# GPT-5.5 vs Muse Spark 1.3

> Side-by-side benchmark comparison for GPT-5.5 and Muse Spark 1.3 across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/gpt-5-5-vs-muse-spark-1-3
- Last updated: October 17, 2026

- Shared sourced benchmarks: 7
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.8

## Quick Verdict

Pick Muse Spark 1.3 if you want the stronger benchmark profile. GPT-5.5 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 69.29.
- The clearest category separation is in mathematics, where the averages are 91.2 for GPT-5.5 and 78.5 for Muse Spark 1.3.
- The biggest single benchmark swing is OSWorld 2.0 in Agentic, with scores of 13.0% and 66.9%.
- Muse Spark 1.3 is the cheaper option on output tokens, which matters if you expect large responses or heavy interactive use.

## Model Snapshot

| Property | GPT-5.5 | Muse Spark 1.3 |
|----------|----------|----------|
| Creator | OpenAI | Meta |
| Type | Proprietary | Proprietary |
| Reasoning | Reasoning | Reasoning |
| Context | 1M | 1M |
| Overall Score | 69.29 | null |
| Benchmarks Covered | 42 | 20 |
| Pricing (input/output) | $5.00 / $30.00 | $1.25 / $4.25 |

## Category Breakdown

### Agentic

- Winner: Not comparable
- GPT-5.5 public-lane score: 62.7 (Supported · #23/128)
- Muse Spark 1.3 public-lane score: Coming soon

| Benchmark | GPT-5.5 | Muse Spark 1.3 | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.0 | 82% | Coming soon | Coming soon |
| CyberGym | 81.8% | Coming soon | Coming soon |
| 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% | Coming soon | Coming soon |
| Gert Labs | 72.93% | Coming soon | Coming soon |
| ResearchClawBench | 17.0% | Coming soon | Coming soon |
| OSWorld 2.0 | 13.0% | 66.9% | Muse Spark 1.3 |
| JobBench | 42.7% | 64.9% | Muse Spark 1.3 |
| ExploitGym | 13.4% | Coming soon | Coming soon |
| Terminal-Bench 2.1 (Vals) | 76.4% | 72.3% | GPT-5.5 |
| ApprenticeBench | 20% | 19% | GPT-5.5 |
| MazeBench | 0% | 0% | Tie |
| Terminal-Bench 2.1 | Coming soon | 88.8% | Coming soon |
| DeepSearchQA | Coming soon | 89.4% | Coming soon |
| AutomationBench | Coming soon | 49.4% | Coming soon |
| CWE-bench v1 | Coming soon | 55.0% | Coming soon |

### Coding

- Winner: Not comparable
- GPT-5.5 public-lane score: 62 (Supported · #14/150)
- Muse Spark 1.3 public-lane score: Coming soon

| Benchmark | GPT-5.5 | Muse Spark 1.3 | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Pro | 58.6% | Coming soon | Coming soon |
| Terminal-Bench 2.0 | 82.0% | Coming soon | Coming soon |
| Vibe Code Bench | 69.85% | Coming soon | Coming soon |
| React Native Evals | 84.7% | Coming soon | Coming soon |
| cursorBench31 | 59.2% | Coming soon | Coming soon |
| CursorBench 3.2 | 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 |
| PostTrainBench v1.1 | 27.2% | Coming soon | Coming soon |
| Terminal-Bench 2.1 | Coming soon | 88.8% | Coming soon |
| DeepSWE | Coming soon | 75.4% | Coming soon |
| SWE-Atlas Codebase QnA | Coming soon | 59.4% | Coming soon |
| CursorBench 4.0 | Coming soon | 41.6% | Coming soon |
| Bug Hunt Bench | Coming soon | 32.2 fixes | Coming soon |
| FrontierSWE v2 | Coming soon | 25.8% | Coming soon |

