# GPT-5.5 Pro vs Muse Spark

> GPT-5.5 Pro is the stronger model overall, scoring 64.3 to 50.3 on the Noometry Index.

- Canonical page: https://noometry.com/compare/gpt-5-5-pro-vs-muse-spark
- Last updated: 2026-10-10
- Shared benchmarks: 6

## Summary

- They share 6 benchmarks with published results for both. GPT-5.5 Pro scores higher in 2 categories and Muse Spark in 1 category; 3 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where GPT-5.5 Pro leads 73.6 to 34.9.
- The biggest single-benchmark swing is CritPt: 30.6% for GPT-5.5 Pro and 11.3% for Muse Spark.

## Snapshot

| | GPT-5.5 Pro | Muse Spark |
|---|---|---|
| Provider | OpenAI | Meta |
| Noometry Index | 64.3 | 50.3 |
| Rank | 7 | 41 |
| Context | 1.05M | — |
| Input $/M | $30 | — |
| Output $/M | $180 | — |
| Weights | Proprietary | Proprietary |

## Coding

- GPT-5.5 Pro: —
- Muse Spark: 45.6 (#65)

| Benchmark | GPT-5.5 Pro | Muse Spark |
|---|---|---|
| SciCode | — | 51.5% |
| LMArena Coding | — | 1482 |

## Reasoning

- GPT-5.5 Pro: 73.6 (#7)
- Muse Spark: 34.9 (#61)

| Benchmark | GPT-5.5 Pro | Muse Spark |
|---|---|---|
| CritPt | 30.6% | 11.3% |
| Epoch Capabilities Index | 162.45 | 152.09 |
| ARC-AGI-2 | 84.6% | — |
| SimpleBench | 76.9% | — |
| ARC-AGI-1 | 96.5% | — |
| Chess Puzzles | 64% | — |
| LMArena Hard Prompts | — | 1475 |
| DTBench | 96% | — |
| LMCA | 53.9% | — |

## Math

- GPT-5.5 Pro: 83.8 (#8)
- Muse Spark: 46.8 (#57)

| Benchmark | GPT-5.5 Pro | Muse Spark |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 100% | 88.9% |
| FrontierMath (Feb 2025 set) | 52.4% | 39% |
| FrontierMath Tier 4 (v1) | 39.6% | 14.6% |
| FrontierMath (Tiers 1-3) | 87.7% | — |
| FrontierMath Tier 4 | 78% | — |
| ProofBench | — | 17% |
| LMArena Math | — | 1455 |

## Knowledge

- GPT-5.5 Pro: 64.2 (#17)
- Muse Spark: 65.7 (#12)

| Benchmark | GPT-5.5 Pro | Muse Spark |
|---|---|---|
| GPQA Diamond | 93.9% | 89.8% |
| Humanity's Last Exam | — | 40.6% |
| LMArena Expert | — | 1458 |

## Multimodal

- GPT-5.5 Pro: —
- Muse Spark: 42.7 (#23)

| Benchmark | GPT-5.5 Pro | Muse Spark |
|---|---|---|
| LMArena Vision | — | 1306 |
| LMArena Document | — | 1444 |

## Multilingual

- GPT-5.5 Pro: —
- Muse Spark: 56.3 (#23)

| Benchmark | GPT-5.5 Pro | Muse Spark |
|---|---|---|
| LMArena Non-English | — | 1464 |
| LMArena Chinese | — | 1507 |
| LMArena French | — | 1497 |
| LMArena German | — | 1497 |
| LMArena Korean | — | 1457 |
| LMArena Russian | — | 1467 |
| LMArena Spanish | — | 1471 |

## Instruction Following

- GPT-5.5 Pro: —
- Muse Spark: 76.1 (#47)

| Benchmark | GPT-5.5 Pro | Muse Spark |
|---|---|---|
| LMArena Instruction Following | — | 1443 |

## Long Context

- GPT-5.5 Pro: —
- Muse Spark: 44.4 (#65)

| Benchmark | GPT-5.5 Pro | Muse Spark |
|---|---|---|
| LMArena Longer Query | — | 1451 |

## Writing & Preference

- GPT-5.5 Pro: —
- Muse Spark: 66.2 (#37)

| Benchmark | GPT-5.5 Pro | Muse Spark |
|---|---|---|
| LMArena Text | — | 1474 |
| LMArena Creative Writing | — | 1460 |
| LMArena Multi-Turn | — | 1477 |

## FAQ

### Is GPT-5.5 Pro better than Muse Spark?

GPT-5.5 Pro is the stronger model overall, scoring 64.3 to 50.3 on the Noometry Index.

### How many benchmarks do GPT-5.5 Pro and Muse Spark share?

6 benchmarks have published results for both models. GPT-5.5 Pro has 14 scored results on Noometry and Muse Spark has 27.