Compare / gemini-2.5-flash-preview-09-2025 vs GPT-5.5
gemini-2.5-flash-preview-09-2025 vs GPT-5.5
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 | gemini-2.5-flash-preview-09-2025 | GPT-5.5 |
|---|---|---|---|
| Arena (formerly LMArena)reported | OverallArena rating | 1,425 | 1,486 |
| Arena (formerly LMArena)reported | Business, management and financeArena rating | 1,403 | 1,489 |
| Arena (formerly LMArena)reported | Creative writingArena rating | 1,380 | 1,452 |
| Arena (formerly LMArena)reported | Expert promptsArena rating | 1,432 | 1,513 |
| Arena (formerly LMArena)reported | Instruction followingArena rating | 1,400 | 1,478 |
| Arena (formerly LMArena)reported | OverallArena rating | 1,403 | 1,481 |
| Arena (formerly LMArena)reported | Writing, literature and languageArena rating | 1,394 | 1,470 |
| UGI Leaderboardreported | Requested-length error% off the requested word count | 20.0% | 13.0% |
| UGI Leaderboardreported | Style adherencescore from 0 to 1 | 0.34 | 0.41 |
| UGI Leaderboardreported | Writing scorescore out of 100 | 44.9 | 69.7 |
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.