Compare / Claude Sonnet 4.5 vs Gemini 3.1 Pro Preview
Claude Sonnet 4.5 vs Gemini 3.1 Pro Preview
20 results from 4 sources that measured both models. Each row is in the source's own units; there is no overall winner.
| Benchmark | Metric | Claude Sonnet 4.5 | Gemini 3.1 Pro Preview |
|---|---|---|---|
| Arena (formerly LMArena)reported | OverallArena rating | 1,449 | 1,459 |
| Arena (formerly LMArena)reported | OverallArena rating | 1,175 | 1,208 |
| Arena (formerly LMArena)reported | OverallArena rating | 1,449 | 1,472 |
| Arena (formerly LMArena)reported | Business, management and financeArena rating | 1,461 | 1,477 |
| Arena (formerly LMArena)reported | Creative writingArena rating | 1,454 | 1,480 |
| Arena (formerly LMArena)reported | Expert promptsArena rating | 1,498 | 1,509 |
| Arena (formerly LMArena)reported | Instruction followingArena rating | 1,464 | 1,479 |
| Arena (formerly LMArena)reported | OverallArena rating | 1,457 | 1,487 |
| Arena (formerly LMArena)reported | Writing, literature and languageArena rating | 1,454 | 1,480 |
| OpenHands Indexreported | Average% resolved | 53.0% | 60.6% |
| OpenHands Indexreported | Front end (SWE-Bench Multimodal)% resolved | 36.8% | 44.1% |
| OpenHands Indexreported | Greenfield (Commit0)% resolved | 12.5% | 25.0% |
| OpenHands Indexreported | Information gathering (GAIA)% resolved | 72.7% | 81.8% |
| OpenHands Indexreported | Issue resolution (SWE-Bench)% resolved | 74.2% | 76.8% |
| OpenHands Indexreported | Testing (SWT-Bench)% resolved | 68.8% | 75.1% |
| UGI Leaderboardreported | Requested-length error% off the requested word count | 5.0% | 19.0% |
| UGI Leaderboardreported | Style adherencescore from 0 to 1 | 0.41 | 0.34 |
| UGI Leaderboardreported | Writing scorescore out of 100 | 66.9 | 72.2 |
| Vectara Hallucination Leaderboardreported | Answer rate% of documents | 95.6% | 99.4% |
| Vectara Hallucination Leaderboardreported | Hallucination rate% of summaries | 12.0% | 10.4% |
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.