Compare / Claude Sonnet 5 vs GPT-5.5
Claude Sonnet 5 vs GPT-5.5
16 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 Sonnet 5 | GPT-5.5 |
|---|---|---|---|
| Arena (formerly LMArena)reported | Confirmed task successIPS effect estimate | 0.01 | -0.03 |
| Arena (formerly LMArena)reported | Praise over complaintIPS effect estimate | 0.09 | 0.08 |
| Arena (formerly LMArena)reported | SteerabilityIPS effect estimate | 0.07 | 0.07 |
| Arena (formerly LMArena)reported | Tool groundingIPS effect estimate | 0.00 | 0.00 |
| Arena (formerly LMArena)reported | OverallArena rating | 1,476 | 1,483 |
| Arena (formerly LMArena)reported | OverallArena rating | 1,196 | 1,224 |
| Arena (formerly LMArena)reported | OverallArena rating | 1,452 | 1,486 |
| Arena (formerly LMArena)reported | Business, management and financeArena rating | 1,465 | 1,489 |
| Arena (formerly LMArena)reported | Creative writingArena rating | 1,435 | 1,452 |
| Arena (formerly LMArena)reported | Expert promptsArena rating | 1,512 | 1,513 |
| Arena (formerly LMArena)reported | Instruction followingArena rating | 1,467 | 1,478 |
| Arena (formerly LMArena)reported | OverallArena rating | 1,462 | 1,481 |
| Arena (formerly LMArena)reported | Writing, literature and languageArena rating | 1,452 | 1,470 |
| UGI Leaderboardreported | Requested-length error% off the requested word count | 3.0% | 13.0% |
| UGI Leaderboardreported | Style adherencescore from 0 to 1 | 0.38 | 0.41 |
| UGI Leaderboardreported | Writing scorescore out of 100 | 62.7 | 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.