Compare / Claude Fable 5 vs GPT-5.5
Claude Fable 5 vs GPT-5.5
24 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 | GPT-5.5 |
|---|---|---|---|
| Arena (formerly LMArena)reported | Confirmed task successIPS effect estimate | 0.03 | -0.03 |
| Arena (formerly LMArena)reported | Praise over complaintIPS effect estimate | 0.17 | 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 | 1,499 | 1,483 |
| Arena (formerly LMArena)reported | OverallArena rating | 1,229 | 1,224 |
| Arena (formerly LMArena)reported | OverallArena rating | 1,483 | 1,486 |
| Arena (formerly LMArena)reported | Business, management and financeArena rating | 1,503 | 1,489 |
| Arena (formerly LMArena)reported | Creative writingArena rating | 1,501 | 1,452 |
| Arena (formerly LMArena)reported | Expert promptsArena rating | 1,550 | 1,513 |
| Arena (formerly LMArena)reported | Instruction followingArena rating | 1,509 | 1,478 |
| Arena (formerly LMArena)reported | OverallArena rating | 1,504 | 1,481 |
| Arena (formerly LMArena)reported | Writing, literature and languageArena rating | 1,508 | 1,470 |
| OpenHands Indexreported | Average% resolved | 81.0% | 65.9% |
| OpenHands Indexreported | Front end (SWE-Bench Multimodal)% resolved | 70.6% | 38.2% |
| OpenHands Indexreported | Greenfield (Commit0)% resolved | 62.5% | 43.8% |
| OpenHands Indexreported | Information gathering (GAIA)% resolved | 84.2% | 86.1% |
| OpenHands Indexreported | Issue resolution (SWE-Bench)% resolved | 95.8% | 78.2% |
| OpenHands Indexreported | Testing (SWT-Bench)% resolved | 91.9% | 83.4% |
| tau2-benchreported | Consistency (pass^4)% of tasks | 28.9% | 29.9% |
| tau2-benchreported | Task success (pass^1)% of tasks | 39.7% | 44.6% |
| UGI Leaderboardreported | Requested-length error% off the requested word count | 2.0% | 13.0% |
| UGI Leaderboardreported | Style adherencescore from 0 to 1 | 0.41 | 0.41 |
| UGI Leaderboardreported | Writing scorescore out of 100 | 74.2 | 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.