# Muse Spark 1.3 vs Step 5 Preview

> Side-by-side benchmark comparison for Muse Spark 1.3 and Step 5 Preview across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/muse-spark-1-3-vs-step-5-preview
- Last updated: September 21, 2026

- Shared sourced benchmarks: 5
- HTML indexing: indexable
- Ranking lane: BenchAlign v5

## Quick Verdict

Pick Step 5 Preview if you want the stronger benchmark profile. Muse Spark 1.3 only makes more sense when its price, context window, or workload-specific category wins matter more than the overall score.

## Summary

- Step 5 Preview leads overall 72 to 70.
- The clearest category separation is in reasoning, where the averages are 78 for Muse Spark 1.3 and 78.5 for Step 5 Preview.
- The biggest single benchmark swing is DeepSWE in Coding, with scores of 75.4% and 67.7%.
- Step 5 Preview is the cheaper option on output tokens, which matters if you expect large responses or heavy interactive use.

## Model Snapshot

| Property | Muse Spark 1.3 | Step 5 Preview |
|----------|----------|----------|
| Creator | Meta | StepFun |
| Type | Proprietary | Pending |
| Reasoning | Reasoning | Reasoning |
| Context | 1M | 1M |
| Overall Score | null | null |
| Benchmarks Covered | 13 | 22 |
| Pricing (input/output) | $1.25 / $4.25 | $1.00 / $2.70 |

## Category Breakdown

### Agentic

- Winner: Coming soon
- Muse Spark 1.3 public-lane score: Coming soon
- Step 5 Preview public-lane score: Coming soon

| Benchmark | Muse Spark 1.3 | Step 5 Preview | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.1 | 88.8% | 85.0% | Muse Spark 1.3 |
| JobBench | 64.9% | 59.0% | Muse Spark 1.3 |
| OSWorld 2.0 | 66.9% | Coming soon | Coming soon |
| DeepSearchQA | 89.4% | Coming soon | Coming soon |
| AutomationBench | 49.4% | 44.0% | Muse Spark 1.3 |
| ApprenticeBench | 19% | Coming soon | Coming soon |
| Terminal-Bench 2.1 (Vals) | 72.3% | Coming soon | Coming soon |
| Terminal-Bench 4.0 | Coming soon | 33.30% | Coming soon |
| CyberGym | Coming soon | 84.7% | Coming soon |
| Toolathlon-Verified | Coming soon | 74.1% | Coming soon |
| MCP Atlas | Coming soon | 85.6% | Coming soon |
| APEX-Agents | Coming soon | 37.8% | Coming soon |
| DRACO | Coming soon | 83.3% | Coming soon |
| BrowseComp | Coming soon | 88.7% | Coming soon |
| Agents' Last Exam | Coming soon | 29.5% | Coming soon |

### Coding

- Winner: Coming soon
- Muse Spark 1.3 public-lane score: Coming soon
- Step 5 Preview public-lane score: Coming soon

| Benchmark | Muse Spark 1.3 | Step 5 Preview | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.1 | 88.8% | 85.0% | Muse Spark 1.3 |
| DeepSWE | 75.4% | 67.7% | Muse Spark 1.3 |
| SWE-Atlas Codebase QnA | 59.4% | Coming soon | Coming soon |
| cursorBench40 | 41.6% | Coming soon | Coming soon |
| SciCode | Coming soon | 58.9% | Coming soon |
| ProgramBench | Coming soon | 80.5% | Coming soon |
| sweMarathon | Coming soon | 72.7% | Coming soon |
| MLS-Bench Lite | Coming soon | 40.5% | Coming soon |

### Reasoning

- Winner: Coming soon
- Muse Spark 1.3 public-lane score: 78 (#5/19)
- Step 5 Preview public-lane score: 78.5 (Unranked · 2 rankable rows)

| Benchmark | Muse Spark 1.3 | Step 5 Preview | Winner |
|-----------|-----------|-----------|--------|
| MRCR v2 256K-512K | 98.5% | Coming soon | Coming soon |
| MRCR v2 512K-1M | 98.1% | Coming soon | Coming soon |
| CritPt | Coming soon | 20.9% | Coming soon |

### Multimodal & Grounded

- Winner: Coming soon
- Muse Spark 1.3 public-lane score: Coming soon
- Step 5 Preview public-lane score: 61.2 (#28/49)

| Benchmark | Muse Spark 1.3 | Step 5 Preview | Winner |
|-----------|-----------|-----------|--------|
| OfficeQA Pro | Coming soon | 60.3% | Coming soon |
| MMMU-Pro | Coming soon | 76% | Coming soon |

### Knowledge

- Winner: Coming soon
- Muse Spark 1.3 public-lane score: Coming soon
- Step 5 Preview public-lane score: Coming soon

| Benchmark | Muse Spark 1.3 | Step 5 Preview | Winner |
|-----------|-----------|-----------|--------|
| GPQA-D | Coming soon | 93.5% | Coming soon |
| HLE | Coming soon | 46.5% | Coming soon |

## FAQ

### Which is better overall, Muse Spark 1.3 or Step 5 Preview?

Step 5 Preview is ahead overall on BenchLM right now.

### Where is the biggest gap between Muse Spark 1.3 and Step 5 Preview?

The widest category gap is in reasoning, where the averages are 78 for Muse Spark 1.3 and 78.5 for Step 5 Preview.

### How many benchmarks does Muse Spark 1.3 cover on BenchLM?

Muse Spark 1.3 currently has 13 sourced benchmark scores on BenchLM.

### How many benchmarks does Step 5 Preview cover on BenchLM?

Step 5 Preview currently has 22 sourced benchmark scores on BenchLM.

## Related Comparisons

- [Muse Spark 1.3 vs Muse Spark 1.2](/compare/muse-spark-1-2-vs-muse-spark-1-3)
- [Step 5 Preview vs Muse Spark 1.2](/compare/muse-spark-1-2-vs-step-5-preview)
- [Muse Spark 1.3 vs Muse Spark 1.1](/compare/muse-spark-1-1-vs-muse-spark-1-3)
- [Step 5 Preview vs Muse Spark 1.1](/compare/muse-spark-1-1-vs-step-5-preview)

## Explore More

- [Muse Spark 1.3 profile](/models/muse-spark-1-3)
- [Step 5 Preview profile](/models/step-5-preview)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)