Compare / Claude Haiku 4.5 vs Mercury 2
Claude Haiku 4.5 vs Mercury 2
9 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 | Mercury 2 |
|---|---|---|---|
| Arena (formerly LMArena)reported | OverallArena rating | 1,418 | 1,368 |
| Arena (formerly LMArena)reported | Business, management and financeArena rating | 1,420 | 1,340 |
| Arena (formerly LMArena)reported | Creative writingArena rating | 1,387 | 1,292 |
| Arena (formerly LMArena)reported | Expert promptsArena rating | 1,452 | 1,348 |
| Arena (formerly LMArena)reported | Instruction followingArena rating | 1,415 | 1,327 |
| Arena (formerly LMArena)reported | OverallArena rating | 1,414 | 1,343 |
| Arena (formerly LMArena)reported | Writing, literature and languageArena rating | 1,399 | 1,307 |
| Vectara Hallucination Leaderboardreported | Answer rate% of documents | 99.5% | 100.0% |
| Vectara Hallucination Leaderboardreported | Hallucination rate% of summaries | 9.8% | 12.3% |
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.