GPT-5.5 Pro vs Muse Spark 1.1
GPT-5.5 Pro 
Muse Spark 1.1 Verdict
- GPT-5.5 Pro (xhigh) leads on quality: 67.1 vs 65.2.
- GPT-5.5 Pro (xhigh) is stronger in maths, reasoning.
- Muse Spark 1.1 is stronger in agents & tools, coding, human preference, instruction following, knowledge, multimodal.
- Muse Spark 1.1 is 34× cheaper ($2.00 vs $67.50 per 1M blended).
- Muse Spark 1.1 streams 52.5× faster (210 vs 4 tokens per second).
| Metric | GPT-5.5 Pro (xhigh) | Muse Spark 1.1 |
|---|---|---|
| BenchLeader Index | 67.1 | 65.2 |
| Maths score | 74.5 | 62.7 |
| Reasoning score | 80.1 | 69.2 |
| Agents & tools score | – | 62.6 |
| Coding score | – | 68.0 |
| Human preference score | – | 66.2 |
| Instruction following score | – | 77.8 |
| Knowledge score | – | 70.5 |
| Multimodal score | – | 64.8 |
| Blended price $/M | $67.50 | $2.00 |
| Output speed | 4 tok/s | 210 tok/s |
| Time to first answer | 3.5 s | 2.9 s |
| Context window | 1.1M | 1.0M |
| FrontierMath Tiers 1–3 | 87.7% | – |
| FrontierMath Tier 4 | 78.0% | – |
| SimpleQA Verified | – | 57.8% |
| SciCode | – | 58.2% |
| APEX-Agents | – | 41.9% |
| ProofBench | – | 39.0% |
| Epoch Capabilities Index | – | 154.6 |
| LMArena Text | – | 1493 |
| LMArena Hard Prompts | – | 1513 |
| LMArena Coding | – | 1531 |
| LMArena WebDev | – | 1542 |
| LMArena Vision | – | 1294 |
| LMArena Agent | – | -3 |
| SWE-Bench Pro | – | 61.5% |
| MCP Atlas | – | 88.1% |
| MultiChallenge | – | 75.3% |
| PRBench Finance | – | 55.0% |
| PRBench Legal | – | 57.0% |
| MultiNRC | – | 65.6% |
| EQ-Bench 4 | – | 1260 |
| ARC-AGI-1 | 95.0% | – |
| ARC-AGI-2 | 84.2% | – |
| CritPt | 30.6% | – |
| FORTRESS | – | 12.4% |
| SWE-Bench Pro (private) | – | 51.5% |
| VTB | – | 44.8% |
| LMArena Maths | – | 1486 |
| LMArena Creative Writing | – | 1451 |
| LMArena Instruction Following | – | 1471 |
| LMArena Multi-turn | – | 1497 |
| LMArena Longer Queries | – | 1481 |
| LMArena Document | – | 1480 |
| DeepSWE | – | 53.3% |
| LMCA | 53.9% | – |
| DTBench | 96.0% | – |
| GBAEval | – | 7.9% |
| Vending-Bench 2 | – | 6520.5 |
| GDP.pdf | – | 15.0% |
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 1.1: questions
- Is GPT-5.5 Pro better than Muse Spark 1.1?
- GPT-5.5 Pro (xhigh) leads on quality: 67.1 vs 65.2. The BenchLeader Index combines every independent quality benchmark; GPT-5.5 Pro (xhigh) 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 1.1?
- Muse Spark 1.1 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 1.1?
- Muse Spark 1.1 streams faster: 210 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.