Compare / Claude Sonnet 4.5 vs o3
Claude Sonnet 4.5 vs o3
19 results from 3 sources that measured both models. Each row is in the source's own units; there is no overall winner.
| Benchmark | Metric | Claude Sonnet 4.5 | o3 |
|---|---|---|---|
| Arena (formerly LMArena)reported | OverallArena rating | 1,175 | 1,192 |
| Arena (formerly LMArena)reported | OverallArena rating | 1,449 | 1,405 |
| Arena (formerly LMArena)reported | Business, management and financeArena rating | 1,461 | 1,426 |
| Arena (formerly LMArena)reported | Creative writingArena rating | 1,454 | 1,383 |
| Arena (formerly LMArena)reported | Expert promptsArena rating | 1,498 | 1,449 |
| Arena (formerly LMArena)reported | Instruction followingArena rating | 1,464 | 1,403 |
| Arena (formerly LMArena)reported | OverallArena rating | 1,457 | 1,432 |
| Arena (formerly LMArena)reported | Writing, literature and languageArena rating | 1,454 | 1,396 |
| Berkeley Function Calling Leaderboard (BFCL) V4reported | Irrelevance detection% correct | 95.0% | 86.1% |
| Berkeley Function Calling Leaderboard (BFCL) V4reported | Memory% correct | 65.0% | 51.8% |
| Berkeley Function Calling Leaderboard (BFCL) V4reported | Multi-turn tasks% correct | 61.4% | 62.2% |
| Berkeley Function Calling Leaderboard (BFCL) V4reported | Overall accuracy% correct | 73.2% | 63.0% |
| Berkeley Function Calling Leaderboard (BFCL) V4reported | Relevance detection% correct | 68.8% | 93.8% |
| Berkeley Function Calling Leaderboard (BFCL) V4reported | Single-turn calls (curated)% correct | 88.7% | 81.9% |
| Berkeley Function Calling Leaderboard (BFCL) V4reported | Single-turn calls (user-contributed)% correct | 81.1% | 73.2% |
| Berkeley Function Calling Leaderboard (BFCL) V4reported | Web search% correct | 81.0% | 77.0% |
| UGI Leaderboardreported | Requested-length error% off the requested word count | 5.0% | 18.0% |
| UGI Leaderboardreported | Style adherencescore from 0 to 1 | 0.41 | 0.30 |
| UGI Leaderboardreported | Writing scorescore out of 100 | 66.9 | 66.8 |
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.