GPT-6.1 Sol scores 69.4 on the Respan Index (#4), ahead of Kimi K3 at 50.6 (#21). GPT-6.1 Sol leads on 18 of the 22 benchmarks both report. GPT-6.1 Sol is 1.5x cheaper per token at list price. GPT-6.1 Sol has the larger context window (1.1M tokens).
* Estimated: no published scores in that category. How the Respan Index works
| Furniture Assembly (Epoch AI) |
| 80% |
| 34.2% |
| GPQA Diamond | 95.4% | 93.5% |
| LiveBench Agentic Coding (LiveBench) | 56.8% | 62.2% |
| LiveBench Coding (LiveBench) | 80.7% | 81.4% |
| LiveBench Data Analysis (LiveBench) | 82.7% | 78.7% |
| LiveBench Instruction Following (LiveBench) | 74.2% | 71.4% |
| LiveBench Language (LiveBench) | 90.1% | 85.5% |
| LiveBench Mathematics (LiveBench) | 96.8% | 84.4% |
| LiveBench Reasoning (LiveBench) | 92.6% | 90.7% |
| Mystery Game Puzzles (Epoch AI) | 80% | 26% |
| OTIS Mock AIME 2024-2025 (Epoch AI) | 100% | 97.2% |
| SAGE (Vals AI) | 46.5% | 52.8% |
| SimpleQA Verified | 73.9% | 50.6% |
| Terminal-Bench 4.0 (Vals AI) | 55.1% | 17.2% |
| LMArena Agent (LMArena) | 0.1123 | 0.0418 |
| LMArena Elo | 1483 | 1488 |
| LMArena WebDev (LMArena) | 1758 | 1658 |
| SimpleBench (SimpleBench) | 82.9% | 60.7% |
Higher is better. Each score links to where it was published.