Claude Opus 5.5 vs Muse Spark 1.3
Claude Opus 5.5 (Anthropic) and Muse Spark 1.3 (Meta) compared on price, context window, speed and independent benchmarks. Claude Opus 5.5 scores higher on the Artificial Analysis Intelligence Index (57.6 vs 48.1), while Muse Spark 1.3 is 4.0× cheaper on a blended basis. Pick Claude Opus 5.5 for the hardest tasks and Muse Spark 1.3 when cost dominates.
| Claude Opus 5.5 | Muse Spark 1.3 | |
|---|---|---|
| Provider | Anthropic | Meta |
| Input $/1M | $4.00 | $1.25 |
| Output $/1M | $20.0 | $4.25 |
| Blended $/1M (3:1) | $8.00 | $2.00 |
| Cached input $/1M | $0.20 | $0.15 |
| Context window | 1M | 1.0M |
| Knowledge cutoff | 2026-06 | — |
| License | proprietary | proprietary |
| Speed (tok/s) | 85 | 252 |
| Artificial Analysis Intelligence Index | 57.6 | 48.1 |
| LMArena Elo | — | 1490 |
| GPQA Diamond | — | 93.5% |
| Humanity's Last Exam | 61.4% | 48.7% |