Compare / Claude Opus 5 vs GPT-5.5
Claude Opus 5 vs GPT-5.5
14 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 Opus 5 | GPT-5.5 |
|---|---|---|---|
| Arena (formerly LMArena)reported | Confirmed task successIPS effect estimate | 0.10 | -0.03 |
| Arena (formerly LMArena)reported | Praise over complaintIPS effect estimate | 0.18 | 0.08 |
| Arena (formerly LMArena)reported | SteerabilityIPS effect estimate | 0.11 | 0.07 |
| Arena (formerly LMArena)reported | Tool groundingIPS effect estimate | 0.00 | 0.00 |
| Arena (formerly LMArena)reported | OverallArena rating | 1,490 | 1,483 |
| Arena (formerly LMArena)reported | OverallArena rating | 1,488 | 1,486 |
| Arena (formerly LMArena)reported | Business, management and financeArena rating | 1,486 | 1,489 |
| Arena (formerly LMArena)reported | Creative writingArena rating | 1,472 | 1,452 |
| Arena (formerly LMArena)reported | Expert promptsArena rating | 1,543 | 1,513 |
| Arena (formerly LMArena)reported | Instruction followingArena rating | 1,497 | 1,478 |
| Arena (formerly LMArena)reported | OverallArena rating | 1,491 | 1,481 |
| Arena (formerly LMArena)reported | Writing, literature and languageArena rating | 1,482 | 1,470 |
| tau2-benchreported | Consistency (pass^4)% of tasks | 32.0% | 29.9% |
| tau2-benchreported | Task success (pass^1)% of tasks | 48.7% | 44.6% |
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.