Grok-4 Heavy vs Qwen3.5-27B
xAI vs Alibaba — benchmarks, pricing, and capabilities side by side.
- •Grok-4 Heavy has the higher intelligence index (89.3 vs 85.8)
| Grok-4 Heavy | Qwen3.5-27B | |
|---|---|---|
| Intelligence index | 89.3 | 85.8 |
| Developer | xAI | Alibaba |
| Type | Multimodal | Multimodal |
| Access | API only | Open weights |
| Context window | — | 262,144 tokens |
| Input price | — | $0.20 / 1M |
| Output price | — | $1.56 / 1M |
| Speed | — | 91 tok/s |
| Released | July 9, 2025 | February 25, 2026 |
| Parameters | — | — |
| Input modalities | — | Text, Image, Video |
| Output modalities | — | Text |
Shared benchmarks
Grok-4 Heavy
Qwen3.5-27B
GPQA Diamond
88.4
85.8
Humanity’s Last Exam
50.7
22.2