Compare / GPT-5.5 vs gpt-oss-20b
GPT-5.5 vs gpt-oss-20b
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 | GPT-5.5 | gpt-oss-20b |
|---|---|---|---|
| Arena (formerly LMArena)reported | Business, management and financeArena rating | 1,489 | 1,323 |
| Arena (formerly LMArena)reported | Creative writingArena rating | 1,452 | 1,240 |
| Arena (formerly LMArena)reported | Expert promptsArena rating | 1,513 | 1,314 |
| Arena (formerly LMArena)reported | Instruction followingArena rating | 1,478 | 1,281 |
| Arena (formerly LMArena)reported | OverallArena rating | 1,481 | 1,318 |
| Arena (formerly LMArena)reported | Writing, literature and languageArena rating | 1,470 | 1,275 |
| UGI Leaderboardreported | Requested-length error% off the requested word count | 13.0% | 98.0% |
| UGI Leaderboardreported | Style adherencescore from 0 to 1 | 0.41 | 0.31 |
| UGI Leaderboardreported | Writing scorescore out of 100 | 69.7 | 24.6 |
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.