GPT-6 Sol scores 62.8 on the Respan Index (#8), ahead of GPT-5.5 at 52.5 (#15). They split the 21 benchmarks both report evenly. GPT-6 Sol is 2.8x cheaper per token at list price. GPT-6 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) |
| 44.2% |
| 58.3% |
| GPQA Diamond | 90.7% | 94.3% |
| LiveBench Agentic Coding (LiveBench) | 54% | 52.9% |
| LiveBench Coding (LiveBench) | 82.1% | 81.8% |
| LiveBench Data Analysis (LiveBench) | 81.6% | 81.2% |
| LiveBench Instruction Following (LiveBench) | 70.7% | 68.6% |
| LiveBench Language (LiveBench) | 87.4% | 85.3% |
| LiveBench Mathematics (LiveBench) | 95.9% | 96.4% |
| LiveBench Reasoning (LiveBench) | 89.7% | 88.7% |
| Mystery Game Puzzles (Epoch AI) | 56% | 56% |
| OTIS Mock AIME 2024-2025 (Epoch AI) | 84.4% | 100% |
| SAGE (Vals AI) | 51.5% | 44.8% |
| SimpleQA Verified | 63% | 60.7% |
| Vending-Bench 2 (Andon Labs) | 7523.84 | 14427.85 |
| LMArena Agent (LMArena) | 0.0415 | 0.0971 |
| LMArena Elo | 1466 | 1457 |
| SimpleBench (SimpleBench) | 69% | 73.1% |
Higher is better. Each score links to where it was published.