Claude Opus 5 scores 63.9 on the Respan Index (#7), ahead of Claude Opus 4.8 at 52.2 (#16). Claude Opus 5 leads on 26 of the 29 benchmarks both report. Both cost about the same per token at list price.
* Estimated: no published scores in that category. How the Respan Index works
| 56.1% |
| 73.2% |
| FrontierMath Tiers 1-3 v2 (Epoch AI) | 80% | 85.6% |
| Furniture Assembly (Epoch AI) | 42.5% | 60.8% |
| GPQA Diamond | 93.6% | 93.9% |
| LiveBench Agentic Coding (LiveBench) | 50.5% | 65.2% |
| LiveBench Coding (LiveBench) | 81.8% | 81.4% |
| LiveBench Data Analysis (LiveBench) | 66% | 74.6% |
| LiveBench Instruction Following (LiveBench) | 72% | 63.8% |
| LiveBench Language (LiveBench) | 79.7% | 88.7% |
| LiveBench Mathematics (LiveBench) | 94.3% | 95.7% |
| LiveBench Reasoning (LiveBench) | 89.2% | 91.2% |
| Mystery Game Puzzles (Epoch AI) | 36% | 59% |
| OTIS Mock AIME 2024-2025 (Epoch AI) | 98.3% | 98.9% |
| SAGE (Vals AI) | 54.8% | 49.4% |
| SimpleQA Verified | 53% | 59.9% |
| Terminal-Bench 4.0 (Vals AI) | 23.2% | 53.5% |
| Vending-Bench 2 (Andon Labs) | 5787.43 | 11181.87 |
| WeirdML (Håvard Tveit Ihle) | 82.9% | 91.8% |
| LMArena Agent (LMArena) | 0.0664 | 0.0867 |
| LMArena Elo | 1453 | 1490 |
| LMArena Vision (LMArena) | 1286 | 1289 |
| LMArena WebDev (LMArena) | 1556 | 1695 |
| tau2-bench Banking Knowledge (Sierra) | 39.7% | 48.7% |
| SimpleBench (SimpleBench) | 64.8% | 80.6% |
| Humanity's Last Exam (no tools) | 49.8% | 56.6% |
Higher is better. Each score links to where it was published.