# GPT-5.5 Instant vs Muse Spark

> Muse Spark is the stronger model overall, scoring 50.3 to 42.5 on the Noometry Index.

- Canonical page: https://noometry.com/compare/gpt-5-5-instant-vs-muse-spark
- Last updated: 2026-10-10
- Shared benchmarks: 23

## Summary

- They share 23 benchmarks with published results for both. GPT-5.5 Instant scores higher in 0 categories and Muse Spark in 9 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in math, where Muse Spark leads 46.8 to 26.1.
- The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 68.1% for GPT-5.5 Instant and 88.9% for Muse Spark.

## Snapshot

| | GPT-5.5 Instant | Muse Spark |
|---|---|---|
| Provider | OpenAI | Meta |
| Noometry Index | 42.5 | 50.3 |
| Rank | 99 | 41 |
| Context | — | — |
| Input $/M | — | — |
| Output $/M | — | — |
| Weights | Proprietary | Proprietary |

## Coding

- GPT-5.5 Instant: 43.7 (#73)
- Muse Spark: 45.6 (#65)

| Benchmark | GPT-5.5 Instant | Muse Spark |
|---|---|---|
| SciCode | 48.6% | 51.5% |
| LMArena Coding | 1433 | 1482 |

## Reasoning

- GPT-5.5 Instant: 24.2 (#149)
- Muse Spark: 34.9 (#61)

| Benchmark | GPT-5.5 Instant | Muse Spark |
|---|---|---|
| CritPt | 0% | 11.3% |
| LMArena Hard Prompts | 1426 | 1475 |
| Epoch Capabilities Index | 142.48 | 152.09 |
| Chess Puzzles | 12% | — |

## Math

- GPT-5.5 Instant: 26.1 (#241)
- Muse Spark: 46.8 (#57)

| Benchmark | GPT-5.5 Instant | Muse Spark |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 68.1% | 88.9% |
| LMArena Math | 1420 | 1455 |
| FrontierMath (Tiers 1-3) | 26.3% | — |
| FrontierMath Tier 4 | 2.4% | — |
| ProofBench | — | 17% |
| FrontierMath (Feb 2025 set) | — | 39% |
| FrontierMath Tier 4 (v1) | — | 14.6% |

## Knowledge

- GPT-5.5 Instant: 48.9 (#68)
- Muse Spark: 65.7 (#12)

| Benchmark | GPT-5.5 Instant | Muse Spark |
|---|---|---|
| GPQA Diamond | 82.5% | 89.8% |
| LMArena Expert | 1409 | 1458 |
| Humanity's Last Exam | — | 40.6% |

## Multimodal

- GPT-5.5 Instant: 39.3 (#48)
- Muse Spark: 42.7 (#23)

| Benchmark | GPT-5.5 Instant | Muse Spark |
|---|---|---|
| LMArena Vision | 1250 | 1306 |
| LMArena Document | 1403 | 1444 |

## Multilingual

- GPT-5.5 Instant: 53.0 (#76)
- Muse Spark: 56.3 (#23)

| Benchmark | GPT-5.5 Instant | Muse Spark |
|---|---|---|
| LMArena Non-English | 1417 | 1464 |
| LMArena Chinese | 1457 | 1507 |
| LMArena French | 1428 | 1497 |
| LMArena German | 1410 | 1497 |
| LMArena Korean | 1393 | 1457 |
| LMArena Russian | 1430 | 1467 |
| LMArena Spanish | 1430 | 1471 |
| LMArena Japanese | 1408 | — |

## Instruction Following

- GPT-5.5 Instant: 74.4 (#94)
- Muse Spark: 76.1 (#47)

| Benchmark | GPT-5.5 Instant | Muse Spark |
|---|---|---|
| LMArena Instruction Following | 1407 | 1443 |

## Long Context

- GPT-5.5 Instant: 43.4 (#92)
- Muse Spark: 44.4 (#65)

| Benchmark | GPT-5.5 Instant | Muse Spark |
|---|---|---|
| LMArena Longer Query | 1422 | 1451 |

## Writing & Preference

- GPT-5.5 Instant: 62.0 (#81)
- Muse Spark: 66.2 (#37)

| Benchmark | GPT-5.5 Instant | Muse Spark |
|---|---|---|
| LMArena Text | 1419 | 1474 |
| LMArena Creative Writing | 1420 | 1460 |
| LMArena Multi-Turn | 1434 | 1477 |

## FAQ

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

Muse Spark is the stronger model overall, scoring 50.3 to 42.5 on the Noometry Index.

### Is GPT-5.5 Instant or Muse Spark better for coding?

Muse Spark scores higher on coding benchmarks: 45.6 versus 43.7 in the Noometry coding category.

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

23 benchmarks have published results for both models. GPT-5.5 Instant has 27 scored results on Noometry and Muse Spark has 27.