# Grok 4 Fast vs Muse Spark 1.3

> Muse Spark 1.3 is the stronger model overall, scoring 54.4 to 39.0 on the Noometry Index.

- Canonical page: https://noometry.com/compare/grok-4-fast-vs-muse-spark-1-3
- Last updated: 2026-10-10
- Shared benchmarks: 18

## Summary

- They share 18 benchmarks with published results for both. Grok 4 Fast scores higher in 1 category and Muse Spark 1.3 in 8 categories; 9 gaps are clear of the uncertainty.
- The widest gap is in math, where Muse Spark 1.3 leads 72.4 to 36.1.
- The biggest single-benchmark swing is DTBench: 82.7% for Grok 4 Fast and 96.5% for Muse Spark 1.3.

## Snapshot

| | Grok 4 Fast | Muse Spark 1.3 |
|---|---|---|
| Provider | xAI | Meta |
| Noometry Index | 39.0 | 54.4 |
| Rank | 164 | 27 |
| Context | — | 1.05M |
| Input $/M | — | $1.25 |
| Output $/M | — | $4.25 |
| Weights | Proprietary | Proprietary |

## Coding

- Grok 4 Fast: 32.3 (#264)
- Muse Spark 1.3: 56.1 (#18)

| Benchmark | Grok 4 Fast | Muse Spark 1.3 |
|---|---|---|
| LMArena WebDev | 1160 | 1655 |
| LMArena Coding | 1429 | 1516 |
| CursorBench | — | 41.6% |
| SciCode | — | 59.7% |
| WeirdML | 42.9% | — |

## Agentic & Tool Use

- Grok 4 Fast: 29.3 (#80)
- Muse Spark 1.3: 38.6 (#28)

| Benchmark | Grok 4 Fast | Muse Spark 1.3 |
|---|---|---|
| APEX-Agents | — | 57.8% |
| τ²-bench Banking | 15.7% | — |
| Cybench | 30% | — |
| GDP.pdf | — | 27.6% |
| LMArena Search | 1171 | — |

## Reasoning

- Grok 4 Fast: 22.5 (#179)
- Muse Spark 1.3: 52.9 (#27)

| Benchmark | Grok 4 Fast | Muse Spark 1.3 |
|---|---|---|
| LMArena Hard Prompts | 1413 | 1503 |
| DTBench | 82.7% | 96.5% |
| Epoch Capabilities Index | 144.21 | 156.89 |
| ARC-AGI-2 | 5.3% | — |
| Kagi LLM Benchmark | 66.1% | — |
| NYT Connections (extended) | — | 85.1% |
| ARC-AGI-1 | 48.5% | — |
| CritPt | — | 24.9% |
| Chess Puzzles | — | 38% |
| Mystery Game Puzzles | — | 25% |
| LMCA | — | 53.9% |
| Bench to the Future 3 | — | 0.14 |
| ForecastBench | 60.5 | — |

## Math

- Grok 4 Fast: 36.1 (#126)
- Muse Spark 1.3: 72.4 (#16)

| Benchmark | Grok 4 Fast | Muse Spark 1.3 |
|---|---|---|
| LMArena Math | 1419 | 1497 |
| FrontierMath (Tiers 1-3) | — | 74.4% |
| FrontierMath Tier 4 | — | 46.3% |
| OTIS Mock AIME 2024-2025 | — | 99.2% |

## Knowledge

- Grok 4 Fast: 31.5 (#211)
- Muse Spark 1.3: 42.0 (#92)

| Benchmark | Grok 4 Fast | Muse Spark 1.3 |
|---|---|---|
| LMArena Expert | 1411 | 1516 |
| Vectara Hallucination Rate | 19.7% | — |

## Multimodal

- Grok 4 Fast: —
- Muse Spark 1.3: 43.0 (#21)

| Benchmark | Grok 4 Fast | Muse Spark 1.3 |
|---|---|---|
| LMArena Vision | — | 1310 |
| LMArena Document | — | 1471 |

## Multilingual

- Grok 4 Fast: 51.5 (#106)
- Muse Spark 1.3: 57.8 (#6)

| Benchmark | Grok 4 Fast | Muse Spark 1.3 |
|---|---|---|
| LMArena Non-English | 1397 | 1485 |
| LMArena Chinese | 1458 | 1527 |
| LMArena French | 1433 | 1534 |
| LMArena Korean | 1359 | 1513 |
| LMArena Russian | 1387 | 1491 |
| LMArena Spanish | 1414 | 1485 |
| LMArena German | 1383 | — |
| LMArena Japanese | 1358 | — |

## Instruction Following

- Grok 4 Fast: 73.4 (#116)
- Muse Spark 1.3: 77.8 (#14)

| Benchmark | Grok 4 Fast | Muse Spark 1.3 |
|---|---|---|
| LMArena Instruction Following | 1388 | 1481 |

## Long Context

- Grok 4 Fast: 63.2 (#3)
- Muse Spark 1.3: 45.7 (#29)

| Benchmark | Grok 4 Fast | Muse Spark 1.3 |
|---|---|---|
| LMArena Longer Query | 1415 | 1491 |
| Fiction.LiveBench | 94.4% | — |

## Writing & Preference

- Grok 4 Fast: 60.2 (#96)
- Muse Spark 1.3: 73.7 (#10)

| Benchmark | Grok 4 Fast | Muse Spark 1.3 |
|---|---|---|
| LMArena Text | 1407 | 1490 |
| LMArena Creative Writing | 1388 | 1450 |
| LMArena Multi-Turn | 1414 | 1486 |
| EQ-Bench Creative Writing | — | 1906 |

## FAQ

### Is Grok 4 Fast better than Muse Spark 1.3?

Muse Spark 1.3 is the stronger model overall, scoring 54.4 to 39.0 on the Noometry Index.

### Is Grok 4 Fast or Muse Spark 1.3 better for coding?

Muse Spark 1.3 scores higher on coding benchmarks: 56.1 versus 32.3 in the Noometry coding category.

### How many benchmarks do Grok 4 Fast and Muse Spark 1.3 share?

18 benchmarks have published results for both models. Grok 4 Fast has 30 scored results on Noometry and Muse Spark 1.3 has 34.