavy vs Kimi K2.5
xAI vs Moonshot AI — benchmarks, pricing, and capabilities side by side.
- •Grok-4 Heavy has the higher intelligence index (89.3 vs 87.9)
| Grok-4 Heavy | Kimi K2.5 | |
|---|---|---|
| Intelligence index | 89.3 | 87.9 |
| Developer | xAI | Moonshot AI |
| Type | Multimodal | Multimodal |
| Access | API only | Open weights |
| Context window | — | 262,144 tokens |
| Input price | — | $0.40 / 1M |
| Output price | — | $1.90 / 1M |
| Speed | — | 35 tok/s |
| Released | July 9, 2025 | January 27, 2026 |
| Parameters | — | 1T (32B active) |
| Input modalities | — | Text, Image |
| Output modalities | — | Text |
Shared benchmarks
Grok-4 Heavy
Kimi K2.5
GPQA Diamond
88.4
87.9
Humanity’s Last Exam
50.7
29.4