Model comparison
Muse Spark vs Step 5 Preview
Muse Spark is the stronger model overall, scoring 50.6 to 47.9 on the Noometry Index.
Last verified . 17 shared benchmarks.
Meta
StepFunSummary
- They share 17 benchmarks with published results for both. Muse Spark scores higher in 5 categories and Step 5 Preview in 4 categories; 7 gaps are clear of the uncertainty.
- The widest gap is in knowledge, where Muse Spark leads 65.7 to 41.2.
- The biggest single-benchmark swing is ProofBench: 17% for Muse Spark and 42% for Step 5 Preview.
Side by side
| Muse Spark | Step 5 Preview | |
|---|---|---|
| Provider | Meta | StepFun |
| Noometry Index | 50.6 | 47.9 |
| Released | 2026-04-08 | 2026-09-16 |
| Weights | Proprietary | Proprietary |
| Context window | — | 1.02M |
| Max output | — | 66K |
| Input $ / M tokens | — | $1 |
| Output $ / M tokens | — | $2.70 |
| Results tracked | 27 | 18 |
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Category by category
Coding Step 5 Preview leads
Muse Spark: 46.2 (#69), Step 5 Preview: 51.8 (#36)
| Benchmark | Muse Spark | Step 5 Preview |
|---|---|---|
| SciCode | 51.5% | 58.9% |
| LMArena Coding | 1481 | 1480 |
| LMArena WebDev | — | 1564 |
Reasoning Step 5 Preview leads
Muse Spark: 35.9 (#67), Step 5 Preview: 40.0 (#57)
| Benchmark | Muse Spark | Step 5 Preview |
|---|---|---|
| CritPt | 11.3% | 20.9% |
| LMArena Hard Prompts | 1474 | 1465 |
| Epoch Capabilities Index | 152.04 | — |
Math Muse Spark leads
Muse Spark: 47.8 (#66), Step 5 Preview: 46.1 (#72)
| Benchmark | Muse Spark | Step 5 Preview |
|---|---|---|
| ProofBench | 17% | 42% |
| LMArena Math | 1455 | 1470 |
| OTIS Mock AIME 2024-2025 | 88.9% | — |
| FrontierMath (Feb 2025 set) | 39% | — |
| FrontierMath Tier 4 (v1) | 14.6% | — |
Knowledge Muse Spark leads
Muse Spark: 65.7 (#13), Step 5 Preview: 41.2 (#112)
| Benchmark | Muse Spark | Step 5 Preview |
|---|---|---|
| LMArena Expert | 1457 | 1470 |
| GPQA Diamond | 89.8% | — |
| Humanity's Last Exam | 40.6% | — |
Multimodal Muse Spark leads
Muse Spark: 43.4 (#24), Step 5 Preview: 41.0 (#41)
| Benchmark | Muse Spark | Step 5 Preview |
|---|---|---|
| LMArena Vision | 1306 | 1267 |
| LMArena Document | 1444 | — |
Multilingual Muse Spark leads
Muse Spark: 56.1 (#24), Step 5 Preview: 53.8 (#54)
| Benchmark | Muse Spark | Step 5 Preview |
|---|---|---|
| LMArena Non-English | 1464 | 1432 |
| LMArena Chinese | 1509 | 1519 |
| LMArena Russian | 1466 | 1436 |
| LMArena Spanish | 1472 | 1439 |
| LMArena French | 1497 | — |
| LMArena German | 1497 | — |
| LMArena Korean | 1459 | — |
Instruction Following Too close to call
Muse Spark: 75.9 (#51), Step 5 Preview: 76.0 (#50)
| Benchmark | Muse Spark | Step 5 Preview |
|---|---|---|
| LMArena Instruction Following | 1442 | 1444 |
Long Context Too close to call
Muse Spark: 44.4 (#69), Step 5 Preview: 44.5 (#64)
| Benchmark | Muse Spark | Step 5 Preview |
|---|---|---|
| LMArena Longer Query | 1451 | 1455 |
Writing & Preference Muse Spark leads
Muse Spark: 66.0 (#39), Step 5 Preview: 62.8 (#71)
| Benchmark | Muse Spark | Step 5 Preview |
|---|---|---|
| LMArena Text | 1474 | 1442 |
| LMArena Creative Writing | 1459 | 1410 |
| LMArena Multi-Turn | 1477 | 1447 |
Frequently asked questions
Is Muse Spark better than Step 5 Preview?
Muse Spark is the stronger model overall, scoring 50.6 to 47.9 on the Noometry Index.
Is Muse Spark or Step 5 Preview better for coding?
Step 5 Preview scores higher on coding benchmarks: 51.8 versus 46.2 in the Noometry coding category.
How many benchmarks do Muse Spark and Step 5 Preview share?
17 benchmarks have published results for both models. Muse Spark has 27 scored results on Noometry and Step 5 Preview has 18.