Compare / Claude Opus 4.1 vs Claude Sonnet 5
Claude Opus 4.1 vs Claude Sonnet 5
15 results from 3 sources that measured both models. Each row is in the source's own units; there is no overall winner.
| Benchmark | Metric | Claude Opus 4.1 | Claude Sonnet 5 |
|---|---|---|---|
| Arena (formerly LMArena)reported | OverallArena rating | 1,167 | 1,196 |
| Arena (formerly LMArena)reported | OverallArena rating | 1,435 | 1,452 |
| Arena (formerly LMArena)reported | Business, management and financeArena rating | 1,447 | 1,465 |
| Arena (formerly LMArena)reported | Creative writingArena rating | 1,445 | 1,435 |
| Arena (formerly LMArena)reported | Expert promptsArena rating | 1,482 | 1,512 |
| Arena (formerly LMArena)reported | Instruction followingArena rating | 1,458 | 1,467 |
| Arena (formerly LMArena)reported | OverallArena rating | 1,450 | 1,462 |
| Arena (formerly LMArena)reported | Writing, literature and languageArena rating | 1,446 | 1,452 |
| Artificial Analysisreported | Artificial Analysis Intelligence Indexindex score | 22.8 | 38.2 |
| Artificial Analysisreported | GPQA Diamond% of questions | 80.9% | 91.1% |
| Artificial Analysisreported | Humanity's Last Exam% of questions | 12.5% | 41.3% |
| Artificial Analysisreported | Long-context reasoning (AA-LCR)% of questions | 76.0% | 82.0% |
| UGI Leaderboardreported | Requested-length error% off the requested word count | 3.0% | 3.0% |
| UGI Leaderboardreported | Style adherencescore from 0 to 1 | 0.38 | 0.38 |
| UGI Leaderboardreported | Writing scorescore out of 100 | 69.9 | 62.7 |
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.