# LongCat-2.5 vs Muse Spark Open

> Side-by-side benchmark comparison for LongCat-2.5 and Muse Spark Open across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/longcat-2-5-vs-muse-spark-open
- Last updated: November 9, 2026

- Shared sourced benchmarks: 3
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.8

## Quick Verdict

Evidence is too thin for a benchmark verdict: LongCat-2.5 and Muse Spark Open share only 3 sourced benchmark rows.

## Summary

- Only 3 shared sourced benchmark rows are 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 | LongCat-2.5 | Muse Spark Open |
|----------|----------|----------|
| Creator | Meituan | Meta |
| Type | Open Weight | Open Weight |
| Reasoning | Hybrid | Reasoning |
| Context | 1M | 1M |
| Independent public score (not head-to-head) | null | 51.08 |
| Benchmarks Covered | 22 | 9 |
| Pricing (input/output) | $0.30 / $1.20 | Pricing unavailable / Pricing unavailable |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- LongCat-2.5 public-lane score: Coming soon
- Muse Spark Open public-lane score: 51.9 (Estimated · #51/132)

| Benchmark | LongCat-2.5 | Muse Spark Open | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.1 | 88.4% | Coming soon | Coming soon |
| Terminal-Bench 4.0 | 38.50% | Coming soon | Coming soon |
| BrowseComp | 91.9% | Coming soon | Coming soon |
| AutomationBench | 51.8% | Coming soon | Coming soon |
| HLE w/ tools | 63.1% | 61.0% | LongCat-2.5 |
| Agents' Last Exam | 38.5% | Coming soon | Coming soon |
| MCP Atlas | 83.1% | 89.2% | Muse Spark Open |
| JobBench | 65.4% | 61.8% | LongCat-2.5 |
| skillsBench | 63.3% | Coming soon | Coming soon |
| SpreadsheetBench 2 | 34.9% | Coming soon | Coming soon |
| Claw-Eval | 78.3% | Coming soon | Coming soon |
| Toolathlon-Verified | Coming soon | 72.8% | Coming soon |
| MazeBench | Coming soon | 0% | Coming soon |

### Coding

- Winner: Insufficient shared evidence
- LongCat-2.5 public-lane score: Coming soon
- Muse Spark Open public-lane score: 51.4 (Supported · #45/158)

| Benchmark | LongCat-2.5 | Muse Spark Open | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.1 | 88.4% | Coming soon | Coming soon |
| ProgramBench | 25.5% | Coming soon | Coming soon |
| DeepSWE | 64.6% | Coming soon | Coming soon |
| PaperBench | 82.1% | Coming soon | Coming soon |
| SWE-Atlas Codebase QnA | 58.3% | Coming soon | Coming soon |
| NL2Repo | 60.5% | Coming soon | Coming soon |
| FrontierCode 2.0 | Coming soon | 6.2% | Coming soon |

### Reasoning

- Winner: Insufficient shared evidence
- LongCat-2.5 public-lane score: Coming soon
- Muse Spark Open public-lane score: 47.9 (Estimated · #57/157)

### Multimodal & Grounded

- Winner: Insufficient shared evidence
- LongCat-2.5 public-lane score: Coming soon
- Muse Spark Open public-lane score: Coming soon

| Benchmark | LongCat-2.5 | Muse Spark Open | Winner |
|-----------|-----------|-----------|--------|
| Vision2Web | 78.6% | Coming soon | Coming soon |
| CharXiv | 90.2% | Coming soon | Coming soon |
| MathVision w/ Python | 96.5% | Coming soon | Coming soon |
| Video-MME | 85.2% | Coming soon | Coming soon |
| 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
- LongCat-2.5 public-lane score: Coming soon
- Muse Spark Open public-lane score: 56.5 (Estimated · #56/179)

| Benchmark | LongCat-2.5 | Muse Spark Open | Winner |
|-----------|-----------|-----------|--------|
| FrontierScience | 77% | Coming soon | Coming soon |

## FAQ

### Is there enough evidence to pick between LongCat-2.5 and Muse Spark Open?

Not yet. The models share only 3 sourced benchmark rows, 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

- [LongCat-2.5 vs Claude Fable 5.2](/compare/claude-fable-5-2-vs-longcat-2-5)
- [Muse Spark Open vs Claude Fable 5.2](/compare/claude-fable-5-2-vs-muse-spark-open)
- [LongCat-2.5 vs Gemini 4 Carbon](/compare/gemini-4-carbon-vs-longcat-2-5)
- [Muse Spark Open vs Gemini 4 Carbon](/compare/gemini-4-carbon-vs-muse-spark-open)

## Explore More

- [LongCat-2.5 profile](/models/longcat-2-5)
- [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)