Model comparison
Muse Glimmer vs Step 5 Preview
Step 5 Preview is the stronger model overall, scoring 47.9 to 41.7 on the Noometry Index.
Last verified . 15 shared benchmarks.
Meta
StepFunSummary
- They share 15 benchmarks with published results for both. Muse Glimmer scores higher in 0 categories and Step 5 Preview in 8 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Step 5 Preview leads 40.0 to 25.7.
- The biggest single-benchmark swing is CritPt: 2.6% for Muse Glimmer and 20.9% for Step 5 Preview.
- Muse Glimmer has downloadable open weights; the other is API-only.
Side by side
| Muse Glimmer | Step 5 Preview | |
|---|---|---|
| Provider | Meta | StepFun |
| Noometry Index | 41.7 | 47.9 |
| Released | 2026-08-10 | 2026-09-16 |
| Weights | Open | Proprietary |
| Context window | — | 1.02M |
| Max output | — | 66K |
| Input $ / M tokens | — | $1 |
| Output $ / M tokens | — | $2.70 |
| Results tracked | 15 | 18 |
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Category by category
Coding Step 5 Preview leads
Muse Glimmer: 40.4 (#142), Step 5 Preview: 51.8 (#36)
| Benchmark | Muse Glimmer | Step 5 Preview |
|---|---|---|
| LMArena WebDev | 1355 | 1564 |
| SciCode | 44.9% | 58.9% |
| LMArena Coding | 1416 | 1480 |
Reasoning Step 5 Preview leads
Muse Glimmer: 25.7 (#144), Step 5 Preview: 40.0 (#57)
| Benchmark | Muse Glimmer | Step 5 Preview |
|---|---|---|
| CritPt | 2.6% | 20.9% |
| LMArena Hard Prompts | 1396 | 1465 |
Math Step 5 Preview leads
Muse Glimmer: 38.8 (#125), Step 5 Preview: 46.1 (#72)
| Benchmark | Muse Glimmer | Step 5 Preview |
|---|---|---|
| LMArena Math | 1417 | 1470 |
| ProofBench | — | 42% |
Knowledge Step 5 Preview leads
Muse Glimmer: 38.5 (#143), Step 5 Preview: 41.2 (#112)
| Benchmark | Muse Glimmer | Step 5 Preview |
|---|---|---|
| LMArena Expert | 1386 | 1470 |
Multimodal Not comparable
Muse Glimmer: —, Step 5 Preview: 41.0 (#41)
| Benchmark | Muse Glimmer | Step 5 Preview |
|---|---|---|
| LMArena Vision | — | 1267 |
Multilingual Step 5 Preview leads
Muse Glimmer: 50.5 (#122), Step 5 Preview: 53.8 (#54)
| Benchmark | Muse Glimmer | Step 5 Preview |
|---|---|---|
| LMArena Non-English | 1384 | 1432 |
| LMArena Chinese | 1412 | 1519 |
| LMArena Russian | 1390 | 1436 |
| LMArena Spanish | — | 1439 |
Instruction Following Step 5 Preview leads
Muse Glimmer: 72.6 (#135), Step 5 Preview: 76.0 (#50)
| Benchmark | Muse Glimmer | Step 5 Preview |
|---|---|---|
| LMArena Instruction Following | 1375 | 1444 |
Long Context Step 5 Preview leads
Muse Glimmer: 42.1 (#129), Step 5 Preview: 44.5 (#64)
| Benchmark | Muse Glimmer | Step 5 Preview |
|---|---|---|
| LMArena Longer Query | 1382 | 1455 |
Writing & Preference Step 5 Preview leads
Muse Glimmer: 57.5 (#126), Step 5 Preview: 62.8 (#71)
| Benchmark | Muse Glimmer | Step 5 Preview |
|---|---|---|
| LMArena Text | 1389 | 1442 |
| LMArena Creative Writing | 1339 | 1410 |
| LMArena Multi-Turn | 1399 | 1447 |
Frequently asked questions
Is Muse Glimmer better than Step 5 Preview?
Step 5 Preview is the stronger model overall, scoring 47.9 to 41.7 on the Noometry Index.
Is Muse Glimmer or Step 5 Preview better for coding?
Step 5 Preview scores higher on coding benchmarks: 51.8 versus 40.4 in the Noometry coding category.
How many benchmarks do Muse Glimmer and Step 5 Preview share?
15 benchmarks have published results for both models. Muse Glimmer has 15 scored results on Noometry and Step 5 Preview has 18.