Claude Opus 5 scores 63.9 on the Respan Index (#7), ahead of Muse Spark 1.3 at 54.1 (#13). Claude Opus 5 leads on 13 of the 20 benchmarks both report. Muse Spark 1.3 is 5.0x cheaper per token at list price. Muse Spark 1.3 has the larger context window (1.0M tokens).
* Estimated: no published scores in that category. How the Respan Index works
| LiveBench Agentic Coding (LiveBench) |
| 65.2% |
| 64.1% |
| LiveBench Coding (LiveBench) | 81.4% | 81.1% |
| LiveBench Data Analysis (LiveBench) | 74.6% | 79.6% |
| LiveBench Instruction Following (LiveBench) | 63.8% | 78% |
| LiveBench Language (LiveBench) | 88.7% | 82.8% |
| LiveBench Mathematics (LiveBench) | 95.7% | 95.9% |
| LiveBench Reasoning (LiveBench) | 91.2% | 89.7% |
| Mystery Game Puzzles (Epoch AI) | 59% | 25% |
| OTIS Mock AIME 2024-2025 (Epoch AI) | 98.9% | 99.2% |
| Terminal-Bench 4.0 (Vals AI) | 53.5% | 24.7% |
| LMArena Agent (LMArena) | 0.0867 | 0.04 |
| LMArena Elo | 1490 | 1494 |
| LMArena Vision (LMArena) | 1289 | 1290 |
| LMArena WebDev (LMArena) | 1695 | 1657 |
| GDPval-AA v2 | 1824 | 1754 |
| SimpleBench (SimpleBench) | 80.6% | 81.8% |
Higher is better. Each score links to where it was published.