Claude Sonnet 4.5 vs Muse Spark
Claude Sonnet 4.5 
Muse Spark Verdict
- Muse Spark leads on quality: 65.2 vs 57.9.
- Muse Spark is stronger in coding, human preference, reasoning, agents & tools, instruction following, knowledge, maths, multimodal.
| Metric | Claude Sonnet 4.5 (high) | Muse Spark |
|---|---|---|
| BenchLeader Index | 57.9 | 65.2 |
| Coding score | 56.4 | 66.2 |
| Human preference score | 65.3 | 69.2 |
| Reasoning score | 66.4 | 70.2 |
| Agents & tools score | – | 62.9 |
| Instruction following score | – | 83.8 |
| Knowledge score | – | 63.8 |
| Maths score | – | 56.4 |
| Multimodal score | – | 66.7 |
| Blended price $/M | $6.00 | – |
| Output speed | 40 tok/s | – |
| Time to first answer | 1.2 s | – |
| Context window | 1M | – |
| GPQA Diamond | – | 89.8% |
| OTIS Mock AIME | – | 88.9% |
| Humanity's Last Exam | – | 40.6% |
| SciCode | – | 51.5% |
| ProofBench | – | 17.0% |
| Epoch Capabilities Index | – | 152.1 |
| LMArena Text | 1456 | 1488 |
| LMArena Hard Prompts | 1487 | 1505 |
| LMArena Coding | 1520 | 1526 |
| LMArena WebDev | 1393 | – |
| LMArena Vision | – | 1306 |
| AIME (Vals) | – | 96.9% |
| MMLU-Pro | – | 87.3% |
| LegalBench | – | 84.2% |
| CorpFin | – | 65.1% |
| TaxEval | – | 77.7% |
| SWE-bench (Vals) | – | 74.4% |
| GPQA Diamond (Vals) | – | 89.7% |
| SWE-Bench Pro | – | 55.0% |
| MCP Atlas | – | 82.2% |
| MultiChallenge | – | 75.5% |
| PRBench Finance | – | 52.4% |
| PRBench Legal | – | 52.3% |
| MultiNRC | – | 59.0% |
| TutorBench | – | 68.5% |
| SWE-bench Verified (bash only) | 71.4% | – |
Data as of 2026-09-13. Best configuration of each model; every score links to its source on the model pages.
Claude Sonnet 4.5 vs Muse Spark: questions
- Is Claude Sonnet 4.5 better than Muse Spark?
- Muse Spark leads on quality: 65.2 vs 57.9. The BenchLeader Index combines every independent quality benchmark; Muse Spark is ahead overall as of 2026-09-13, but check the category scores for your use.
- Is Claude Sonnet 4.5 better than Muse Spark for coding?
- Muse Spark scores higher in coding (66 vs 56 on the category index, where 50 is average).