Claude Sonnet 5.5 scores 68.5 on the Respan Index (#6), ahead of Grok 4.6 at 51.0 (#19). Claude Sonnet 5.5 leads on 18 of the 23 benchmarks both report. Grok 4.6 is 1.3x cheaper per token at list price. Claude Sonnet 5.5 has the larger context window (1M tokens).
* Estimated: no published scores in that category. How the Respan Index works
| Furniture Assembly (Epoch AI) |
| 75% |
| 40% |
| GPQA Diamond | 95.6% | 94% |
| LiveBench Agentic Coding (LiveBench) | 56.3% | 57% |
| LiveBench Coding (LiveBench) | 91.4% | 76.8% |
| LiveBench Data Analysis (LiveBench) | 78.6% | 73.9% |
| LiveBench Instruction Following (LiveBench) | 70.5% | 71.9% |
| LiveBench Language (LiveBench) | 83.4% | 83.7% |
| LiveBench Mathematics (LiveBench) | 96.7% | 92.6% |
| LiveBench Reasoning (LiveBench) | 91.6% | 90.5% |
| Mystery Game Puzzles (Epoch AI) | 65% | 34% |
| OTIS Mock AIME 2024-2025 (Epoch AI) | 100% | 99.2% |
| SAGE (Vals AI) | 51.8% | 28.9% |
| SimpleQA Verified | 46.5% | 49.3% |
| Terminal-Bench 4.0 (Vals AI) | 64.1% | 17.2% |
| LMArena Agent (LMArena) | 0.1252 | 0.0128 |
| LMArena Elo | 1471 | 1454 |
| LMArena Vision (LMArena) | 1268 | 1264 |
| LMArena WebDev (LMArena) | 1786 | 1620 |
| SimpleBench (SimpleBench) | 75.9% | 75.9% |
Higher is better. Each score links to where it was published.