Model comparison
GPT-5.5 Pro vs Muse Spark
GPT-5.5 Pro is the stronger model overall, scoring 64.3 to 50.6 on the Noometry Index.
Last verified . 6 shared benchmarks.
MetaSummary
- 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 73.3 to 35.9.
- The biggest single-benchmark swing is CritPt: 30.6% for GPT-5.5 Pro and 11.3% for Muse Spark.
Side by side
| GPT-5.5 Pro | Muse Spark | |
|---|---|---|
| Provider | OpenAI | Meta |
| Noometry Index | 64.3 | 50.6 |
| Released | 2026-04-23 | 2026-04-08 |
| Weights | Proprietary | Proprietary |
| Context window | 1.05M | — |
| Max output | 128K | — |
| Input $ / M tokens | $30 | — |
| Output $ / M tokens | $180 | — |
| Results tracked | 14 | 27 |
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Category by category
Coding Not comparable
GPT-5.5 Pro: —, Muse Spark: 46.2 (#69)
| Benchmark | GPT-5.5 Pro | Muse Spark |
|---|---|---|
| SciCode | — | 51.5% |
| LMArena Coding | — | 1481 |
Reasoning GPT-5.5 Pro leads
GPT-5.5 Pro: 73.3 (#10), Muse Spark: 35.9 (#67)
| Benchmark | GPT-5.5 Pro | Muse Spark |
|---|---|---|
| CritPt | 30.6% | 11.3% |
| Epoch Capabilities Index | 162.07 | 152.04 |
| ARC-AGI-2 | 84.6% | — |
| SimpleBench | 76.9% | — |
| ARC-AGI-1 | 96.5% | — |
| Chess Puzzles | 64% | — |
| LMArena Hard Prompts | — | 1474 |
| DTBench | 96% | — |
| LMCA | 53.9% | — |
Math GPT-5.5 Pro leads
GPT-5.5 Pro: 84.0 (#10), Muse Spark: 47.8 (#66)
| 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 Muse Spark leads
GPT-5.5 Pro: 64.1 (#19), Muse Spark: 65.7 (#13)
| Benchmark | GPT-5.5 Pro | Muse Spark |
|---|---|---|
| GPQA Diamond | 93.9% | 89.8% |
| Humanity's Last Exam | — | 40.6% |
| LMArena Expert | — | 1457 |
Multimodal Not comparable
GPT-5.5 Pro: —, Muse Spark: 43.4 (#24)
| Benchmark | GPT-5.5 Pro | Muse Spark |
|---|---|---|
| LMArena Vision | — | 1306 |
| LMArena Document | — | 1444 |
Multilingual Not comparable
GPT-5.5 Pro: —, Muse Spark: 56.1 (#24)
| Benchmark | GPT-5.5 Pro | Muse Spark |
|---|---|---|
| LMArena Non-English | — | 1464 |
| LMArena Chinese | — | 1509 |
| LMArena French | — | 1497 |
| LMArena German | — | 1497 |
| LMArena Korean | — | 1459 |
| LMArena Russian | — | 1466 |
| LMArena Spanish | — | 1472 |
Instruction Following Not comparable
GPT-5.5 Pro: —, Muse Spark: 75.9 (#51)
| Benchmark | GPT-5.5 Pro | Muse Spark |
|---|---|---|
| LMArena Instruction Following | — | 1442 |
Long Context Not comparable
GPT-5.5 Pro: —, Muse Spark: 44.4 (#69)
| Benchmark | GPT-5.5 Pro | Muse Spark |
|---|---|---|
| LMArena Longer Query | — | 1451 |
Writing & Preference Not comparable
GPT-5.5 Pro: —, Muse Spark: 66.0 (#39)
| Benchmark | GPT-5.5 Pro | Muse Spark |
|---|---|---|
| LMArena Text | — | 1474 |
| LMArena Creative Writing | — | 1459 |
| LMArena Multi-Turn | — | 1477 |
Frequently asked questions
Is GPT-5.5 Pro better than Muse Spark?
GPT-5.5 Pro is the stronger model overall, scoring 64.3 to 50.6 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.