# Muse Spark 1.3 vs Ultramarine 1 Flash

> Side-by-side benchmark comparison for Muse Spark 1.3 and Ultramarine 1 Flash across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

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

- Shared sourced benchmarks: 5
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.8

## Quick Verdict

Pick Muse Spark 1.3 if you want the stronger benchmark profile. Ultramarine 1 Flash only makes more sense when its price, context window, or workload-specific category wins matter more than the overall score.

## Summary

- Muse Spark 1.3 leads overall 73 to 0.
- The biggest single benchmark swing is DeepSWE in Coding, with scores of 75.4% and 61.5%.
- Ultramarine 1 Flash is the cheaper option on output tokens, which matters if you expect large responses or heavy interactive use.
- Muse Spark 1.3 also has the larger context window at 1M.

## Model Snapshot

| Property | Muse Spark 1.3 | Ultramarine 1 Flash |
|----------|----------|----------|
| Creator | Meta | Paper Instruments |
| Type | Proprietary | Proprietary |
| Reasoning | Reasoning | Reasoning |
| Context | 1M | Not disclosed |
| Overall Score | null | null |
| Benchmarks Covered | 19 | 5 |
| Pricing (input/output) | $1.25 / $4.25 | $0.15 / $0.50 |

## Category Breakdown

### Agentic

- Winner: Not comparable
- Muse Spark 1.3 public-lane score: Coming soon
- Ultramarine 1 Flash public-lane score: Coming soon

| Benchmark | Muse Spark 1.3 | Ultramarine 1 Flash | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.1 | 88.8% | 83.2% | Muse Spark 1.3 |
| JobBench | 64.9% | 62.9% | Muse Spark 1.3 |
| OSWorld 2.0 | 66.9% | Coming soon | Coming soon |
| DeepSearchQA | 89.4% | Coming soon | Coming soon |
| AutomationBench | 49.4% | 50.2% | Ultramarine 1 Flash |
| 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 |

### Coding

- Winner: Not comparable
- Muse Spark 1.3 public-lane score: Coming soon
- Ultramarine 1 Flash public-lane score: Coming soon

| Benchmark | Muse Spark 1.3 | Ultramarine 1 Flash | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.1 | 88.8% | 83.2% | Muse Spark 1.3 |
| DeepSWE | 75.4% | 61.5% | Muse Spark 1.3 |
| 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: Not comparable
- Muse Spark 1.3 public-lane score: 82.9 (#6/29)
- Ultramarine 1 Flash public-lane score: Coming soon

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

### Instruction Following

- Winner: Not comparable
- Muse Spark 1.3 public-lane score: Coming soon
- Ultramarine 1 Flash public-lane score: Coming soon

| Benchmark | Muse Spark 1.3 | Ultramarine 1 Flash | Winner |
|-----------|-----------|-----------|--------|
| Gray Swan IPI (15 attempts) | 15.9% | Coming soon | Coming soon |

### Mathematics

- Winner: Not comparable
- Muse Spark 1.3 public-lane score: 78.5 (Unranked · 2 rankable rows)
- Ultramarine 1 Flash public-lane score: Coming soon

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

## FAQ

### Which is better overall, Muse Spark 1.3 or Ultramarine 1 Flash?

Muse Spark 1.3 is ahead overall on BenchLM right now.

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

Muse Spark 1.3 currently has 19 sourced benchmark scores on BenchLM.

### How many benchmarks does Ultramarine 1 Flash cover on BenchLM?

Ultramarine 1 Flash currently has 5 sourced benchmark scores on BenchLM.

## Related Comparisons

- [Muse Spark 1.3 vs Muse Spark 1.1](/compare/muse-spark-1-1-vs-muse-spark-1-3)
- [Ultramarine 1 Flash vs Muse Spark 1.1](/compare/muse-spark-1-1-vs-ultramarine-1-flash)
- [Muse Spark 1.3 vs Muse Spark 1.2](/compare/muse-spark-1-2-vs-muse-spark-1-3)
- [Ultramarine 1 Flash vs Muse Spark 1.2](/compare/muse-spark-1-2-vs-ultramarine-1-flash)

## Explore More

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