Compare / Claude Opus 5.5 vs Muse Spark 1.2
Claude Opus 5.5 vs Muse Spark 1.2
18 results from 5 sources that measured both models. Each row is in the source's own units; there is no overall winner.
| Benchmark | Metric | Claude Opus 5.5 | Muse Spark 1.2 |
|---|---|---|---|
| APEX-Agentsreported | Tasks passed% of tasks | 73.5% | 36.4% |
| Arena (formerly LMArena)reported | Confirmed task successIPS effect estimate | 0.16 | -0.05 |
| Arena (formerly LMArena)reported | Praise over complaintIPS effect estimate | 0.19 | -0.12 |
| Arena (formerly LMArena)reported | SteerabilityIPS effect estimate | 0.14 | -0.05 |
| Arena (formerly LMArena)reported | Tool groundingIPS effect estimate | 0.00 | 0.00 |
| Arena (formerly LMArena)reported | Business, management and financeArena rating | 1,499 | 1,519 |
| Arena (formerly LMArena)reported | Creative writingArena rating | 1,521 | 1,448 |
| Arena (formerly LMArena)reported | Expert promptsArena rating | 1,556 | 1,502 |
| Arena (formerly LMArena)reported | Instruction followingArena rating | 1,516 | 1,475 |
| Arena (formerly LMArena)reported | OverallArena rating | 1,509 | 1,496 |
| Arena (formerly LMArena)reported | Writing, literature and languageArena rating | 1,520 | 1,472 |
| Artificial Analysisreported | Artificial Analysis Intelligence Indexindex score | 57.6 | 39.6 |
| Artificial Analysisreported | Humanity's Last Exam% of questions | 61.4% | 45.5% |
| Artificial Analysisreported | Long-context reasoning (AA-LCR)% of questions | 84.7% | 79.0% |
| Artificial Analysisreported | SciCode% of problems | 66.9% | 57.4% |
| Artificial Analysisreported | Terminal-Bench 4.0% of tasks | 59.6% | 7.1% |
| GDP.pdfreported | Professional document tasks% of rubric | 30.6% | 16.0% |
| SimpleQA Verified (Epoch AI)reported | Correct answers% of questions | 72.2% | 60.3% |
Bold green marks the better value on that metric. Where a source reports ranges that overlap, the difference may not be meaningful; see the benchmark page for ranges.