Compare / Claude Opus 4.5 vs Claude Opus 5
Claude Opus 4.5 vs Claude Opus 5
10 results from 2 sources that measured both models. Each row is in the source's own units; there is no overall winner.
| Benchmark | Metric | Claude Opus 4.5 | Claude Opus 5 |
|---|---|---|---|
| Arena (formerly LMArena)reported | OverallArena rating | 1,465 | 1,490 |
| Arena (formerly LMArena)reported | OverallArena rating | 1,459 | 1,488 |
| Arena (formerly LMArena)reported | Business, management and financeArena rating | 1,472 | 1,486 |
| Arena (formerly LMArena)reported | Creative writingArena rating | 1,469 | 1,472 |
| Arena (formerly LMArena)reported | Expert promptsArena rating | 1,503 | 1,543 |
| Arena (formerly LMArena)reported | Instruction followingArena rating | 1,483 | 1,497 |
| Arena (formerly LMArena)reported | OverallArena rating | 1,474 | 1,491 |
| Arena (formerly LMArena)reported | Writing, literature and languageArena rating | 1,467 | 1,482 |
| tau2-benchreported | Consistency (pass^4)% of tasks | 11.3% | 32.0% |
| tau2-benchreported | Task success (pass^1)% of tasks | 24.7% | 48.7% |
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.