Model comparison
Muse Spark 1.2 vs Step 5 Preview
Muse Spark 1.2 is the stronger model overall, scoring 50.3 to 47.9 on the Noometry Index.
Last verified . 18 shared benchmarks.
Meta
StepFunSummary
- They share 18 benchmarks with published results for both. Muse Spark 1.2 scores higher in 8 categories and Step 5 Preview in 1 category; 6 gaps are clear of the uncertainty.
- The widest gap is in knowledge, where Muse Spark 1.2 leads 54.1 to 41.2.
- Step 5 Preview is cheaper at $1 / $2.70 per million input/output tokens, against $1.25 / $4.25 for Muse Spark 1.2.
- Muse Spark 1.2 accepts more context: 1.05M tokens versus 1.02M.
Side by side
| Muse Spark 1.2 | Step 5 Preview | |
|---|---|---|
| Provider | Meta | StepFun |
| Noometry Index | 50.3 | 47.9 |
| Released | 2026-08-05 | 2026-09-16 |
| Weights | Proprietary | Proprietary |
| Context window | 1.05M | 1.02M |
| Max output | 131K | 66K |
| Input $ / M tokens | $1.25 | $1 |
| Output $ / M tokens | $4.25 | $2.70 |
| Results tracked | 31 | 18 |
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Category by category
Coding Step 5 Preview leads
Muse Spark 1.2: 49.2 (#51), Step 5 Preview: 51.8 (#36)
| Benchmark | Muse Spark 1.2 | Step 5 Preview |
|---|---|---|
| LMArena WebDev | 1533 | 1564 |
| SciCode | 56.4% | 58.9% |
| LMArena Coding | 1495 | 1480 |
| DeepSWE | 54.9% | — |
| FrontierSWE | 12% | — |
| WeirdML | 60.3% | — |
Agentic & Tool Use Not comparable
Muse Spark 1.2: 29.4 (#87), Step 5 Preview: —
| Benchmark | Muse Spark 1.2 | Step 5 Preview |
|---|---|---|
| APEX-Agents | 36.4% | — |
| GDP.pdf | 16% | — |
Reasoning Muse Spark 1.2 leads
Muse Spark 1.2: 51.3 (#34), Step 5 Preview: 40.0 (#57)
| Benchmark | Muse Spark 1.2 | Step 5 Preview |
|---|---|---|
| CritPt | 17.7% | 20.9% |
| LMArena Hard Prompts | 1486 | 1465 |
| SimpleBench | 74.5% | — |
| NYT Connections (extended) | 79.2% | — |
| DTBench | 94.7% | — |
| LMCA | 48.4% | — |
| Epoch Capabilities Index | 154.87 | — |
Math Too close to call
Muse Spark 1.2: 46.4 (#70), Step 5 Preview: 46.1 (#72)
| Benchmark | Muse Spark 1.2 | Step 5 Preview |
|---|---|---|
| ProofBench | 43% | 42% |
| LMArena Math | 1471 | 1470 |
Knowledge Muse Spark 1.2 leads
Muse Spark 1.2: 54.1 (#53), Step 5 Preview: 41.2 (#112)
| Benchmark | Muse Spark 1.2 | Step 5 Preview |
|---|---|---|
| LMArena Expert | 1480 | 1470 |
| SimpleQA Verified | 60.3% | — |
Multimodal Muse Spark 1.2 leads
Muse Spark 1.2: 43.4 (#25), Step 5 Preview: 41.0 (#41)
| Benchmark | Muse Spark 1.2 | Step 5 Preview |
|---|---|---|
| LMArena Vision | 1305 | 1267 |
Multilingual Muse Spark 1.2 leads
Muse Spark 1.2: 57.1 (#11), Step 5 Preview: 53.8 (#54)
| Benchmark | Muse Spark 1.2 | Step 5 Preview |
|---|---|---|
| LMArena Non-English | 1478 | 1432 |
| LMArena Chinese | 1511 | 1519 |
| LMArena Russian | 1487 | 1436 |
| LMArena Spanish | 1498 | 1439 |
| LMArena French | 1513 | — |
Instruction Following Too close to call
Muse Spark 1.2: 76.7 (#36), Step 5 Preview: 76.0 (#50)
| Benchmark | Muse Spark 1.2 | Step 5 Preview |
|---|---|---|
| LMArena Instruction Following | 1461 | 1444 |
Long Context Too close to call
Muse Spark 1.2: 45.2 (#48), Step 5 Preview: 44.5 (#64)
| Benchmark | Muse Spark 1.2 | Step 5 Preview |
|---|---|---|
| LMArena Longer Query | 1475 | 1455 |
Writing & Preference Muse Spark 1.2 leads
Muse Spark 1.2: 72.3 (#14), Step 5 Preview: 62.8 (#71)
| Benchmark | Muse Spark 1.2 | Step 5 Preview |
|---|---|---|
| LMArena Text | 1482 | 1442 |
| LMArena Creative Writing | 1449 | 1410 |
| LMArena Multi-Turn | 1494 | 1447 |
| EQ-Bench Creative Writing | 1840 | — |
Frequently asked questions
Is Muse Spark 1.2 better than Step 5 Preview?
Muse Spark 1.2 is the stronger model overall, scoring 50.3 to 47.9 on the Noometry Index.
Which is cheaper, Muse Spark 1.2 or Step 5 Preview?
Step 5 Preview is cheaper. It lists at $1 per million input tokens and $2.70 per million output tokens; Muse Spark 1.2 lists at $1.25 and $4.25.
Is Muse Spark 1.2 or Step 5 Preview better for coding?
Step 5 Preview scores higher on coding benchmarks: 51.8 versus 49.2 in the Noometry coding category.
Which has the bigger context window?
Muse Spark 1.2 does, with 1.05M tokens against 1.02M.
How many benchmarks do Muse Spark 1.2 and Step 5 Preview share?
18 benchmarks have published results for both models. Muse Spark 1.2 has 31 scored results on Noometry and Step 5 Preview has 18.