# Grok 4.5 vs Muse Spark

> Grok 4.5 is the stronger model overall, scoring 55.0 to 50.6 on the Noometry Index.

- Canonical page: https://noometry.com/compare/grok-4-5-vs-muse-spark
- Last updated: 2026-10-11
- Shared benchmarks: 24

## Summary

- They share 24 benchmarks with published results for both. Grok 4.5 scores higher in 5 categories and Muse Spark in 4 categories; 6 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Grok 4.5 leads 56.1 to 35.9.
- The biggest single-benchmark swing is ProofBench: 31% for Grok 4.5 and 17% for Muse Spark.

## Snapshot

| | Grok 4.5 | Muse Spark |
|---|---|---|
| Provider | xAI | Meta |
| Noometry Index | 55.0 | 50.6 |
| Rank | 25 | 46 |
| Context | 500K | — |
| Input $/M | $2 | — |
| Output $/M | $6 | — |
| Weights | Proprietary | Proprietary |

## Coding

- Grok 4.5: 52.2 (#35)
- Muse Spark: 46.2 (#69)

| Benchmark | Grok 4.5 | Muse Spark |
|---|---|---|
| SciCode | 54.1% | 51.5% |
| LMArena Coding | 1474 | 1481 |
| DeepSWE | 53.8% | — |
| FrontierCode | 42.4% | — |
| LMArena WebDev | 1553 | — |
| WeirdML | 46.4% | — |
| ALE-Bench | 1,309 | — |

## Agentic & Tool Use

- Grok 4.5: 44.4 (#17)
- Muse Spark: —

| Benchmark | Grok 4.5 | Muse Spark |
|---|---|---|
| APEX-Agents | 56.2% | — |
| τ²-bench Banking | 47.9% | — |
| PostTrainBench | 23.4% | — |
| GBAEval | 65.4% | — |
| GDP.pdf | 14% | — |
| LMArena Search | 1213 | — |
| Vending-Bench 2 | 3,887 | — |

## Reasoning

- Grok 4.5: 56.1 (#25)
- Muse Spark: 35.9 (#67)

| Benchmark | Grok 4.5 | Muse Spark |
|---|---|---|
| CritPt | 15.4% | 11.3% |
| LMArena Hard Prompts | 1462 | 1474 |
| Epoch Capabilities Index | 153.92 | 152.04 |
| ARC-AGI-2 | 52.6% | — |
| SimpleBench | 70% | — |
| Kagi LLM Benchmark | 83.5% | — |
| NYT Connections (extended) | 79.9% | — |
| ARC-AGI-1 | 87.2% | — |
| Chess Puzzles | 36% | — |
| DTBench | 96.5% | — |
| LMCA | 45.2% | — |
| Surface Evolver Bench | 74.4% | — |

## Math

- Grok 4.5: 60.9 (#35)
- Muse Spark: 47.8 (#66)

| Benchmark | Grok 4.5 | Muse Spark |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 97.8% | 88.9% |
| ProofBench | 31% | 17% |
| LMArena Math | 1459 | 1455 |
| FrontierMath (Tiers 1-3) | 57.2% | — |
| FrontierMath Tier 4 | 24.4% | — |
| FrontierMath (Feb 2025 set) | — | 39% |
| FrontierMath Tier 4 (v1) | — | 14.6% |

## Knowledge

- Grok 4.5: 62.3 (#24)
- Muse Spark: 65.7 (#13)

| Benchmark | Grok 4.5 | Muse Spark |
|---|---|---|
| GPQA Diamond | 93.4% | 89.8% |
| LMArena Expert | 1466 | 1457 |
| Humanity's Last Exam | — | 40.6% |
| SimpleQA Verified | 48.3% | — |

## Multimodal

- Grok 4.5: 37.6 (#72)
- Muse Spark: 43.4 (#24)

| Benchmark | Grok 4.5 | Muse Spark |
|---|---|---|
| LMArena Vision | 1288 | 1306 |
| LMArena Document | 1452 | 1444 |
| Blueprint-Bench 2 | 27.3% | — |
| Furniture Assembly | 22.5% | — |

## Multilingual

- Grok 4.5: 54.4 (#42)
- Muse Spark: 56.1 (#24)

| Benchmark | Grok 4.5 | Muse Spark |
|---|---|---|
| LMArena Non-English | 1440 | 1464 |
| LMArena Chinese | 1496 | 1509 |
| LMArena French | 1456 | 1497 |
| LMArena German | 1446 | 1497 |
| LMArena Korean | 1404 | 1459 |
| LMArena Russian | 1448 | 1466 |
| LMArena Spanish | 1450 | 1472 |
| LMArena Japanese | 1428 | — |

## Instruction Following

- Grok 4.5: 76.0 (#48)
- Muse Spark: 75.9 (#51)

| Benchmark | Grok 4.5 | Muse Spark |
|---|---|---|
| LMArena Instruction Following | 1446 | 1442 |

## Long Context

- Grok 4.5: 44.8 (#56)
- Muse Spark: 44.4 (#69)

| Benchmark | Grok 4.5 | Muse Spark |
|---|---|---|
| LMArena Longer Query | 1463 | 1451 |

## Writing & Preference

- Grok 4.5: 65.8 (#42)
- Muse Spark: 66.0 (#39)

| Benchmark | Grok 4.5 | Muse Spark |
|---|---|---|
| LMArena Text | 1448 | 1474 |
| LMArena Creative Writing | 1442 | 1459 |
| LMArena Multi-Turn | 1456 | 1477 |
| EQ-Bench Creative Writing | 1579 | — |

## FAQ

### Is Grok 4.5 better than Muse Spark?

Grok 4.5 is the stronger model overall, scoring 55.0 to 50.6 on the Noometry Index.

### Is Grok 4.5 or Muse Spark better for coding?

Grok 4.5 scores higher on coding benchmarks: 52.2 versus 46.2 in the Noometry coding category.

### How many benchmarks do Grok 4.5 and Muse Spark share?

24 benchmarks have published results for both models. Grok 4.5 has 52 scored results on Noometry and Muse Spark has 27.