Compare / Claude Haiku 4.5 vs Claude Sonnet 5
Claude Haiku 4.5 vs Claude Sonnet 5
11 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 Haiku 4.5 | Claude Sonnet 5 |
|---|---|---|---|
| Arena (formerly LMArena)reported | OverallArena rating | 1,419 | 1,476 |
| Arena (formerly LMArena)reported | OverallArena rating | 1,418 | 1,452 |
| Arena (formerly LMArena)reported | Business, management and financeArena rating | 1,420 | 1,465 |
| Arena (formerly LMArena)reported | Creative writingArena rating | 1,387 | 1,435 |
| Arena (formerly LMArena)reported | Expert promptsArena rating | 1,452 | 1,512 |
| Arena (formerly LMArena)reported | Instruction followingArena rating | 1,415 | 1,467 |
| Arena (formerly LMArena)reported | OverallArena rating | 1,414 | 1,462 |
| Arena (formerly LMArena)reported | Writing, literature and languageArena rating | 1,399 | 1,452 |
| UGI Leaderboardreported | Requested-length error% off the requested word count | 6.0% | 3.0% |
| UGI Leaderboardreported | Style adherencescore from 0 to 1 | 0.39 | 0.38 |
| UGI Leaderboardreported | Writing scorescore out of 100 | 52.2 | 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.