Grok-4 Heavy vs Sonar Pro
xAI vs Perplexity — benchmarks, pricing, and capabilities side by side.
- •Grok-4 Heavy has the higher intelligence index (89.3 vs 58.8)
| Grok-4 Heavy | Sonar Pro | |
|---|---|---|
| Intelligence index | 89.3 | 58.8 |
| Developer | xAI | Perplexity |
| Type | Multimodal | Multimodal |
| Access | API only | API only |
| Context window | — | 200,000 tokens |
| Input price | — | $3.00 / 1M |
| Output price | — | $15.00 / 1M |
| Speed | — | — |
| Released | July 9, 2025 | March 7, 2025 |
| Parameters | — | — |
| Input modalities | — | Text, Image |
| Output modalities | — | Text |
Shared benchmarks
Grok-4 Heavy
Sonar Pro
GPQA Diamond
88.4
57.8
Humanity’s Last Exam
50.7
7.9
LiveCodeBench
79.4
27.5