# GPT-5.5 vs Muse Spark

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

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

- Shared sourced benchmarks: 12
- HTML indexing: indexable
- Ranking lane: BenchAlign v5

## Quick Verdict

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

## Summary

- GPT-5.5 leads overall 73.27 to 68.39.
- The clearest category separation is in reasoning, where the averages are 63.5 for GPT-5.5 and 45.9 for Muse Spark.
- The biggest single benchmark swing is Vibe Code Bench in Coding, with scores of 69.85% and 19.67%.
- GPT-5.5 also has the larger context window at 1M.

## Model Snapshot

| Property | GPT-5.5 | Muse Spark |
|----------|----------|----------|
| Creator | OpenAI | Meta |
| Type | Proprietary | Proprietary |
| Reasoning | Reasoning | Reasoning |
| Context | 1M | 262K |
| Overall Score | 73.27 | 68.39 |
| Benchmarks Covered | 38 | 24 |
| Pricing (input/output) | $5.00 / $30.00 | N/A |

## Category Breakdown

### Agentic

- Winner: GPT-5.5
- GPT-5.5 public-lane score: 63.9 (Supported · #15/151)
- Muse Spark public-lane score: 58.8 (Supported · #31/151)

| Benchmark | GPT-5.5 | Muse Spark | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.0 | 82% | 59% | GPT-5.5 |
| CyberGym | 81.8% | 43.5% | GPT-5.5 |
| BrowseComp | 84.4% | Coming soon | Coming soon |
| OSWorld-Verified | 78.7% | Coming soon | Coming soon |
| MCP Atlas | 75.3% | Coming soon | Coming soon |
| Toolathlon | 55.6% | Coming soon | Coming soon |
| τ²-bench results | 98% | 91.5% | GPT-5.5 |
| Gert Labs | 72.93% | Coming soon | Coming soon |
| ResearchClawBench | 17.0% | Coming soon | Coming soon |
| OSWorld 2.0 | 13.0% | Coming soon | Coming soon |
| JobBench | 42.7% | Coming soon | Coming soon |
| ExploitGym | 13.4% | Coming soon | Coming soon |
| Terminal-Bench 2.1 (Vals) | 76.4% | Coming soon | Coming soon |
| DeepSearchQA | Coming soon | 74.8% | Coming soon |
| Claw-Eval | Coming soon | 63.8% | Coming soon |

### Coding

- Winner: GPT-5.5
- GPT-5.5 public-lane score: 67.7 (Supported · #8/183)
- Muse Spark public-lane score: 59.2 (Supported · #28/183)

| Benchmark | GPT-5.5 | Muse Spark | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Pro | 58.6% | 52.4% | GPT-5.5 |
| Terminal-Bench 2.0 | 82.0% | Coming soon | Coming soon |
| Vibe Code Bench | 69.85% | 19.67% | GPT-5.5 |
| React Native Evals | 84.7% | Coming soon | Coming soon |
| cursorBench31 | 59.2% | Coming soon | Coming soon |
| cursorBench32 | 58.4% | Coming soon | Coming soon |
| FrontierCode 1.1 Main | 43.0% | Coming soon | Coming soon |
| LiveCodeBench (Vals) | 85.3% | Coming soon | Coming soon |
| SWE-bench (Vals) | 82.6% | Coming soon | Coming soon |
| SWE-bench Verified | Coming soon | 77.4% | Coming soon |
| LiveCodeBench Pro | Coming soon | 80.0% | Coming soon |

### Multimodal & Grounded

- Winner: Coming soon
- GPT-5.5 public-lane score: 71.3 (#19/48)
- Muse Spark public-lane score: 77.5 (#14/48)

| Benchmark | GPT-5.5 | Muse Spark | Winner |
|-----------|-----------|-----------|--------|
| MMMU-Pro | 81.2% | 80.4% | GPT-5.5 |
| MMMU-Pro w/ Python | 83.2% | Coming soon | Coming soon |
| OfficeQA Pro | 54.1% | Coming soon | Coming soon |
| CharXiv | Coming soon | 86.4% | 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 public-lane score: 63.5 (#15/22)
- Muse Spark public-lane score: 45.9 (Unranked · 3 rankable rows)

| Benchmark | GPT-5.5 | Muse Spark | Winner |
|-----------|-----------|-----------|--------|
| MRCR v2 64K-128K | 83.1% | Coming soon | Coming soon |
| MRCR v2 128K-256K | 87.5% | Coming soon | Coming soon |
| ARC-AGI-2 | 85% | 42.5% | GPT-5.5 |
| ARC-AGI-3 | 0.4% | Coming soon | Coming soon |

### Knowledge

- Winner: GPT-5.5
- GPT-5.5 public-lane score: 73.3 (Supported · #7/181)
- Muse Spark public-lane score: 65.7 (Supported · #23/181)

| Benchmark | GPT-5.5 | Muse Spark | Winner |
|-----------|-----------|-----------|--------|
| GPQA | 93.6% | Coming soon | Coming soon |
| GPQA-D | 93.6% | 89.5% | GPT-5.5 |
| HLE | 52.2% | 50.4% | GPT-5.5 |
| HLE w/o tools | 41.4% | 42.8% | Muse Spark |
| GPQA Diamond (Vals) | 93.2% | Coming soon | Coming soon |
| MMLU-Pro (Vals) | 88.1% | Coming soon | 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 public-lane score: 92.9 (#7/120)
- Muse Spark public-lane score: 92.9 (#8/120)

### Mathematics

- Winner: Coming soon
- GPT-5.5 public-lane score: 69.6 (Unranked · 3 rankable rows)
- Muse Spark public-lane score: 55.3 (Unranked · 2 rankable rows)

| Benchmark | GPT-5.5 | Muse Spark | Winner |
|-----------|-----------|-----------|--------|
| FrontierMath (legacy) | 51.7% | Coming soon | Coming soon |
| FrontierMath v2 (Tiers 1-3) | 51.700% | 39.000% | GPT-5.5 |
| FrontierMath v2 (Tier 4) | 35.400% | 14.600% | GPT-5.5 |

## FAQ

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

GPT-5.5 is ahead overall on BenchLM right now.

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

The widest category gap is in reasoning, where the averages are 63.5 for GPT-5.5 and 45.9 for Muse Spark.

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

GPT-5.5 currently has 38 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 vs GPT-5.5 Pro](/compare/gpt-5-5-vs-gpt-5-5-pro)
- [Muse Spark vs GPT-5.5 Pro](/compare/gpt-5-5-pro-vs-muse-spark)
- [GPT-5.5 vs Muse Spark 1.2](/compare/gpt-5-5-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 profile](/models/gpt-5-5)
- [Muse Spark profile](/models/muse-spark)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)