Claude Sonnet 5.5 scores 68.5 on the Respan Index (#6), ahead of Step 5 Preview at 54.9 (#12). Claude Sonnet 5.5 leads on 5 of the 5 benchmarks both report. Step 5 Preview is 2.8x cheaper per token at list price.
* Estimated: no published scores in that category. How the Respan Index works
| LMArena WebDev (LMArena) |
| 1786 |
| 1570 |
Higher is better. Each score links to where it was published.