Model comparison
GPT-6 Luna vs Muse Glimmer
GPT-6 Luna is the stronger model overall, scoring 45.1 to 41.3 on the Noometry Index.
Last verified . 13 shared benchmarks.
MetaSummary
- They share 13 benchmarks with published results for both. GPT-6 Luna scores higher in 7 categories and Muse Glimmer in 1 category; 5 gaps are clear of the uncertainty.
- The widest gap is in coding, where GPT-6 Luna leads 54.7 to 38.7.
- Muse Glimmer has downloadable open weights; the other is API-only.
Side by side
| GPT-6 Luna | Muse Glimmer | |
|---|---|---|
| Provider | OpenAI | Meta |
| Noometry Index | 45.1 | 41.3 |
| Released | 2026-09-22 | — |
| Weights | Proprietary | Open |
| Context window | 1.05M | — |
| Max output | 128K | — |
| Input $ / M tokens | $0.10 | — |
| Output $ / M tokens | $0.50 | — |
| Results tracked | 18 | 13 |
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Category by category
Coding GPT-6 Luna leads
GPT-6 Luna: 54.7 (#24), Muse Glimmer: 38.7 (#157)
| Benchmark | GPT-6 Luna | Muse Glimmer |
|---|---|---|
| LMArena WebDev | 1583 | 1355 |
| LMArena Coding | 1448 | 1417 |
| DeepSWE | 66.6% | — |
| FrontierCode | 42.4% | — |
Reasoning GPT-6 Luna leads
GPT-6 Luna: 31.7 (#68), Muse Glimmer: 27.2 (#111)
| Benchmark | GPT-6 Luna | Muse Glimmer |
|---|---|---|
| LMArena Hard Prompts | 1415 | 1395 |
| NYT Connections (extended) | 68.7% | — |
Math Too close to call
GPT-6 Luna: 35.6 (#140), Muse Glimmer: 36.1 (#128)
| Benchmark | GPT-6 Luna | Muse Glimmer |
|---|---|---|
| LMArena Math | 1396 | 1419 |
Knowledge GPT-6 Luna leads
GPT-6 Luna: 40.1 (#110), Muse Glimmer: 37.9 (#140)
| Benchmark | GPT-6 Luna | Muse Glimmer |
|---|---|---|
| LMArena Expert | 1458 | 1388 |
Multimodal Not comparable
GPT-6 Luna: 42.0 (#27), Muse Glimmer: —
| Benchmark | GPT-6 Luna | Muse Glimmer |
|---|---|---|
| Furniture Assembly | 44.2% | — |
Multilingual Too close to call
GPT-6 Luna: 51.0 (#111), Muse Glimmer: 50.6 (#117)
| Benchmark | GPT-6 Luna | Muse Glimmer |
|---|---|---|
| LMArena Non-English | 1390 | 1384 |
| LMArena Chinese | 1425 | 1412 |
| LMArena Russian | 1392 | 1393 |
| LMArena Spanish | 1416 | — |
Instruction Following GPT-6 Luna leads
GPT-6 Luna: 74.7 (#85), Muse Glimmer: 72.7 (#134)
| Benchmark | GPT-6 Luna | Muse Glimmer |
|---|---|---|
| LMArena Instruction Following | 1414 | 1374 |
Long Context GPT-6 Luna leads
GPT-6 Luna: 43.3 (#95), Muse Glimmer: 42.1 (#124)
| Benchmark | GPT-6 Luna | Muse Glimmer |
|---|---|---|
| LMArena Longer Query | 1417 | 1381 |
Writing & Preference Too close to call
GPT-6 Luna: 58.4 (#115), Muse Glimmer: 57.7 (#122)
| Benchmark | GPT-6 Luna | Muse Glimmer |
|---|---|---|
| LMArena Text | 1392 | 1389 |
| LMArena Creative Writing | 1357 | 1338 |
| LMArena Multi-Turn | 1400 | 1398 |
Frequently asked questions
Is GPT-6 Luna better than Muse Glimmer?
GPT-6 Luna is the stronger model overall, scoring 45.1 to 41.3 on the Noometry Index.
Is GPT-6 Luna or Muse Glimmer better for coding?
GPT-6 Luna scores higher on coding benchmarks: 54.7 versus 38.7 in the Noometry coding category.
How many benchmarks do GPT-6 Luna and Muse Glimmer share?
13 benchmarks have published results for both models. GPT-6 Luna has 18 scored results on Noometry and Muse Glimmer has 13.