Model comparison
Grok 4 Fast vs Muse Spark
Muse Spark is the stronger model overall, scoring 50.6 to 39.4 on the Noometry Index.
Last verified . 17 shared benchmarks.
MetaSummary
- They share 17 benchmarks with published results for both. Grok 4 Fast scores higher in 1 category and Muse Spark in 7 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in knowledge, where Muse Spark leads 65.7 to 32.0.
Side by side
| Grok 4 Fast | Muse Spark | |
|---|---|---|
| Provider | xAI | Meta |
| Noometry Index | 39.4 | 50.6 |
| Released | 2025-09-19 | 2026-04-08 |
| Weights | Proprietary | Proprietary |
| Context window | — | — |
| Max output | — | — |
| Input $ / M tokens | — | — |
| Output $ / M tokens | — | — |
| Results tracked | 30 | 27 |
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Category by category
Coding Muse Spark leads
Grok 4 Fast: 32.5 (#271), Muse Spark: 46.2 (#69)
| Benchmark | Grok 4 Fast | Muse Spark |
|---|---|---|
| LMArena Coding | 1429 | 1481 |
| LMArena WebDev | 1159 | — |
| SciCode | — | 51.5% |
| WeirdML | 42.9% | — |
Agentic & Tool Use Not comparable
Grok 4 Fast: 29.5 (#86), Muse Spark: —
| Benchmark | Grok 4 Fast | Muse Spark |
|---|---|---|
| τ²-bench Banking | 15.7% | — |
| Cybench | 30% | — |
| LMArena Search | 1171 | — |
Reasoning Muse Spark leads
Grok 4 Fast: 22.2 (#201), Muse Spark: 35.9 (#67)
| Benchmark | Grok 4 Fast | Muse Spark |
|---|---|---|
| LMArena Hard Prompts | 1412 | 1474 |
| Epoch Capabilities Index | 144.2 | 152.04 |
| ARC-AGI-2 | 5.3% | — |
| Kagi LLM Benchmark | 66.1% | — |
| ARC-AGI-1 | 48.5% | — |
| CritPt | — | 11.3% |
| DTBench | 82.7% | — |
| ForecastBench | 60.5 | — |
Math Muse Spark leads
Grok 4 Fast: 38.9 (#123), Muse Spark: 47.8 (#66)
| Benchmark | Grok 4 Fast | Muse Spark |
|---|---|---|
| LMArena Math | 1419 | 1455 |
| OTIS Mock AIME 2024-2025 | — | 88.9% |
| ProofBench | — | 17% |
| FrontierMath (Feb 2025 set) | — | 39% |
| FrontierMath Tier 4 (v1) | — | 14.6% |
Knowledge Muse Spark leads
Grok 4 Fast: 32.0 (#214), Muse Spark: 65.7 (#13)
| Benchmark | Grok 4 Fast | Muse Spark |
|---|---|---|
| LMArena Expert | 1411 | 1457 |
| GPQA Diamond | — | 89.8% |
| Humanity's Last Exam | — | 40.6% |
| Vectara Hallucination Rate | 19.7% | — |
Multimodal Not comparable
Grok 4 Fast: —, Muse Spark: 43.4 (#24)
| Benchmark | Grok 4 Fast | Muse Spark |
|---|---|---|
| LMArena Vision | — | 1306 |
| LMArena Document | — | 1444 |
Multilingual Muse Spark leads
Grok 4 Fast: 51.3 (#111), Muse Spark: 56.1 (#24)
| Benchmark | Grok 4 Fast | Muse Spark |
|---|---|---|
| LMArena Non-English | 1396 | 1464 |
| LMArena Chinese | 1457 | 1509 |
| LMArena French | 1431 | 1497 |
| LMArena German | 1383 | 1497 |
| LMArena Korean | 1357 | 1459 |
| LMArena Russian | 1389 | 1466 |
| LMArena Spanish | 1415 | 1472 |
| LMArena Japanese | 1352 | — |
Instruction Following Muse Spark leads
Grok 4 Fast: 73.2 (#121), Muse Spark: 75.9 (#51)
| Benchmark | Grok 4 Fast | Muse Spark |
|---|---|---|
| LMArena Instruction Following | 1387 | 1442 |
Long Context Grok 4 Fast leads
Grok 4 Fast: 63.2 (#3), Muse Spark: 44.4 (#69)
| Benchmark | Grok 4 Fast | Muse Spark |
|---|---|---|
| LMArena Longer Query | 1415 | 1451 |
| Fiction.LiveBench | 94.4% | — |
Writing & Preference Muse Spark leads
Grok 4 Fast: 60.0 (#102), Muse Spark: 66.0 (#39)
| Benchmark | Grok 4 Fast | Muse Spark |
|---|---|---|
| LMArena Text | 1407 | 1474 |
| LMArena Creative Writing | 1387 | 1459 |
| LMArena Multi-Turn | 1414 | 1477 |
Frequently asked questions
Is Grok 4 Fast better than Muse Spark?
Muse Spark is the stronger model overall, scoring 50.6 to 39.4 on the Noometry Index.
Is Grok 4 Fast or Muse Spark better for coding?
Muse Spark scores higher on coding benchmarks: 46.2 versus 32.5 in the Noometry coding category.
How many benchmarks do Grok 4 Fast and Muse Spark share?
17 benchmarks have published results for both models. Grok 4 Fast has 30 scored results on Noometry and Muse Spark has 27.