Model comparison
gpt-oss-20b vs Muse Glimmer
Muse Glimmer is the stronger model overall, scoring 41.7 to 32.5 on the Noometry Index.
Last verified . 14 shared benchmarks.
MetaSummary
- They share 14 benchmarks with published results for both. gpt-oss-20b scores higher in 1 category and Muse Glimmer in 7 categories; 7 gaps are clear of the uncertainty.
- The widest gap is in writing & preference, where Muse Glimmer leads 57.5 to 35.5.
- The biggest single-benchmark swing is SciCode: 34.4% for gpt-oss-20b and 44.9% for Muse Glimmer.
Side by side
| gpt-oss-20b | Muse Glimmer | |
|---|---|---|
| Provider | OpenAI | Meta |
| Noometry Index | 32.5 | 41.7 |
| Released | 2025-08-05 | 2026-08-10 |
| Weights | Open | Open |
| Context window | 131K | — |
| Max output | 16K | — |
| Input $ / M tokens | $0.018 | — |
| Output $ / M tokens | $0.09 | — |
| Results tracked | 34 | 15 |
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Category by category
Coding Muse Glimmer leads
gpt-oss-20b: 37.6 (#192), Muse Glimmer: 40.4 (#142)
| Benchmark | gpt-oss-20b | Muse Glimmer |
|---|---|---|
| SciCode | 34.4% | 44.9% |
| LMArena Coding | 1306 | 1416 |
| LMArena WebDev | — | 1355 |
| WeirdML | 40.9% | — |
| ALE-Bench | 566.05 | — |
Agentic & Tool Use Not comparable
gpt-oss-20b: 9.3 (#154), Muse Glimmer: —
| Benchmark | gpt-oss-20b | Muse Glimmer |
|---|---|---|
| Terminal-Bench | 3.4% | — |
Reasoning Muse Glimmer leads
gpt-oss-20b: 19.3 (#261), Muse Glimmer: 25.7 (#144)
| Benchmark | gpt-oss-20b | Muse Glimmer |
|---|---|---|
| CritPt | 1.4% | 2.6% |
| LMArena Hard Prompts | 1274 | 1396 |
| Kagi LLM Benchmark | 53.2% | — |
| Chess Puzzles | 4% | — |
| DTBench | 68% | — |
| LMCA | 14.5% | — |
| Epoch Capabilities Index | 137.82 | — |
Math Too close to call
gpt-oss-20b: 39.4 (#103), Muse Glimmer: 38.8 (#125)
| Benchmark | gpt-oss-20b | Muse Glimmer |
|---|---|---|
| LMArena Math | 1317 | 1417 |
| OTIS Mock AIME 2024-2025 | 65.3% | — |
| Omni-MATH | 56.5% | — |
Knowledge Muse Glimmer leads
gpt-oss-20b: 34.6 (#195), Muse Glimmer: 38.5 (#143)
| Benchmark | gpt-oss-20b | Muse Glimmer |
|---|---|---|
| LMArena Expert | 1258 | 1386 |
| GPQA Diamond | 60.8% | — |
| MMLU-Pro | 74% | — |
| GPQA (HELM) | 59.4% | — |
Multilingual Muse Glimmer leads
gpt-oss-20b: 42.2 (#197), Muse Glimmer: 50.5 (#122)
| Benchmark | gpt-oss-20b | Muse Glimmer |
|---|---|---|
| LMArena Non-English | 1268 | 1384 |
| LMArena Chinese | 1314 | 1412 |
| LMArena Russian | 1278 | 1390 |
| LMArena German | 1255 | — |
| LMArena Japanese | 1244 | — |
| LMArena Korean | 1236 | — |
| LMArena Spanish | 1267 | — |
Instruction Following Muse Glimmer leads
gpt-oss-20b: 61.8 (#240), Muse Glimmer: 72.6 (#135)
| Benchmark | gpt-oss-20b | Muse Glimmer |
|---|---|---|
| LMArena Instruction Following | 1236 | 1375 |
| IFEval | 73.2% | — |
Long Context Muse Glimmer leads
gpt-oss-20b: 37.9 (#209), Muse Glimmer: 42.1 (#129)
| Benchmark | gpt-oss-20b | Muse Glimmer |
|---|---|---|
| LMArena Longer Query | 1250 | 1382 |
Writing & Preference Muse Glimmer leads
gpt-oss-20b: 35.5 (#265), Muse Glimmer: 57.5 (#126)
| Benchmark | gpt-oss-20b | Muse Glimmer |
|---|---|---|
| LMArena Text | 1287 | 1389 |
| LMArena Creative Writing | 1201 | 1339 |
| LMArena Multi-Turn | 1268 | 1399 |
| EQ-Bench Creative Writing | 666 | — |
| WildBench | 73.7% | — |
Frequently asked questions
Is gpt-oss-20b better than Muse Glimmer?
Muse Glimmer is the stronger model overall, scoring 41.7 to 32.5 on the Noometry Index.
Is gpt-oss-20b or Muse Glimmer better for coding?
Muse Glimmer scores higher on coding benchmarks: 40.4 versus 37.6 in the Noometry coding category.
How many benchmarks do gpt-oss-20b and Muse Glimmer share?
14 benchmarks have published results for both models. gpt-oss-20b has 34 scored results on Noometry and Muse Glimmer has 15.