Grok 4.1 Fast Reasoning scores 21.0 on the Respan Index (#89), ahead of Grok 4 Fast Reasoning at 18.4 (#102). Grok 4.1 Fast Reasoning leads on 3 of the 3 benchmarks both report. Both cost about the same per token at list price.
| Benchmark | Grok 4.1 Fast Reasoning | Grok 4 Fast Reasoning |
|---|---|---|
| SAGE (Vals AI) | 31.3% | 29.8% |
| LMArena Elo | 1430 | 1405 |
| LMArena WebDev (LMArena) | 1241 | 1159 |
Higher is better. Each score links to where it was published.
* Estimated: no published scores in that category. How the Respan Index works