Claude Opus 4.5 vs Muse Spark
Claude Opus 4.5 
Muse Spark Verdict
- Muse Spark leads on quality: 65.6 vs 60.7.
- Claude Opus 4.5 (thinking) is stronger in agents & tools, maths.
- Muse Spark is stronger in coding, composite, instruction following, knowledge, long context, multimodal, reasoning, human preference.
| Metric | Claude Opus 4.5 (thinking) | Muse Spark |
|---|---|---|
| BenchLeader Index | 60.7 | 65.6 |
| Agents & tools score | 74.6 | 66.4 |
| Coding score | 56.4 | 66.2 |
| Composite score | 65.8 | 68.6 |
| Instruction following score | 54.8 | 79.7 |
| Knowledge score | 61.0 | 64.6 |
| Long context score | 65.2 | 65.5 |
| Maths score | 64.0 | 56.4 |
| Multimodal score | 58.0 | 65.9 |
| Reasoning score | 58.6 | 70.2 |
| Human preference score | – | 69.3 |
| Blended price $/M | $10.00 | – |
| Output speed | 45 tok/s | – |
| Time to first answer | 17.3 s | – |
| Context window | 200k | 262k |
| 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 | – | 1488 |
| LMArena Hard Prompts | – | 1505 |
| LMArena Coding | – | 1526 |
| LMArena Vision | – | 1306 |
| AA Intelligence Index | 29.1 | 31.3 |
| IFBench | 58.0% | 75.9% |
| AA-LCR | 77.3% | 78.0% |
| MMMU-Pro | 74.0% | 80.5% |
| AA-Omniscience | 14 | 7.2 |
| Terminal-Bench Hard | 47.0% | 45.5% |
| GPQA Diamond (AA) | 86.6% | 88.4% |
| Humanity's Last Exam (AA) | 30.1% | 40.7% |
| τ²-Bench Telecom (AA) | 89.5% | 91.5% |
| AIME (Vals) | 95.4% | 96.9% |
| LiveCodeBench | 83.7% | – |
| MMLU-Pro | 87.3% | 87.3% |
| IOI | 20.3% | – |
| LegalBench | 84.6% | 84.2% |
| CorpFin | 65.1% | 65.1% |
| TaxEval | 74.9% | 77.7% |
| MedQA | 95.9% | – |
| MGSM | 95.2% | – |
| SWE-bench (Vals) | 76.4% | 74.4% |
| GPQA Diamond (Vals) | 85.9% | 89.7% |
| SWE-Bench Pro | – | 55.0% |
| MCP Atlas | – | 82.2% |
| MultiChallenge | 59.0% | 75.5% |
| PRBench Finance | 46.2% | 52.4% |
| PRBench Legal | 44.2% | 52.3% |
| VISTA | 46.4% | – |
| MultiNRC | 48.6% | 59.0% |
| TutorBench | 51.2% | 68.5% |
| Kagi LLM Benchmark | 80.2% | – |
| ARC-AGI-1 | 80.0% | – |
| ARC-AGI-2 | 37.6% | – |
Data as of 2026-09-10. Best configuration of each model; every score links to its source on the model pages.
Claude Opus 4.5 vs Muse Spark: questions
- Is Claude Opus 4.5 better than Muse Spark?
- Muse Spark leads on quality: 65.6 vs 60.7. The BenchLeader Index combines every independent quality benchmark; Muse Spark is ahead overall as of 2026-09-10, but check the category scores for your use.
- Is Claude Opus 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).
- Is Claude Opus 4.5 better than Muse Spark for agentic tasks?
- Claude Opus 4.5 scores higher in agentic tasks (75 vs 66 on the category index, where 50 is average).
- Which has the larger context window?
- Muse Spark accepts more context: 262k against 200k tokens.