# Muse Spark vs Solar Open 2

> Side-by-side benchmark comparison for Muse Spark and Solar Open 2 across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/muse-spark-vs-solar-open-2
- Last updated: September 10, 2026

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

## Quick Verdict

Evidence is too thin for a benchmark verdict: Muse Spark and Solar Open 2 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.
- Solar Open 2 has the larger published context window at 1M.

## Model Snapshot

| Property | Muse Spark | Solar Open 2 |
|----------|----------|----------|
| Creator | Meta | Upstage |
| Type | Proprietary | Open Weight |
| Reasoning | Reasoning | Reasoning |
| Context | 262K | 1M |
| Independent public score (not head-to-head) | 67.69 | null |
| Benchmarks Covered | 24 | 11 |
| Pricing (input/output) | N/A | $0.00 / $0.00 |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- Muse Spark public-lane score: 56.1 (Supported · #34/152)
- Solar Open 2 public-lane score: Coming soon

| Benchmark | Muse Spark | Solar Open 2 | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.0 | 59% | Coming soon | Coming soon |
| τ²-bench results | 91.5% | Coming soon | Coming soon |
| DeepSearchQA | 74.8% | Coming soon | Coming soon |
| CyberGym | 43.5% | Coming soon | Coming soon |
| Claw-Eval | 63.8% | Coming soon | Coming soon |
| terminalBenchHard | Coming soon | 28.3% | Coming soon |
| APEX-Agents | Coming soon | 16.6% | Coming soon |
| MCP Atlas | Coming soon | 58.2% | Coming soon |

### Coding

- Winner: Insufficient shared evidence
- Muse Spark public-lane score: 59 (Supported · #25/151)
- Solar Open 2 public-lane score: Coming soon

| Benchmark | Muse Spark | Solar Open 2 | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Verified | 77.4% | 70.4% | Muse Spark |
| SWE-bench Pro | 52.4% | Coming soon | Coming soon |
| LiveCodeBench Pro | 80.0% | Coming soon | Coming soon |
| Vibe Code Bench | 19.67% | Coming soon | Coming soon |
| LiveCodeBench v6 | Coming soon | 92.4% | Coming soon |

### Multimodal & Grounded

- Winner: Insufficient shared evidence
- Muse Spark public-lane score: 77.5 (#14/48)
- Solar Open 2 public-lane score: Coming soon

| Benchmark | Muse Spark | Solar Open 2 | Winner |
|-----------|-----------|-----------|--------|
| CharXiv | 86.4% | Coming soon | Coming soon |
| MMMU-Pro | 80.4% | Coming soon | Coming soon |
| ERQA | 64.7% | Coming soon | Coming soon |
| SimpleVQA | 71.3% | Coming soon | Coming soon |
| ScreenSpot Pro | 84.1% | Coming soon | Coming soon |
| ZeroBench | 33.0% | Coming soon | Coming soon |
| MedXpertQA (MM) | 78.4% | Coming soon | Coming soon |

### Reasoning

- Winner: Insufficient shared evidence
- Muse Spark public-lane score: 45.1 (Unranked · 3 rankable rows)
- Solar Open 2 public-lane score: Coming soon

| Benchmark | Muse Spark | Solar Open 2 | Winner |
|-----------|-----------|-----------|--------|
| ARC-AGI-2 | 42.5% | Coming soon | Coming soon |

### Knowledge

- Winner: Insufficient shared evidence
- Muse Spark public-lane score: 65.4 (Supported · #24/183)
- Solar Open 2 public-lane score: Coming soon

| Benchmark | Muse Spark | Solar Open 2 | Winner |
|-----------|-----------|-----------|--------|
| GPQA-D | 89.5% | 86.3% | Muse Spark |
| HLE | 50.4% | Coming soon | Coming soon |
| HLE w/o tools | 42.8% | 28.8% | Muse Spark |
| HealthBench Hard | 42.8% | Coming soon | Coming soon |
| MedXpertQA (Text) | 52.6% | Coming soon | Coming soon |
| MMLU-Pro | Coming soon | 86.2% | Coming soon |

### Instruction Following

- Winner: Insufficient shared evidence
- Muse Spark public-lane score: 93.2 (#8/123)
- Solar Open 2 public-lane score: Coming soon

| Benchmark | Muse Spark | Solar Open 2 | Winner |
|-----------|-----------|-----------|--------|
| IFBench | Coming soon | 80% | Coming soon |

### Mathematics

- Winner: Insufficient shared evidence
- Muse Spark public-lane score: 55.3 (Unranked · 2 rankable rows)
- Solar Open 2 public-lane score: Coming soon

| Benchmark | Muse Spark | Solar Open 2 | Winner |
|-----------|-----------|-----------|--------|
| FrontierMath v2 (Tiers 1-3) | 39.000% | Coming soon | Coming soon |
| FrontierMath v2 (Tier 4) | 14.600% | Coming soon | Coming soon |
| HMMT Feb 2026 | Coming soon | 93.9% | Coming soon |
| AIME26 | Coming soon | 95.7% | Coming soon |

## FAQ

### Is there enough evidence to pick between Muse Spark and Solar Open 2?

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

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

## Explore More

- [Muse Spark profile](/models/muse-spark)
- [Solar Open 2 profile](/models/solar-open-2)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)