Compare / Claude Fable 5 vs Claude Opus 4.5
Claude Fable 5 vs Claude Opus 4.5
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 Fable 5 | Claude Opus 4.5 |
|---|---|---|---|
| Arena (formerly LMArena)reported | OverallArena rating | 1,499 | 1,465 |
| Arena (formerly LMArena)reported | OverallArena rating | 1,229 | 1,187 |
| Arena (formerly LMArena)reported | OverallArena rating | 1,483 | 1,459 |
| Arena (formerly LMArena)reported | Business, management and financeArena rating | 1,503 | 1,472 |
| Arena (formerly LMArena)reported | Creative writingArena rating | 1,501 | 1,469 |
| Arena (formerly LMArena)reported | Expert promptsArena rating | 1,550 | 1,503 |
| Arena (formerly LMArena)reported | Instruction followingArena rating | 1,509 | 1,483 |
| Arena (formerly LMArena)reported | OverallArena rating | 1,504 | 1,474 |
| Arena (formerly LMArena)reported | Writing, literature and languageArena rating | 1,508 | 1,467 |
| OpenHands Indexreported | Average% resolved | 81.0% | 60.6% |
| OpenHands Indexreported | Front end (SWE-Bench Multimodal)% resolved | 70.6% | 41.2% |
| OpenHands Indexreported | Greenfield (Commit0)% resolved | 62.5% | 37.5% |
| OpenHands Indexreported | Information gathering (GAIA)% resolved | 84.2% | 69.1% |
| OpenHands Indexreported | Issue resolution (SWE-Bench)% resolved | 95.8% | 76.6% |
| OpenHands Indexreported | Testing (SWT-Bench)% resolved | 91.9% | 78.5% |
| tau2-benchreported | Consistency (pass^4)% of tasks | 28.9% | 11.3% |
| tau2-benchreported | Task success (pass^1)% of tasks | 39.7% | 24.7% |
| UGI Leaderboardreported | Requested-length error% off the requested word count | 2.0% | 3.0% |
| UGI Leaderboardreported | Style adherencescore from 0 to 1 | 0.41 | 0.39 |
| UGI Leaderboardreported | Writing scorescore out of 100 | 74.2 | 70.4 |
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.