### Reasoning

- Winner: Directional only
- GPT-5.5 public-lane score: 70.4 (#20/28)
- Muse Spark 1.3 public-lane score: 82.9 (#6/28)

| Benchmark | GPT-5.5 | Muse Spark 1.3 | 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% | Coming soon | Coming soon |
| ARC-AGI-3 | 0.4% | Coming soon | Coming soon |
| ARC-AGI-1 | 95.00% | Coming soon | Coming soon |
| MRCR v2 256K-512K | Coming soon | 98.5% | Coming soon |
| MRCR v2 512K-1M | Coming soon | 98.1% | Coming soon |

### Multimodal & Grounded

- Winner: Not comparable
- GPT-5.5 public-lane score: 75.5 (#23/54)
- Muse Spark 1.3 public-lane score: Coming soon

| Benchmark | GPT-5.5 | Muse Spark 1.3 | Winner |
|-----------|-----------|-----------|--------|
| MMMU-Pro | 81.2% | Coming soon | Coming soon |
| MMMU-Pro w/ Python | 83.2% | Coming soon | Coming soon |
| OfficeQA Pro | 54.1% | Coming soon | Coming soon |

### Knowledge

- Winner: Not comparable
- GPT-5.5 public-lane score: 72.1 (Supported · #14/184)
- Muse Spark 1.3 public-lane score: Coming soon

| Benchmark | GPT-5.5 | Muse Spark 1.3 | Winner |
|-----------|-----------|-----------|--------|
| GPQA | 93.6% | Coming soon | Coming soon |
| GPQA-D | 93.6% | Coming soon | Coming soon |
| HLE | 52.2% | Coming soon | Coming soon |
| HLE w/o tools | 41.4% | Coming soon | Coming soon |
| GPQA Diamond (Vals) | 93.2% | Coming soon | Coming soon |
| MMLU-Pro (Vals) | 88.1% | Coming soon | Coming soon |

### Instruction Following

- Winner: Not comparable
- GPT-5.5 public-lane score: 93.3 (#8/148)
- Muse Spark 1.3 public-lane score: Coming soon

| Benchmark | GPT-5.5 | Muse Spark 1.3 | Winner |
|-----------|-----------|-----------|--------|
| Gray Swan IPI (15 attempts) | Coming soon | 15.9% | Coming soon |

### Mathematics

- Winner: Not comparable
- GPT-5.5 public-lane score: 91.2 (Unranked · 3 rankable rows)
- Muse Spark 1.3 public-lane score: 78.5 (Unranked · 2 rankable rows)

| Benchmark | GPT-5.5 | Muse Spark 1.3 | Winner |
|-----------|-----------|-----------|--------|
| FrontierMath (legacy) | 51.7% | Coming soon | Coming soon |
| FrontierMath v2 (Tiers 1-3) | 85.263% | 74.035% | GPT-5.5 |
| FrontierMath v2 (Tier 4) | 72.500% | 46.341% | GPT-5.5 |

## FAQ

### Which is better overall, GPT-5.5 or Muse Spark 1.3?

Muse Spark 1.3 is ahead overall on BenchLM right now.

### Where is the biggest gap between GPT-5.5 and Muse Spark 1.3?

The widest category gap is in mathematics, where the averages are 91.2 for GPT-5.5 and 78.5 for Muse Spark 1.3.

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

GPT-5.5 currently has 42 sourced benchmark scores on BenchLM.

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

Muse Spark 1.3 currently has 20 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 1.3 vs GPT-5.5 Pro](/compare/gpt-5-5-pro-vs-muse-spark-1-3)
- [GPT-5.5 vs Muse Spark 1.1](/compare/gpt-5-5-vs-muse-spark-1-1)
- [Muse Spark 1.3 vs Muse Spark 1.1](/compare/muse-spark-1-1-vs-muse-spark-1-3)

## Explore More

- [GPT-5.5 profile](/models/gpt-5-5)
- [Muse Spark 1.3 profile](/models/muse-spark-1-3)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)