# Muse Ember vs Step 5 Preview

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

- Canonical page: https://benchlm.ai/compare/muse-ember-vs-step-5-preview
- Last updated: November 9, 2026

- Shared sourced benchmarks: 1
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.8

## Quick Verdict

Evidence is too thin for a benchmark verdict: Muse Ember and Step 5 Preview share only 1 sourced benchmark row.

## Summary

- Only 1 shared sourced benchmark row is available. That is not enough for a broad capability verdict, so this mirror does not name an overall winner.
- Muse Ember has the lower published output-token price.

## Model Snapshot

| Property | Muse Ember | Step 5 Preview |
|----------|----------|----------|
| Creator | Meta | StepFun |
| Type | Proprietary | Open Weight |
| Reasoning | Reasoning | Reasoning |
| Context | 1M | 1M |
| Independent public score (not head-to-head) | 56.24 | 56.59 |
| Benchmarks Covered | 4 | 24 |
| Pricing (input/output) | $0.10 / $0.50 | $1.00 / $2.70 |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- Muse Ember public-lane score: Coming soon
- Step 5 Preview public-lane score: 54.9 (Estimated · #45/132)

| Benchmark | Muse Ember | Step 5 Preview | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 4.0 | 40.90% | 33.30% | Muse Ember |
| OSWorld 2.1 | 69.5% | Coming soon | Coming soon |
| Agents' Last Exam (Linux) | 61.6% | Coming soon | Coming soon |
| Terminal-Bench 2.1 | Coming soon | 85.0% | Coming soon |
| CyberGym | Coming soon | 84.7% | Coming soon |
| AutomationBench | Coming soon | 44.0% | Coming soon |
| Toolathlon-Verified | Coming soon | 74.1% | Coming soon |
| MCP Atlas | Coming soon | 85.6% | Coming soon |
| JobBench | Coming soon | 59.0% | 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 |
| Hermes Index | Coming soon | 32.8% | Coming soon |
| Hermes Bench | Coming soon | 69.2% | Coming soon |

### Coding

- Winner: Insufficient shared evidence
- Muse Ember public-lane score: Coming soon
- Step 5 Preview public-lane score: 49.1 (Estimated · #50/158)

| Benchmark | Muse Ember | Step 5 Preview | Winner |
|-----------|-----------|-----------|--------|
| DeepSWE | Coming soon | 67.7% | Coming soon |
| Terminal-Bench 2.1 | Coming soon | 85.0% | 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: Insufficient shared evidence
- Muse Ember public-lane score: Coming soon
- Step 5 Preview public-lane score: 52.5 (Estimated · #48/157)

| Benchmark | Muse Ember | Step 5 Preview | Winner |
|-----------|-----------|-----------|--------|
| CritPt | Coming soon | 20.9% | Coming soon |

### Multimodal & Grounded

- Winner: Insufficient shared evidence
- Muse Ember public-lane score: Coming soon
- Step 5 Preview public-lane score: 59.5 (Estimated · #38/67)

| Benchmark | Muse Ember | Step 5 Preview | Winner |
|-----------|-----------|-----------|--------|
| PerceptionBench (tools) | 80.6% | Coming soon | Coming soon |
| OfficeQA Pro | Coming soon | 60.3% | Coming soon |
| MMMU-Pro | Coming soon | 76% | Coming soon |

### Knowledge

- Winner: Insufficient shared evidence
- Muse Ember public-lane score: Coming soon
- Step 5 Preview public-lane score: 60.2 (Supported · #45/179)

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

## FAQ

### Is there enough evidence to pick between Muse Ember and Step 5 Preview?

Not yet. The models share only 1 sourced benchmark row, so this mirror reports the available measurements and metadata without naming a broad winner.

### What can I compare safely on this page?

Published pricing, context windows, model type, and individual shared benchmark rows are directly comparable. Independent overall scores and non-overlapping benchmark coverage are labeled separately and should not be read as a controlled head-to-head result.

## Related Comparisons

- [Muse Ember vs Claude Fable 5.2](/compare/claude-fable-5-2-vs-muse-ember)
- [Step 5 Preview vs Claude Fable 5.2](/compare/claude-fable-5-2-vs-step-5-preview)
- [Muse Ember vs Gemini 4 Carbon](/compare/gemini-4-carbon-vs-muse-ember)
- [Step 5 Preview vs Gemini 4 Carbon](/compare/gemini-4-carbon-vs-step-5-preview)

## Explore More

- [Muse Ember profile](/models/muse-ember)
- [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)