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Grok 4 Fast vs Muse Spark
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| Attribute | Grok 4 Fast | Muse Spark |
|---|---|---|
| Scores | ||
| Intelligence (ECI) | 144 | 153 |
| Coding | 41 | 76 |
| Math | 49 | 64 |
| Reasoning & Knowledge | 33 | 82 |
| Agentic & Tools | 23 | 63 |
| Specifications | ||
| Developer | xAI | Meta AI |
| Family | Grok | — |
| Released | Sep 19, 2025 | Apr 8, 2026 |
| Parameters | — | — |
| Availability | API access | API access |
| Context window | — | — |
| Price — $/M input | — | — |
| Price — $/M output | — | — |
| Inputs | — | — |
| Outputs | — | — |
| Benchmarks | ||
| AIME 2024/2025 | 90% | 89% |
| ARC-AGI | 49% | — |
| ARC-AGI-2 | 5% | — |
| GPQA Diamond | 85% | 90% |
| Humanity's Last Exam | 17% | 41% |
| LiveCodeBench | 83% | — |
| MMLU-Pro | 85% | — |
| SciCode | 44% | 52% |
| WebDev Arena | 1149 | 1513 |
| WeirdML | 43% | — |
| τ²-bench | 66% | 92% |
| FrontierMath | — | 39% |
| FrontierMath Tier 4 | — | 15% |
| SimpleQA Verified | — | 66% |
Use-case scores are 0–100 percentile composites across each area’s benchmarks, ranked against every model from the past year. Highlighted cells lead each row. Open a model for the full picture.
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Benchmarks & model data from Epoch AI (CC BY); pricing & specs from OpenRouter. ECI = Epoch Capabilities Index.