Claude Opus 5.5 vs Muse Spark 1.3
Claude Opus 5.5 
Muse Spark 1.3 Verdict
- Claude Opus 5.5 (thinking) leads on quality: 70.7 vs 69.2.
- Claude Opus 5.5 (thinking) is stronger in composite, knowledge, long context, multimodal, reasoning.
- Muse Spark 1.3 (max) is stronger in agents & tools, coding, human preference, maths.
- Muse Spark 1.3 (max) is 4.0× cheaper ($2.00 vs $8.00 per 1M blended).
- Muse Spark 1.3 (max) streams 4.4× faster (213 vs 48 tokens per second).
| Metric | Claude Opus 5.5 (thinking) | Muse Spark 1.3 (max) |
|---|---|---|
| BenchLeader Index | 70.7 | 69.2 |
| Composite score | 95.0 | 87.8 |
| Knowledge score | 85.0 | 75.0 |
| Long context score | 68.5 | 67.7 |
| Multimodal score | 71.9 | 67.4 |
| Reasoning score | 95.0 | 81.3 |
| Agents & tools score | – | 71.0 |
| Coding score | – | 67.0 |
| Human preference score | – | 69.8 |
| Maths score | – | 65.9 |
| Blended price $/M | $8.00 | $2.00 |
| Output speed | 48 tok/s | 213 tok/s |
| Time to first answer | 4.2 s | 30.3 s |
| Context window | 1M | 1.0M |
| FrontierMath Tiers 1–3 | – | 74.0% |
| FrontierMath Tier 4 | – | 46.3% |
| SciCode | – | 58.8% |
| LMArena Text | – | 1493 |
| LMArena Hard Prompts | – | 1516 |
| LMArena Coding | – | 1537 |
| LMArena WebDev | – | 1652 |
| LMArena Vision | – | 1315 |
| LMArena Agent | – | 4.2 |
| AA Intelligence Index | 57.6 | 48.1 |
| AA-LCR | 84.7% | 83.0% |
| MMMU-Pro | 87.7% | – |
| AA-Omniscience | 46.4 | 25 |
| GPQA Diamond (AA) | – | 93.5% |
| Humanity's Last Exam (AA) | 61.4% | 48.7% |
| SciCode (AA) | 66.9% | 58.8% |
| IOI | – | 56.6% |
| Terminal-Bench 2.1 (Vals) | – | 79.0% |
| Vals Index | – | 64.5 |
| CritPt | 31.7% | 24.9% |
| GDPval (AA) | 67.3% | 58.7% |
| τ²-Bench Banking (AA) | – | 50.5% |
| Code Migration | – | 47.4% |
| CyberBench | – | 72.7% |
| 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 |
| Chess Puzzles | – | 38.0% |
| Mystery Game Puzzles | – | 25.0% |
| CursorBench | – | 41.6% |
| Terminal-Bench 4.0 (AA) | 59.6% | 33.3% |
| Terminal-Bench 2.1 (AA) | – | 84.3% |
| AutomationBench | 69.5% | 57.9% |
| GDP.pdf | 26.2% | 26.6% |
| MLCR | – | 43.3% |
| Harvey LAB | 91.2% | – |
| AA-Omniscience: accuracy | 66.2% | 43.6% |
| AA-Omniscience: non-hallucination | 41.4% | 67.1% |
| AA-Briefcase | 1822 | 1597 |
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 1.3: questions
- Is Claude Opus 5.5 better than Muse Spark 1.3?
- Claude Opus 5.5 (thinking) leads on quality: 70.7 vs 69.2. 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 1.3?
- Muse Spark 1.3 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 1.3?
- Muse Spark 1.3 streams faster: 213 against 48 output tokens per second.
- Which has the larger context window?
- Muse Spark 1.3 accepts more context: 1.0M against 1M tokens.