Compare / Claude Opus 4.5 vs Claude Opus 4.8
Claude Opus 4.5 vs Claude Opus 4.8
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 Opus 4.5 | Claude Opus 4.8 |
|---|---|---|---|
| Arena (formerly LMArena)reported | OverallArena rating | 1,465 | 1,486 |
| Arena (formerly LMArena)reported | OverallArena rating | 1,187 | 1,195 |
| Arena (formerly LMArena)reported | OverallArena rating | 1,459 | 1,469 |
| Arena (formerly LMArena)reported | Business, management and financeArena rating | 1,472 | 1,490 |
| Arena (formerly LMArena)reported | Creative writingArena rating | 1,469 | 1,467 |
| Arena (formerly LMArena)reported | Expert promptsArena rating | 1,503 | 1,525 |
| Arena (formerly LMArena)reported | Instruction followingArena rating | 1,483 | 1,491 |
| Arena (formerly LMArena)reported | OverallArena rating | 1,474 | 1,480 |
| Arena (formerly LMArena)reported | Writing, literature and languageArena rating | 1,467 | 1,474 |
| OpenHands Indexreported | Average% resolved | 60.6% | 71.9% |
| OpenHands Indexreported | Front end (SWE-Bench Multimodal)% resolved | 41.2% | 50.0% |
| OpenHands Indexreported | Greenfield (Commit0)% resolved | 37.5% | 62.5% |
| OpenHands Indexreported | Information gathering (GAIA)% resolved | 69.1% | 78.8% |
| OpenHands Indexreported | Issue resolution (SWE-Bench)% resolved | 76.6% | 83.8% |
| OpenHands Indexreported | Testing (SWT-Bench)% resolved | 78.5% | 84.3% |
| tau2-benchreported | Consistency (pass^4)% of tasks | 11.3% | 22.7% |
| tau2-benchreported | Task success (pass^1)% of tasks | 24.7% | 39.7% |
| UGI Leaderboardreported | Requested-length error% off the requested word count | 3.0% | 6.0% |
| UGI Leaderboardreported | Style adherencescore from 0 to 1 | 0.39 | 0.40 |
| UGI Leaderboardreported | Writing scorescore out of 100 | 70.4 | 65.9 |
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.