# Muse Spark 1.3 vs Muse Spark Open

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

- Canonical page: https://benchlm.ai/compare/muse-spark-1-3-vs-muse-spark-open
- Last updated: October 15, 2026

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

## Quick Verdict

Evidence is too thin for a benchmark verdict: Muse Spark 1.3 and Muse Spark Open 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 Spark Open has the lower published output-token price.

## Model Snapshot

| Property | Muse Spark 1.3 | Muse Spark Open |
|----------|----------|----------|
| Creator | Meta | Meta |
| Type | Proprietary | Open Weight |
| Reasoning | Reasoning | Reasoning |
| Context | 1M | 1M |
| Independent public score (not head-to-head) | null | 62.66 |
| Benchmarks Covered | 20 | 7 |
| Pricing (input/output) | $1.25 / $4.25 | Pricing unavailable / Pricing unavailable |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- Muse Spark 1.3 public-lane score: Coming soon
- Muse Spark Open public-lane score: 60.2 (Estimated · #27/127)

| Benchmark | Muse Spark 1.3 | Muse Spark Open | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.1 | 88.8% | Coming soon | Coming soon |
| JobBench | 64.9% | 61.8% | Muse Spark 1.3 |
| OSWorld 2.0 | 66.9% | Coming soon | Coming soon |
| DeepSearchQA | 89.4% | Coming soon | Coming soon |
| AutomationBench | 49.4% | Coming soon | Coming soon |
| ApprenticeBench | 19% | Coming soon | Coming soon |
| Terminal-Bench 2.1 (Vals) | 72.3% | Coming soon | Coming soon |
| CWE-bench v1 | 55.0% | Coming soon | Coming soon |
| MazeBench | 0% | Coming soon | Coming soon |
| MCP Atlas | Coming soon | 89.2% | Coming soon |
| HLE w/ tools | Coming soon | 61.0% | Coming soon |
| Toolathlon-Verified | Coming soon | 72.8% | Coming soon |

### Coding

- Winner: Insufficient shared evidence
- Muse Spark 1.3 public-lane score: Coming soon
- Muse Spark Open public-lane score: 56.1 (Supported · #29/150)

| Benchmark | Muse Spark 1.3 | Muse Spark Open | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.1 | 88.8% | Coming soon | Coming soon |
| DeepSWE | 75.4% | Coming soon | Coming soon |
| SWE-Atlas Codebase QnA | 59.4% | Coming soon | Coming soon |
| CursorBench 4.0 | 41.6% | Coming soon | Coming soon |
| Bug Hunt Bench | 32.2 fixes | Coming soon | Coming soon |
| FrontierSWE v2 | 25.8% | Coming soon | Coming soon |

### Reasoning

- Winner: Insufficient shared evidence
- Muse Spark 1.3 public-lane score: 82.9 (#6/28)
- Muse Spark Open public-lane score: 79.6 (Unranked · 2 rankable rows)

| Benchmark | Muse Spark 1.3 | Muse Spark Open | Winner |
|-----------|-----------|-----------|--------|
| MRCR v2 256K-512K | 98.5% | Coming soon | Coming soon |
| MRCR v2 512K-1M | 98.1% | Coming soon | Coming soon |

### Multimodal & Grounded

- Winner: Insufficient shared evidence
- Muse Spark 1.3 public-lane score: Coming soon
- Muse Spark Open public-lane score: 83.6 (Unranked · 4 rankable rows)

| Benchmark | Muse Spark 1.3 | Muse Spark Open | Winner |
|-----------|-----------|-----------|--------|
| ZeroBench | Coming soon | 50.0% | Coming soon |
| BabyVision | Coming soon | 80.2% | Coming soon |
| SimpleVQA | Coming soon | 73.6% | Coming soon |

### Knowledge

- Winner: Insufficient shared evidence
- Muse Spark 1.3 public-lane score: Coming soon
- Muse Spark Open public-lane score: 64.6 (Supported · #38/184)

### Instruction Following

- Winner: Insufficient shared evidence
- Muse Spark 1.3 public-lane score: Coming soon
- Muse Spark Open public-lane score: Coming soon

| Benchmark | Muse Spark 1.3 | Muse Spark Open | Winner |
|-----------|-----------|-----------|--------|
| Gray Swan IPI (15 attempts) | 15.9% | Coming soon | Coming soon |

### Mathematics

- Winner: Insufficient shared evidence
- Muse Spark 1.3 public-lane score: 78.5 (Unranked · 2 rankable rows)
- Muse Spark Open public-lane score: Coming soon

| Benchmark | Muse Spark 1.3 | Muse Spark Open | Winner |
|-----------|-----------|-----------|--------|
| FrontierMath v2 (Tiers 1-3) | 74.035% | Coming soon | Coming soon |
| FrontierMath v2 (Tier 4) | 46.341% | Coming soon | Coming soon |

## FAQ

### Is there enough evidence to pick between Muse Spark 1.3 and Muse Spark Open?

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 Spark 1.3 vs Muse Spark 1.1](/compare/muse-spark-1-1-vs-muse-spark-1-3)
- [Muse Spark Open vs Muse Spark 1.1](/compare/muse-spark-1-1-vs-muse-spark-open)
- [Muse Spark 1.3 vs Muse Spark 1.2](/compare/muse-spark-1-2-vs-muse-spark-1-3)
- [Muse Spark Open vs Muse Spark 1.2](/compare/muse-spark-1-2-vs-muse-spark-open)

## Explore More

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