Compare / Claude Opus 4.1 vs Gemini 2.5 Pro
Claude Opus 4.1 vs Gemini 2.5 Pro
13 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 | Gemini 2.5 Pro |
|---|---|---|---|
| Arena (formerly LMArena)reported | OverallArena rating | 1,167 | 1,142 |
| Arena (formerly LMArena)reported | OverallArena rating | 1,435 | 1,462 |
| Arena (formerly LMArena)reported | Business, management and financeArena rating | 1,447 | 1,437 |
| Arena (formerly LMArena)reported | Creative writingArena rating | 1,445 | 1,443 |
| Arena (formerly LMArena)reported | Expert promptsArena rating | 1,482 | 1,458 |
| Arena (formerly LMArena)reported | Instruction followingArena rating | 1,458 | 1,438 |
| Arena (formerly LMArena)reported | OverallArena rating | 1,450 | 1,446 |
| Arena (formerly LMArena)reported | Writing, literature and languageArena rating | 1,446 | 1,445 |
| UGI Leaderboardreported | Requested-length error% off the requested word count | 3.0% | 19.0% |
| UGI Leaderboardreported | Style adherencescore from 0 to 1 | 0.38 | 0.40 |
| UGI Leaderboardreported | Writing scorescore out of 100 | 69.9 | 65.2 |
| Vectara Hallucination Leaderboardreported | Answer rate% of documents | 92.4% | 99.1% |
| Vectara Hallucination Leaderboardreported | Hallucination rate% of summaries | 11.8% | 7.0% |
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.