# Muse Spark 1.1 vs Step 5 Preview

> Muse Spark 1.1 is the stronger model overall, scoring 49.9 to 47.9 on the Noometry Index.

- Canonical page: https://noometry.com/compare/muse-spark-1-1-vs-step-5-preview
- Last updated: 2026-10-10
- Shared benchmarks: 18

## Summary

- They share 18 benchmarks with published results for both. Muse Spark 1.1 scores higher in 7 categories and Step 5 Preview in 2 categories; 5 gaps are clear of the uncertainty.
- The widest gap is in knowledge, where Muse Spark 1.1 leads 53.1 to 41.2.
- The biggest single-benchmark swing is CritPt: 15.1% for Muse Spark 1.1 and 20.9% for Step 5 Preview.
- Step 5 Preview is cheaper at $1 / $2.70 per million input/output tokens, against $1.25 / $4.25 for Muse Spark 1.1.
- Muse Spark 1.1 accepts more context: 1.05M tokens versus 1.02M.

## Snapshot

| | Muse Spark 1.1 | Step 5 Preview |
|---|---|---|
| Provider | Meta | StepFun |
| Noometry Index | 49.9 | 47.9 |
| Rank | 51 | 58 |
| Context | 1.05M | 1.02M |
| Input $/M | $1.25 | $1 |
| Output $/M | $4.25 | $2.70 |
| Weights | Proprietary | Proprietary |

## Coding

- Muse Spark 1.1: 51.3 (#40)
- Step 5 Preview: 51.8 (#36)

| Benchmark | Muse Spark 1.1 | Step 5 Preview |
|---|---|---|
| LMArena WebDev | 1542 | 1564 |
| SciCode | 58.8% | 58.9% |
| LMArena Coding | 1498 | 1480 |
| DeepSWE | 53.3% | — |

## Agentic & Tool Use

- Muse Spark 1.1: 30.8 (#73)
- Step 5 Preview: —

| Benchmark | Muse Spark 1.1 | Step 5 Preview |
|---|---|---|
| APEX-Agents | 31.8% | — |
| τ²-bench Banking | 40.5% | — |
| GBAEval | 7.9% | — |
| GDP.pdf | 15% | — |
| Vending-Bench 2 | 6,520 | — |

## Reasoning

- Muse Spark 1.1: 47.1 (#44)
- Step 5 Preview: 40.0 (#57)

| Benchmark | Muse Spark 1.1 | Step 5 Preview |
|---|---|---|
| CritPt | 15.1% | 20.9% |
| LMArena Hard Prompts | 1486 | 1465 |
| NYT Connections (extended) | 84.9% | — |
| DTBench | 94.4% | — |
| LMCA | 49.9% | — |
| Surface Evolver Bench | 52.5% | — |
| Epoch Capabilities Index | 154.21 | — |

## Math

- Muse Spark 1.1: 45.5 (#76)
- Step 5 Preview: 46.1 (#72)

| Benchmark | Muse Spark 1.1 | Step 5 Preview |
|---|---|---|
| ProofBench | 39% | 42% |
| LMArena Math | 1483 | 1470 |

## Knowledge

- Muse Spark 1.1: 53.1 (#59)
- Step 5 Preview: 41.2 (#112)

| Benchmark | Muse Spark 1.1 | Step 5 Preview |
|---|---|---|
| LMArena Expert | 1478 | 1470 |
| SimpleQA Verified | 57.8% | — |

## Multimodal

- Muse Spark 1.1: 42.6 (#29)
- Step 5 Preview: 41.0 (#41)

| Benchmark | Muse Spark 1.1 | Step 5 Preview |
|---|---|---|
| LMArena Vision | 1293 | 1267 |
| LMArena Document | 1465 | — |

## Multilingual

- Muse Spark 1.1: 56.7 (#17)
- Step 5 Preview: 53.8 (#54)

| Benchmark | Muse Spark 1.1 | Step 5 Preview |
|---|---|---|
| LMArena Non-English | 1472 | 1432 |
| LMArena Chinese | 1518 | 1519 |
| LMArena Russian | 1483 | 1436 |
| LMArena Spanish | 1464 | 1439 |
| LMArena French | 1494 | — |
| LMArena German | 1466 | — |
| LMArena Japanese | 1451 | — |
| LMArena Korean | 1458 | — |

## Instruction Following

- Muse Spark 1.1: 76.5 (#39)
- Step 5 Preview: 76.0 (#50)

| Benchmark | Muse Spark 1.1 | Step 5 Preview |
|---|---|---|
| LMArena Instruction Following | 1457 | 1444 |

## Long Context

- Muse Spark 1.1: 44.8 (#58)
- Step 5 Preview: 44.5 (#64)

| Benchmark | Muse Spark 1.1 | Step 5 Preview |
|---|---|---|
| LMArena Longer Query | 1462 | 1455 |

## Writing & Preference

- Muse Spark 1.1: 73.4 (#11)
- Step 5 Preview: 62.8 (#71)

| Benchmark | Muse Spark 1.1 | Step 5 Preview |
|---|---|---|
| LMArena Text | 1479 | 1442 |
| LMArena Creative Writing | 1437 | 1410 |
| LMArena Multi-Turn | 1485 | 1447 |
| EQ-Bench Creative Writing | 1927 | — |
| EQ-Bench 4 | 1260 | — |

## FAQ

### Is Muse Spark 1.1 better than Step 5 Preview?

Muse Spark 1.1 is the stronger model overall, scoring 49.9 to 47.9 on the Noometry Index.

### Which is cheaper, Muse Spark 1.1 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 1.1 lists at $1.25 and $4.25.

### Is Muse Spark 1.1 or Step 5 Preview better for coding?

They score almost the same on coding (51.3 vs 51.8); test both on your own repository before choosing.

### Which has the bigger context window?

Muse Spark 1.1 does, with 1.05M tokens against 1.02M.

### How many benchmarks do Muse Spark 1.1 and Step 5 Preview share?

18 benchmarks have published results for both models. Muse Spark 1.1 has 37 scored results on Noometry and Step 5 Preview has 18.