Claude Opus 5.5 vs Muse Spark
| Spec | Claude Opus 5.5 | Muse Spark |
|---|---|---|
| Respan Index | 74.1 (#1) | 34.7 (#72) |
| Blended price per 1M | $4 | - |
| Context window | 1M | - |
| Input / output per 1M | $2 / $10 | - |
| Max output | 128K | - |
| Input | text, vision | text, vision |
| Released | 2026-09-22 | 2026-04-08 |
Respan Index by category
Each category is scored 0 to 100, and how far ahead the winner is. Leads under a point are close to even.
| Category | Claude Opus 5.5 | Muse Spark |
|---|---|---|
| Coding | 68.3 Claude Opus 5.5 | 14.0 Muse Spark |
| Agents | 79.1 Claude Opus 5.5 | 39.9* Muse Spark |
| Reasoning | 83.9 Claude Opus 5.5 | 36.4 Muse Spark |
| Knowledge & language | 70.4 Claude Opus 5.5 | 33.6* Muse Spark |
| Human preference | 61.4 Claude Opus 5.5 | 58.1 Muse Spark |
* Estimated: no published scores in that category. How the Respan Index works
Benchmarks both report
Claude Opus 5.5 leads on 4 of the 5 benchmarks both report. Higher is better. Each score links to where it was published.
FAQ
Is Claude Opus 5.5 better than Muse Spark?
Claude Opus 5.5 scores 74.1 on the Respan Index (#1), ahead of Muse Spark at 34.7 (#72). Claude Opus 5.5 leads on 4 of the 5 benchmarks both report.