Model comparison
GPT-5.5 Pro vs Muse Glimmer
GPT-5.5 Pro is the stronger model overall, scoring 64.3 to 41.3 on the Noometry Index.
Last verified . 0 shared benchmarks.
MetaSummary
- The widest gap is in math, where GPT-5.5 Pro leads 83.8 to 36.1.
- Muse Glimmer has downloadable open weights; the other is API-only.
Side by side
| GPT-5.5 Pro | Muse Glimmer | |
|---|---|---|
| Provider | OpenAI | Meta |
| Noometry Index | 64.3 | 41.3 |
| Released | 2026-04-23 | — |
| Weights | Proprietary | Open |
| Context window | 1.05M | — |
| Max output | 128K | — |
| Input $ / M tokens | $30 | — |
| Output $ / M tokens | $180 | — |
| Results tracked | 14 | 13 |
Sponsored placements are available on pages like this one. Advertise on Noometry
Category by category
Coding Not comparable
GPT-5.5 Pro: —, Muse Glimmer: 38.7 (#157)
| Benchmark | GPT-5.5 Pro | Muse Glimmer |
|---|---|---|
| LMArena WebDev | — | 1355 |
| LMArena Coding | — | 1417 |
Reasoning GPT-5.5 Pro leads
GPT-5.5 Pro: 73.6 (#7), Muse Glimmer: 27.2 (#111)
| Benchmark | GPT-5.5 Pro | Muse Glimmer |
|---|---|---|
| ARC-AGI-2 | 84.6% | — |
| SimpleBench | 76.9% | — |
| ARC-AGI-1 | 96.5% | — |
| CritPt | 30.6% | — |
| Chess Puzzles | 64% | — |
| LMArena Hard Prompts | — | 1395 |
| DTBench | 96% | — |
| LMCA | 53.9% | — |
| Epoch Capabilities Index | 162.45 | — |
Math GPT-5.5 Pro leads
GPT-5.5 Pro: 83.8 (#8), Muse Glimmer: 36.1 (#128)
| Benchmark | GPT-5.5 Pro | Muse Glimmer |
|---|---|---|
| FrontierMath (Tiers 1-3) | 87.7% | — |
| FrontierMath Tier 4 | 78% | — |
| OTIS Mock AIME 2024-2025 | 100% | — |
| LMArena Math | — | 1419 |
| FrontierMath (Feb 2025 set) | 52.4% | — |
| FrontierMath Tier 4 (v1) | 39.6% | — |
Knowledge GPT-5.5 Pro leads
GPT-5.5 Pro: 64.2 (#17), Muse Glimmer: 37.9 (#140)
| Benchmark | GPT-5.5 Pro | Muse Glimmer |
|---|---|---|
| GPQA Diamond | 93.9% | — |
| LMArena Expert | — | 1388 |
Multilingual Not comparable
GPT-5.5 Pro: —, Muse Glimmer: 50.6 (#117)
| Benchmark | GPT-5.5 Pro | Muse Glimmer |
|---|---|---|
| LMArena Non-English | — | 1384 |
| LMArena Chinese | — | 1412 |
| LMArena Russian | — | 1393 |
Instruction Following Not comparable
GPT-5.5 Pro: —, Muse Glimmer: 72.7 (#134)
| Benchmark | GPT-5.5 Pro | Muse Glimmer |
|---|---|---|
| LMArena Instruction Following | — | 1374 |
Long Context Not comparable
GPT-5.5 Pro: —, Muse Glimmer: 42.1 (#124)
| Benchmark | GPT-5.5 Pro | Muse Glimmer |
|---|---|---|
| LMArena Longer Query | — | 1381 |
Writing & Preference Not comparable
GPT-5.5 Pro: —, Muse Glimmer: 57.7 (#122)
| Benchmark | GPT-5.5 Pro | Muse Glimmer |
|---|---|---|
| LMArena Text | — | 1389 |
| LMArena Creative Writing | — | 1338 |
| LMArena Multi-Turn | — | 1398 |
Frequently asked questions
Is GPT-5.5 Pro better than Muse Glimmer?
GPT-5.5 Pro is the stronger model overall, scoring 64.3 to 41.3 on the Noometry Index.
How many benchmarks do GPT-5.5 Pro and Muse Glimmer share?
0 benchmarks have published results for both models. GPT-5.5 Pro has 14 scored results on Noometry and Muse Glimmer has 13.