# GPT-5.3 Chat vs Muse Spark

> Muse Spark is the stronger model overall, scoring 50.6 to 42.8 on the Noometry Index.

- Canonical page: https://noometry.com/compare/gpt-5-3-chat-vs-muse-spark
- Last updated: 2026-10-10
- Shared benchmarks: 16

## Summary

- They share 16 benchmarks with published results for both. GPT-5.3 Chat scores higher in 0 categories and Muse Spark in 8 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in knowledge, where Muse Spark leads 65.7 to 38.8.

## Snapshot

| | GPT-5.3 Chat | Muse Spark |
|---|---|---|
| Provider | OpenAI | Meta |
| Noometry Index | 42.8 | 50.6 |
| Rank | 109 | 46 |
| Context | 128K | — |
| Input $/M | $1.75 | — |
| Output $/M | $14 | — |
| Weights | Proprietary | Proprietary |

## Coding

- GPT-5.3 Chat: 41.4 (#124)
- Muse Spark: 46.2 (#69)

| Benchmark | GPT-5.3 Chat | Muse Spark |
|---|---|---|
| LMArena Coding | 1408 | 1481 |
| SciCode | — | 51.5% |

## Reasoning

- GPT-5.3 Chat: 28.5 (#102)
- Muse Spark: 35.9 (#67)

| Benchmark | GPT-5.3 Chat | Muse Spark |
|---|---|---|
| LMArena Hard Prompts | 1399 | 1474 |
| CritPt | — | 11.3% |
| Epoch Capabilities Index | — | 152.04 |

## Math

- GPT-5.3 Chat: 38.2 (#142)
- Muse Spark: 47.8 (#66)

| Benchmark | GPT-5.3 Chat | Muse Spark |
|---|---|---|
| LMArena Math | 1389 | 1455 |
| OTIS Mock AIME 2024-2025 | — | 88.9% |
| ProofBench | — | 17% |
| FrontierMath (Feb 2025 set) | — | 39% |
| FrontierMath Tier 4 (v1) | — | 14.6% |

## Knowledge

- GPT-5.3 Chat: 38.8 (#140)
- Muse Spark: 65.7 (#13)

| Benchmark | GPT-5.3 Chat | Muse Spark |
|---|---|---|
| LMArena Expert | 1397 | 1457 |
| GPQA Diamond | — | 89.8% |
| Humanity's Last Exam | — | 40.6% |

## Multimodal

- GPT-5.3 Chat: —
- Muse Spark: 43.4 (#24)

| Benchmark | GPT-5.3 Chat | Muse Spark |
|---|---|---|
| LMArena Vision | — | 1306 |
| LMArena Document | — | 1444 |

## Multilingual

- GPT-5.3 Chat: 50.3 (#124)
- Muse Spark: 56.1 (#24)

| Benchmark | GPT-5.3 Chat | Muse Spark |
|---|---|---|
| LMArena Non-English | 1382 | 1464 |
| LMArena Chinese | 1432 | 1509 |
| LMArena French | 1397 | 1497 |
| LMArena German | 1384 | 1497 |
| LMArena Korean | 1346 | 1459 |
| LMArena Russian | 1400 | 1466 |
| LMArena Spanish | 1371 | 1472 |
| LMArena Japanese | 1352 | — |

## Instruction Following

- GPT-5.3 Chat: 72.8 (#129)
- Muse Spark: 75.9 (#51)

| Benchmark | GPT-5.3 Chat | Muse Spark |
|---|---|---|
| LMArena Instruction Following | 1378 | 1442 |

## Long Context

- GPT-5.3 Chat: 42.6 (#120)
- Muse Spark: 44.4 (#69)

| Benchmark | GPT-5.3 Chat | Muse Spark |
|---|---|---|
| LMArena Longer Query | 1396 | 1451 |

## Writing & Preference

- GPT-5.3 Chat: 63.1 (#68)
- Muse Spark: 66.0 (#39)

| Benchmark | GPT-5.3 Chat | Muse Spark |
|---|---|---|
| LMArena Text | 1389 | 1474 |
| LMArena Creative Writing | 1355 | 1459 |
| LMArena Multi-Turn | 1412 | 1477 |
| EQ-Bench Creative Writing | 1690 | — |

## FAQ

### Is GPT-5.3 Chat better than Muse Spark?

Muse Spark is the stronger model overall, scoring 50.6 to 42.8 on the Noometry Index.

### Is GPT-5.3 Chat or Muse Spark better for coding?

Muse Spark scores higher on coding benchmarks: 46.2 versus 41.4 in the Noometry coding category.

### How many benchmarks do GPT-5.3 Chat and Muse Spark share?

16 benchmarks have published results for both models. GPT-5.3 Chat has 18 scored results on Noometry and Muse Spark has 27.