Claude Sonnet 5.5 scores 68.5 on the Respan Index (#6), ahead of Qwen3.8-Flash-Next at 42.7 (#39). Claude Sonnet 5.5 leads on 8 of the 10 benchmarks both report.
* Estimated: no published scores in that category. How the Respan Index works
| LiveBench Instruction Following (LiveBench) |
| 70.5% |
| 77.1% |
| LiveBench Language (LiveBench) | 83.4% | 74.6% |
| LiveBench Mathematics (LiveBench) | 96.7% | 85.8% |
| LiveBench Reasoning (LiveBench) | 91.6% | 87.4% |
| LMArena Agent (LMArena) | 0.1252 | -0.0073 |
| LMArena WebDev (LMArena) | 1786 | 1638 |
Higher is better. Each score links to where it was published.