# GPT-5.5 Pro vs Muse Spark

> Side-by-side benchmark comparison for GPT-5.5 Pro and Muse Spark across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/gpt-5-5-pro-vs-muse-spark
- Last updated: September 4, 2026

- Shared sourced benchmarks: 4
- HTML indexing: indexable
- Ranking lane: BenchAlign v5

## Quick Verdict

Pick Muse Spark if you want the stronger benchmark profile. GPT-5.5 Pro only makes more sense when its price, context window, or workload-specific category wins matter more than the overall score.

## Summary

- Muse Spark leads overall 68.39 to 63.07.
- The clearest category separation is in mathematics, where the averages are 70.2 for GPT-5.5 Pro and 55.3 for Muse Spark.
- The biggest single benchmark swing is FrontierMath v2 (Tier 4) in Mathematics, with scores of 39.600% and 14.600%.
- GPT-5.5 Pro also has the larger context window at 1M.

## Model Snapshot

| Property | GPT-5.5 Pro | Muse Spark |
|----------|----------|----------|
| Creator | OpenAI | Meta |
| Type | Proprietary | Proprietary |
| Reasoning | Reasoning | Reasoning |
| Context | 1M | 262K |
| Overall Score | 63.07 | 68.39 |
| Benchmarks Covered | 6 | 24 |
| Pricing (input/output) | $30.00 / $180.00 | N/A |

## Category Breakdown

### Agentic

- Winner: Coming soon
- GPT-5.5 Pro public-lane score: 60.6 (Estimated · #24/151)
- Muse Spark public-lane score: 58.8 (Supported · #31/151)

| Benchmark | GPT-5.5 Pro | Muse Spark | Winner |
|-----------|-----------|-----------|--------|
| BrowseComp | 90.1% | Coming soon | Coming soon |
| Terminal-Bench 2.0 | Coming soon | 59% | Coming soon |
| τ²-bench results | Coming soon | 91.5% | Coming soon |
| DeepSearchQA | Coming soon | 74.8% | Coming soon |
| CyberGym | Coming soon | 43.5% | Coming soon |
| Claw-Eval | Coming soon | 63.8% | Coming soon |

### Coding

- Winner: Coming soon
- GPT-5.5 Pro public-lane score: Coming soon
- Muse Spark public-lane score: 59.2 (Supported · #28/183)

| Benchmark | GPT-5.5 Pro | Muse Spark | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Verified | Coming soon | 77.4% | Coming soon |
| SWE-bench Pro | Coming soon | 52.4% | Coming soon |
| LiveCodeBench Pro | Coming soon | 80.0% | Coming soon |
| Vibe Code Bench | Coming soon | 19.67% | Coming soon |

### Multimodal & Grounded

- Winner: Coming soon
- GPT-5.5 Pro public-lane score: Coming soon
- Muse Spark public-lane score: 77.5 (#14/48)

| Benchmark | GPT-5.5 Pro | Muse Spark | Winner |
|-----------|-----------|-----------|--------|
| CharXiv | Coming soon | 86.4% | Coming soon |
| MMMU-Pro | Coming soon | 80.4% | Coming soon |
| ERQA | Coming soon | 64.7% | Coming soon |
| SimpleVQA | Coming soon | 71.3% | Coming soon |
| ScreenSpot Pro | Coming soon | 84.1% | Coming soon |
| ZeroBench | Coming soon | 33.0% | Coming soon |
| MedXpertQA (MM) | Coming soon | 78.4% | Coming soon |

### Reasoning

- Winner: Coming soon
- GPT-5.5 Pro public-lane score: Coming soon
- Muse Spark public-lane score: 45.9 (Unranked · 3 rankable rows)

| Benchmark | GPT-5.5 Pro | Muse Spark | Winner |
|-----------|-----------|-----------|--------|
| ARC-AGI-2 | Coming soon | 42.5% | Coming soon |

### Knowledge

- Winner: Coming soon
- GPT-5.5 Pro public-lane score: 61.1 (Estimated · #36/181)
- Muse Spark public-lane score: 65.7 (Supported · #23/181)

| Benchmark | GPT-5.5 Pro | Muse Spark | Winner |
|-----------|-----------|-----------|--------|
| HLE | 57.2% | 50.4% | GPT-5.5 Pro |
| HLE w/o tools | 43.1% | 42.8% | GPT-5.5 Pro |
| GPQA-D | Coming soon | 89.5% | Coming soon |
| HealthBench Hard | Coming soon | 42.8% | Coming soon |
| MedXpertQA (Text) | Coming soon | 52.6% | Coming soon |

### Instruction Following

- Winner: Coming soon
- GPT-5.5 Pro public-lane score: Coming soon
- Muse Spark public-lane score: 92.9 (#8/120)

### Mathematics

- Winner: Coming soon
- GPT-5.5 Pro public-lane score: 70.2 (Unranked · 3 rankable rows)
- Muse Spark public-lane score: 55.3 (Unranked · 2 rankable rows)

| Benchmark | GPT-5.5 Pro | Muse Spark | Winner |
|-----------|-----------|-----------|--------|
| FrontierMath (legacy) | 52.4% | Coming soon | Coming soon |
| FrontierMath v2 (Tiers 1-3) | 51.000% | 39.000% | GPT-5.5 Pro |
| FrontierMath v2 (Tier 4) | 39.600% | 14.600% | GPT-5.5 Pro |

## FAQ

### Which is better overall, GPT-5.5 Pro or Muse Spark?

Muse Spark is ahead overall on BenchLM right now.

### Where is the biggest gap between GPT-5.5 Pro and Muse Spark?

The widest category gap is in mathematics, where the averages are 70.2 for GPT-5.5 Pro and 55.3 for Muse Spark.

### How many benchmarks does GPT-5.5 Pro cover on BenchLM?

GPT-5.5 Pro currently has 6 sourced benchmark scores on BenchLM.

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

Muse Spark currently has 24 sourced benchmark scores on BenchLM.

## Related Comparisons

- [GPT-5.5 Pro vs GPT-5.5](/compare/gpt-5-5-vs-gpt-5-5-pro)
- [Muse Spark vs GPT-5.5](/compare/gpt-5-5-vs-muse-spark)
- [GPT-5.5 Pro vs Muse Spark 1.2](/compare/gpt-5-5-pro-vs-muse-spark-1-2)
- [Muse Spark vs Muse Spark 1.2](/compare/muse-spark-vs-muse-spark-1-2)

## Explore More

- [GPT-5.5 Pro profile](/models/gpt-5-5-pro)
- [Muse Spark profile](/models/muse-spark)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)