Grok-4 Heavy vs Sonar
xAI vs Perplexity — benchmarks, pricing, and capabilities side by side.
- •Grok-4 Heavy has the higher intelligence index (89.3 vs 56.8)
| Grok-4 Heavy | Sonar | |
|---|---|---|
| Intelligence index | 89.3 | 56.8 |
| Developer | xAI | Perplexity |
| Type | Multimodal | Multimodal |
| Access | API only | API only |
| Context window | — | 127,072 tokens |
| Input price | — | $1.00 / 1M |
| Output price | — | $1.00 / 1M |
| Speed | — | — |
| Released | July 9, 2025 | January 27, 2025 |
| Parameters | — | — |
| Input modalities | — | Text, Image |
| Output modalities | — | Text |
Shared benchmarks
Grok-4 Heavy
Sonar
GPQA Diamond
88.4
47.1
Humanity’s Last Exam
50.7
7.3
LiveCodeBench
79.4
29.5