# GPT-4.5 vs Muse Spark 1.1

> Muse Spark 1.1 is the stronger model overall, scoring 49.9 to 36.9 on the Noometry Index.

- Canonical page: https://noometry.com/compare/gpt-4-5-vs-muse-spark-1-1
- Last updated: 2026-10-10
- Shared benchmarks: 19

## Summary

- They share 19 benchmarks with published results for both. GPT-4.5 scores higher in 0 categories and Muse Spark 1.1 in 10 categories; 10 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Muse Spark 1.1 leads 45.9 to 14.1.

## Snapshot

| | GPT-4.5 | Muse Spark 1.1 |
|---|---|---|
| Provider | OpenAI | Meta |
| Noometry Index | 36.9 | 49.9 |
| Rank | 200 | 43 |
| Context | — | 1.05M |
| Input $/M | — | $1.25 |
| Output $/M | — | $4.25 |
| Weights | Proprietary | Proprietary |

## Coding

- GPT-4.5: 41.8 (#102)
- Muse Spark 1.1: 50.8 (#38)

| Benchmark | GPT-4.5 | Muse Spark 1.1 |
|---|---|---|
| LMArena Coding | 1397 | 1497 |
| DeepSWE | — | 53.3% |
| Aider Polyglot | 44.9% | — |
| LMArena WebDev | — | 1542 |
| SciCode | — | 58.8% |
| WeirdML | 39.4% | — |
| LiveBench Coding | 75.2% | — |

## Agentic & Tool Use

- GPT-4.5: 27.6 (#92)
- Muse Spark 1.1: 33.9 (#45)

| Benchmark | GPT-4.5 | Muse Spark 1.1 |
|---|---|---|
| τ²-bench Banking | — | 40.5% |
| Cybench | 17.5% | — |
| GBAEval | — | 7.9% |
| GDP.pdf | — | 15% |
| Vending-Bench 2 | — | 6,520 |

## Reasoning

- GPT-4.5: 14.1 (#320)
- Muse Spark 1.1: 45.9 (#41)

| Benchmark | GPT-4.5 | Muse Spark 1.1 |
|---|---|---|
| LMArena Hard Prompts | 1404 | 1486 |
| Epoch Capabilities Index | 136.74 | 154.32 |
| ARC-AGI-2 | 0.8% | — |
| SimpleBench | 34.5% | — |
| NYT Connections (extended) | — | 84.9% |
| ARC-AGI-1 | 10.3% | — |
| CritPt | — | 15.1% |
| EnigmaEval | 3.2% | — |
| LiveBench Reasoning | 71.1% | — |
| DTBench | — | 94.4% |
| LiveBench Data Analysis | 64.3% | — |
| LMCA | — | 49.9% |
| Surface Evolver Bench | — | 52.5% |
| ForecastBench | 61.7 | — |
| LiveBench | 69% | — |

## Math

- GPT-4.5: 31.0 (#200)
- Muse Spark 1.1: 44.0 (#67)

| Benchmark | GPT-4.5 | Muse Spark 1.1 |
|---|---|---|
| LMArena Math | 1412 | 1477 |
| OTIS Mock AIME 2024-2025 | 37.8% | — |
| ProofBench | — | 39% |
| LiveBench Math | 69.3% | — |
| MATH Level 5 | 78.6% | — |

## Knowledge

- GPT-4.5: 32.4 (#205)
- Muse Spark 1.1: 52.8 (#55)

| Benchmark | GPT-4.5 | Muse Spark 1.1 |
|---|---|---|
| LMArena Expert | 1394 | 1480 |
| GPQA Diamond | 68.7% | — |
| Humanity's Last Exam | 5.4% | — |
| SimpleQA Verified | — | 57.8% |
| Confabulations | 13.6% | — |

## Multimodal

- GPT-4.5: 37.0 (#68)
- Muse Spark 1.1: 41.9 (#28)

| Benchmark | GPT-4.5 | Muse Spark 1.1 |
|---|---|---|
| LMArena Vision | 1195 | 1292 |
| VPCT | 45% | — |
| LMArena Document | — | 1465 |

## Multilingual

- GPT-4.5: 52.7 (#78)
- Muse Spark 1.1: 56.8 (#16)

| Benchmark | GPT-4.5 | Muse Spark 1.1 |
|---|---|---|
| LMArena Non-English | 1413 | 1471 |
| LMArena Chinese | 1421 | 1518 |
| LMArena French | 1417 | 1494 |
| LMArena German | 1457 | 1466 |
| LMArena Japanese | 1416 | 1445 |
| LMArena Korean | 1392 | 1459 |
| LMArena Russian | 1419 | 1482 |
| LMArena Spanish | — | 1471 |

## Instruction Following

- GPT-4.5: 72.8 (#129)
- Muse Spark 1.1: 76.8 (#36)

| Benchmark | GPT-4.5 | Muse Spark 1.1 |
|---|---|---|
| LMArena Instruction Following | 1404 | 1457 |
| LiveBench Instruction Following | 72.3% | — |

## Long Context

- GPT-4.5: 40.4 (#150)
- Muse Spark 1.1: 44.8 (#55)

| Benchmark | GPT-4.5 | Muse Spark 1.1 |
|---|---|---|
| LMArena Longer Query | 1406 | 1463 |
| Fiction.LiveBench | 63.9% | — |

## Writing & Preference

- GPT-4.5: 57.1 (#129)
- Muse Spark 1.1: 73.6 (#11)

| Benchmark | GPT-4.5 | Muse Spark 1.1 |
|---|---|---|
| LMArena Text | 1417 | 1479 |
| LMArena Creative Writing | 1394 | 1440 |
| EQ-Bench Creative Writing | 1258 | 1927 |
| LMArena Multi-Turn | 1444 | 1484 |
| Short-Story Creative Writing | 75.6% | — |
| EQ-Bench 4 | — | 1260 |
| LiveBench Language | 61.5% | — |

## FAQ

### Is GPT-4.5 better than Muse Spark 1.1?

Muse Spark 1.1 is the stronger model overall, scoring 49.9 to 36.9 on the Noometry Index.

### Is GPT-4.5 or Muse Spark 1.1 better for coding?

Muse Spark 1.1 scores higher on coding benchmarks: 50.8 versus 41.8 in the Noometry coding category.

### How many benchmarks do GPT-4.5 and Muse Spark 1.1 share?

19 benchmarks have published results for both models. GPT-4.5 has 42 scored results on Noometry and Muse Spark 1.1 has 36.