GPT-5.1 scores 32.4 on the Respan Index (#62), ahead of GPT-5.4 mini at 31.2 (#63). They split the 10 benchmarks both report evenly. GPT-5.4 mini is 2.0x cheaper per token at list price.
* Estimated: no published scores in that category. How the Respan Index works
| 43.2% |
| 50.8% |
| SimpleQA Verified | 48% | 29.4% |
| WeirdML (Håvard Tveit Ihle) | 60.8% | 60.3% |
| LMArena Elo | 1423 | 1447 |
| LMArena Vision (LMArena) | 1251 | 1251 |
| LMArena WebDev (LMArena) | 1395 | 1397 |
Higher is better. Each score links to where it was published.