Claude Opus 5.5 vs Muse Spark 1.1
Claude Opus 5.5 
Muse Spark 1.1 Verdict
- Claude Opus 5.5 (thinking) leads on quality: 70.7 vs 64.8.
- Claude Opus 5.5 (thinking) is stronger in composite, knowledge, long context, multimodal, reasoning.
- Muse Spark 1.1 is stronger in agents & tools, coding, human preference, instruction following, maths.
- Muse Spark 1.1 is 4.0× cheaper ($2.00 vs $8.00 per 1M blended).
- Muse Spark 1.1 streams 4.4× faster (210 vs 48 tokens per second).
| Metric | Claude Opus 5.5 (thinking) | Muse Spark 1.1 |
|---|---|---|
| BenchLeader Index | 70.7 | 64.8 |
| Composite score | 95.0 | – |
| Knowledge score | 85.0 | 70.5 |
| Long context score | 68.5 | – |
| Multimodal score | 71.9 | 64.8 |
| Reasoning score | 95.0 | 69.3 |
| Agents & tools score | – | 60.4 |
| Coding score | – | 67.9 |
| Human preference score | – | 66.2 |
| Instruction following score | – | 77.8 |
| Maths score | – | 62.8 |
| Blended price $/M | $8.00 | $2.00 |
| Output speed | 48 tok/s | 210 tok/s |
| Time to first answer | 4.2 s | 2.9 s |
| Context window | 1M | 1.0M |
| SimpleQA Verified | – | 57.8% |
| SciCode | – | 58.8% |
| ProofBench | – | 39.0% |
| Epoch Capabilities Index | – | 154.3 |
| LMArena Text | – | 1493 |
| LMArena Hard Prompts | – | 1513 |
| LMArena Coding | – | 1531 |
| LMArena WebDev | – | 1542 |
| LMArena Vision | – | 1294 |
| LMArena Agent | – | -3 |
| AA Intelligence Index | 57.6 | – |
| AA-LCR | 84.7% | – |
| MMMU-Pro | 87.7% | – |
| AA-Omniscience | 46.4 | – |
| Humanity's Last Exam (AA) | 61.4% | – |
| SciCode (AA) | 66.9% | – |
| 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 |
| CritPt | 31.7% | – |
| GDPval (AA) | 67.3% | – |
| 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% |
| GBAEval | – | 7.9% |
| Vending-Bench 2 | – | 6520.5 |
| GDP.pdf | – | 15.0% |
| Terminal-Bench 4.0 (AA) | 59.6% | – |
| AutomationBench | 69.5% | – |
| GDP.pdf | 26.2% | – |
| Harvey LAB | 91.2% | – |
| AA-Omniscience: accuracy | 66.2% | – |
| AA-Omniscience: non-hallucination | 41.4% | – |
| AA-Briefcase | 1822 | – |
Data as of 2026-09-22. Best configuration of each model; every score links to its source on the model pages.
Claude Opus 5.5 vs Muse Spark 1.1: questions
- Is Claude Opus 5.5 better than Muse Spark 1.1?
- Claude Opus 5.5 (thinking) leads on quality: 70.7 vs 64.8. The BenchLeader Index combines every independent quality benchmark; Claude Opus 5.5 (thinking) is ahead overall as of 2026-09-22, but check the category scores for your use.
- Which is cheaper, Claude Opus 5.5 or Muse Spark 1.1?
- Muse Spark 1.1 is cheaper: $2.00 against $8.00 per million tokens, blended at three input tokens per output token.
- Which is faster, Claude Opus 5.5 or Muse Spark 1.1?
- Muse Spark 1.1 streams faster: 210 against 48 output tokens per second.
- Which has the larger context window?
- Muse Spark 1.1 accepts more context: 1.0M against 1M tokens.