Model comparison
GPT-5.5 Instant vs Muse Spark
Muse Spark is the stronger model overall, scoring 50.6 to 42.7 on the Noometry Index.
Last verified . 23 shared benchmarks.
MetaSummary
- 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 47.8 to 26.5.
- The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 68.1% for GPT-5.5 Instant and 88.9% for Muse Spark.
Side by side
| GPT-5.5 Instant | Muse Spark | |
|---|---|---|
| Provider | OpenAI | Meta |
| Noometry Index | 42.7 | 50.6 |
| Released | 2026-05-05 | 2026-04-08 |
| Weights | Proprietary | Proprietary |
| Context window | — | — |
| Max output | — | — |
| Input $ / M tokens | — | — |
| Output $ / M tokens | — | — |
| Results tracked | 27 | 27 |
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Category by category
Coding Muse Spark leads
GPT-5.5 Instant: 44.3 (#74), Muse Spark: 46.2 (#69)
| Benchmark | GPT-5.5 Instant | Muse Spark |
|---|---|---|
| SciCode | 48.6% | 51.5% |
| LMArena Coding | 1433 | 1481 |
Reasoning Muse Spark leads
GPT-5.5 Instant: 24.9 (#155), Muse Spark: 35.9 (#67)
| Benchmark | GPT-5.5 Instant | Muse Spark |
|---|---|---|
| CritPt | 0% | 11.3% |
| LMArena Hard Prompts | 1426 | 1474 |
| Epoch Capabilities Index | 142.52 | 152.04 |
| Chess Puzzles | 12% | — |
Math Muse Spark leads
GPT-5.5 Instant: 26.5 (#259), Muse Spark: 47.8 (#66)
| 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 Muse Spark leads
GPT-5.5 Instant: 48.9 (#74), Muse Spark: 65.7 (#13)
| Benchmark | GPT-5.5 Instant | Muse Spark |
|---|---|---|
| GPQA Diamond | 82.5% | 89.8% |
| LMArena Expert | 1409 | 1457 |
| Humanity's Last Exam | — | 40.6% |
Multimodal Muse Spark leads
GPT-5.5 Instant: 40.0 (#52), Muse Spark: 43.4 (#24)
| Benchmark | GPT-5.5 Instant | Muse Spark |
|---|---|---|
| LMArena Vision | 1250 | 1306 |
| LMArena Document | 1403 | 1444 |
Multilingual Muse Spark leads
GPT-5.5 Instant: 52.8 (#80), Muse Spark: 56.1 (#24)
| Benchmark | GPT-5.5 Instant | Muse Spark |
|---|---|---|
| LMArena Non-English | 1417 | 1464 |
| LMArena Chinese | 1456 | 1509 |
| LMArena French | 1428 | 1497 |
| LMArena German | 1411 | 1497 |
| LMArena Korean | 1392 | 1459 |
| LMArena Russian | 1431 | 1466 |
| LMArena Spanish | 1429 | 1472 |
| LMArena Japanese | 1408 | — |
Instruction Following Muse Spark leads
GPT-5.5 Instant: 74.2 (#100), Muse Spark: 75.9 (#51)
| Benchmark | GPT-5.5 Instant | Muse Spark |
|---|---|---|
| LMArena Instruction Following | 1406 | 1442 |
Long Context Too close to call
GPT-5.5 Instant: 43.4 (#96), Muse Spark: 44.4 (#69)
| Benchmark | GPT-5.5 Instant | Muse Spark |
|---|---|---|
| LMArena Longer Query | 1422 | 1451 |
Writing & Preference Muse Spark leads
GPT-5.5 Instant: 61.8 (#85), Muse Spark: 66.0 (#39)
| Benchmark | GPT-5.5 Instant | Muse Spark |
|---|---|---|
| LMArena Text | 1419 | 1474 |
| LMArena Creative Writing | 1419 | 1459 |
| LMArena Multi-Turn | 1433 | 1477 |
Frequently asked questions
Is GPT-5.5 Instant better than Muse Spark?
Muse Spark is the stronger model overall, scoring 50.6 to 42.7 on the Noometry Index.
Is GPT-5.5 Instant or Muse Spark better for coding?
Muse Spark scores higher on coding benchmarks: 46.2 versus 44.3 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.