# Grok 4.1 Fast vs Muse Spark

> Muse Spark is the stronger model overall, scoring 50.3 to 40.9 on the Noometry Index.

- Canonical page: https://noometry.com/compare/grok-4-1-fast-vs-muse-spark
- Last updated: 2026-10-10
- Shared benchmarks: 18

## Summary

- They share 18 benchmarks with published results for both. Grok 4.1 Fast scores higher in 1 category and Muse Spark in 8 categories; 9 gaps are clear of the uncertainty.
- The widest gap is in knowledge, where Muse Spark leads 65.7 to 32.6.
- The biggest single-benchmark swing is ProofBench: 4% for Grok 4.1 Fast and 17% for Muse Spark.

## Snapshot

| | Grok 4.1 Fast | Muse Spark |
|---|---|---|
| Provider | xAI | Meta |
| Noometry Index | 40.9 | 50.3 |
| Rank | 131 | 41 |
| Context | 128K | — |
| Input $/M | $0.20 | — |
| Output $/M | $0.50 | — |
| Weights | Proprietary | Proprietary |

## Coding

- Grok 4.1 Fast: 33.8 (#236)
- Muse Spark: 45.6 (#65)

| Benchmark | Grok 4.1 Fast | Muse Spark |
|---|---|---|
| LMArena Coding | 1411 | 1482 |
| LMArena WebDev | 1241 | — |
| SciCode | — | 51.5% |
| ALE-Bench | 394.93 | — |

## Agentic & Tool Use

- Grok 4.1 Fast: 36.1 (#35)
- Muse Spark: —

| Benchmark | Grok 4.1 Fast | Muse Spark |
|---|---|---|
| Berkeley Function Calling Leaderboard | 69.6% | — |
| τ²-bench Banking | 13.1% | — |
| LMArena Search | 1171 | — |
| Vending-Bench 2 | 1,107 | — |

## Reasoning

- Grok 4.1 Fast: 42.3 (#45)
- Muse Spark: 34.9 (#61)

| Benchmark | Grok 4.1 Fast | Muse Spark |
|---|---|---|
| LMArena Hard Prompts | 1407 | 1475 |
| SimpleBench | 56% | — |
| NYT Connections (extended) | 87.4% | — |
| CritPt | — | 11.3% |
| DTBench | 87.7% | — |
| Epoch Capabilities Index | — | 152.09 |
| ForecastBench | 61 | — |

## Math

- Grok 4.1 Fast: 30.9 (#201)
- Muse Spark: 46.8 (#57)

| Benchmark | Grok 4.1 Fast | Muse Spark |
|---|---|---|
| ProofBench | 4% | 17% |
| LMArena Math | 1408 | 1455 |
| MathArena Final-Answer Competitions | 60.9% | — |
| OTIS Mock AIME 2024-2025 | — | 88.9% |
| FrontierMath (Feb 2025 set) | — | 39% |
| FrontierMath Tier 4 (v1) | — | 14.6% |

## Knowledge

- Grok 4.1 Fast: 32.6 (#203)
- Muse Spark: 65.7 (#12)

| Benchmark | Grok 4.1 Fast | Muse Spark |
|---|---|---|
| LMArena Expert | 1398 | 1458 |
| GPQA Diamond | — | 89.8% |
| Humanity's Last Exam | — | 40.6% |
| Vectara Hallucination Rate | 17.8% | — |

## Multimodal

- Grok 4.1 Fast: 36.3 (#71)
- Muse Spark: 42.7 (#23)

| Benchmark | Grok 4.1 Fast | Muse Spark |
|---|---|---|
| LMArena Vision | 1201 | 1306 |
| LMArena Document | — | 1444 |

## Multilingual

- Grok 4.1 Fast: 51.1 (#110)
- Muse Spark: 56.3 (#23)

| Benchmark | Grok 4.1 Fast | Muse Spark |
|---|---|---|
| LMArena Non-English | 1391 | 1464 |
| LMArena Chinese | 1441 | 1507 |
| LMArena French | 1416 | 1497 |
| LMArena German | 1404 | 1497 |
| LMArena Korean | 1361 | 1457 |
| LMArena Russian | 1387 | 1467 |
| LMArena Spanish | 1411 | 1471 |
| LMArena Japanese | 1347 | — |

## Instruction Following

- Grok 4.1 Fast: 72.8 (#127)
- Muse Spark: 76.1 (#47)

| Benchmark | Grok 4.1 Fast | Muse Spark |
|---|---|---|
| LMArena Instruction Following | 1376 | 1443 |

## Long Context

- Grok 4.1 Fast: 42.4 (#121)
- Muse Spark: 44.4 (#65)

| Benchmark | Grok 4.1 Fast | Muse Spark |
|---|---|---|
| LMArena Longer Query | 1390 | 1451 |

## Writing & Preference

- Grok 4.1 Fast: 57.4 (#126)
- Muse Spark: 66.2 (#37)

| Benchmark | Grok 4.1 Fast | Muse Spark |
|---|---|---|
| LMArena Text | 1408 | 1474 |
| LMArena Creative Writing | 1394 | 1460 |
| LMArena Multi-Turn | 1389 | 1477 |
| EQ-Bench Creative Writing | 1327 | — |

## FAQ

### Is Grok 4.1 Fast better than Muse Spark?

Muse Spark is the stronger model overall, scoring 50.3 to 40.9 on the Noometry Index.

### Is Grok 4.1 Fast or Muse Spark better for coding?

Muse Spark scores higher on coding benchmarks: 45.6 versus 33.8 in the Noometry coding category.

### How many benchmarks do Grok 4.1 Fast and Muse Spark share?

18 benchmarks have published results for both models. Grok 4.1 Fast has 32 scored results on Noometry and Muse Spark has 27.