GPT-6 Astra scores 70.5 on the Respan Index (#2), ahead of Step 5 Preview at 54.9 (#12). GPT-6 Astra leads on 5 of the 5 benchmarks both report. Step 5 Preview is 14x cheaper per token at list price. GPT-6 Astra has the larger context window (1.1M tokens).
* Estimated: no published scores in that category. How the Respan Index works
| LMArena WebDev (LMArena) |
| 1788 |
| 1570 |
Higher is better. Each score links to where it was published.