GPT-6 Astra scores 70.5 on the Respan Index (#2), ahead of Kimi K2.6 at 34.4 (#55). GPT-6 Astra leads on 21 of the 22 benchmarks both report. Kimi K2.6 is 12x 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
| 80% |
| 21.7% |
| GPQA Diamond | 96% | 90.8% |
| LiveBench Agentic Coding (LiveBench) | 57.3% | 46.9% |
| LiveBench Coding (LiveBench) | 80.4% | 78.6% |
| LiveBench Data Analysis (LiveBench) | 83% | 65.1% |
| LiveBench Instruction Following (LiveBench) | 75.6% | 64.4% |
| LiveBench Language (LiveBench) | 89.4% | 75.1% |
| LiveBench Mathematics (LiveBench) | 96.8% | 84.3% |
| LiveBench Reasoning (LiveBench) | 92.7% | 79.4% |
| Mystery Game Puzzles (Epoch AI) | 84% | 18% |
| OTIS Mock AIME 2024-2025 (Epoch AI) | 100% | 96.1% |
| SAGE (Vals AI) | 46.4% | 50.2% |
| SimpleQA Verified | 75.6% | 34.9% |
| Vending-Bench 2 (Andon Labs) | 15514.7 | 6204.57 |
| WeirdML (Håvard Tveit Ihle) | 93.6% | 55.9% |
| LMArena Elo | 1477 | 1455 |
| LMArena Vision (LMArena) | 1284 | 1265 |
| LMArena WebDev (LMArena) | 1788 | 1509 |
Higher is better. Each score links to where it was published.