Grok-4 Heavy vs Sonar Reasoning Pro
xAI vs Perplexity — benchmarks, pricing, and capabilities side by side.
- •Sonar Reasoning Pro has the higher intelligence index (95.7 vs 89.3)
| Grok-4 Heavy | Sonar Reasoning Pro | |
|---|---|---|
| Intelligence index | 89.3 | 95.7 |
| Developer | xAI | Perplexity |
| Type | Multimodal | Multimodal |
| Access | API only | API only |
| Context window | — | 128,000 tokens |
| Input price | — | $2.00 / 1M |
| Output price | — | $8.00 / 1M |
| Speed | — | — |
| Released | July 9, 2025 | March 7, 2025 |
| Parameters | — | — |
| Input modalities | — | Text, Image |
| Output modalities | — | Text |