GPT-5.5 Pro vs Muse Spark 1.3
GPT-5.5 Pro 
Muse Spark 1.3 Verdict
- Muse Spark 1.3 (max) leads on quality: 69.3 vs 67.1.
- GPT-5.5 Pro (xhigh) is stronger in maths.
- Muse Spark 1.3 (max) is stronger in reasoning, agents & tools, coding, composite, human preference, knowledge, long context, multimodal.
- Muse Spark 1.3 (max) is 34× cheaper ($2.00 vs $67.50 per 1M blended).
- Muse Spark 1.3 (max) streams 55.7× faster (223 vs 4 tokens per second).
| Metric | GPT-5.5 Pro (xhigh) | Muse Spark 1.3 (max) |
|---|---|---|
| BenchLeader Index | 67.1 | 69.3 |
| Maths score | 74.5 | 69.2 |
| Reasoning score | 80.1 | 83.1 |
| Agents & tools score | – | 71.1 |
| Coding score | – | 66.6 |
| Composite score | – | 90.1 |
| Human preference score | – | 69.8 |
| Knowledge score | – | 76.1 |
| Long context score | – | 68.0 |
| Multimodal score | – | 67.4 |
| Blended price $/M | $67.50 | $2.00 |
| Output speed | 4 tok/s | 223 tok/s |
| Time to first answer | 3.5 s | 34.8 s |
| Context window | 1.1M | 1.0M |
| FrontierMath Tiers 1–3 | 87.7% | – |
| FrontierMath Tier 4 | 78.0% | – |
| LMArena Text | – | 1493 |
| LMArena Hard Prompts | – | 1516 |
| LMArena Coding | – | 1537 |
| LMArena WebDev | – | 1652 |
| LMArena Vision | – | 1315 |
| LMArena Agent | – | 4.2 |
| AA Intelligence Index | – | 48.2 |
| AA-LCR | – | 83.0% |
| AA-Omniscience | – | 25 |
| GPQA Diamond (AA) | – | 93.5% |
| Humanity's Last Exam (AA) | – | 48.7% |
| SciCode (AA) | – | 58.8% |
| IOI | – | 56.6% |
| Terminal-Bench 2.1 (Vals) | – | 79.0% |
| Vals Index | – | 64.5 |
| ARC-AGI-1 | 95.0% | – |
| ARC-AGI-2 | 84.2% | – |
| CritPt | 30.6% | 24.9% |
| GDPval (AA) | – | 60.2% |
| τ²-Bench Banking (AA) | – | 50.5% |
| Code Migration | – | 47.4% |
| Excel Modeling Benchmark | – | 67.4% |
| Finance Agent v2 | – | 60.0% |
| Harvey's Legal Agent Benchmark | – | 23.8% |
| Legal Research Bench | – | 55.3% |
| MysteryMechanism | – | 36.0% |
| Terminal-Bench 4.0 (Vals) | – | 27.8% |
| Terminal-Bench Science | – | 14.3% |
| Vibe Code Bench 1-100 | – | 20.5% |
| Vibe Code Bench v1.1 | – | 85.9% |
| LMArena Maths | – | 1496 |
| LMArena Creative Writing | – | 1453 |
| LMArena Instruction Following | – | 1483 |
| LMArena Multi-turn | – | 1493 |
| LMArena Longer Queries | – | 1506 |
| LMArena Document | – | 1468 |
| LMCA | 53.9% | – |
| DTBench | 96.0% | – |
Data as of 2026-09-19. Best configuration of each model; every score links to its source on the model pages.
GPT-5.5 Pro vs Muse Spark 1.3: questions
- Is GPT-5.5 Pro better than Muse Spark 1.3?
- Muse Spark 1.3 (max) leads on quality: 69.3 vs 67.1. The BenchLeader Index combines every independent quality benchmark; Muse Spark 1.3 (max) is ahead overall as of 2026-09-19, but check the category scores for your use.
- Which is cheaper, GPT-5.5 Pro or Muse Spark 1.3?
- Muse Spark 1.3 is cheaper: $2.00 against $67.50 per million tokens, blended at three input tokens per output token.
- Which is faster, GPT-5.5 Pro or Muse Spark 1.3?
- Muse Spark 1.3 streams faster: 223 against 4 output tokens per second.
- Which has the larger context window?
- GPT-5.5 Pro accepts more context: 1.1M against 1.0M tokens.