Grok-4 Heavy vs Muse Spark
xAI vs Meta — benchmarks, pricing, and capabilities side by side.
- •Grok-4 Heavy has the higher intelligence index (89.3 vs 88.4)
| Grok-4 Heavy | Muse Spark | |
|---|---|---|
| Intelligence index | 89.3 | 88.4 |
| Developer | xAI | Meta |
| Type | Multimodal | Multimodal |
| Access | API only | API only |
| Context window | — | — |
| Input price | — | $0.00 / 1M |
| Output price | — | $0.00 / 1M |
| Speed | — | — |
| Released | July 9, 2025 | April 8, 2026 |
| Parameters | — | — |
| Input modalities | — | Text, Image |
| Output modalities | — | Text |
Shared benchmarks
Grok-4 Heavy
Muse Spark
GPQA Diamond
88.4
88.4
Humanity’s Last Exam
50.7
39.9