Claude Fable 5.1 vs Muse Spark 1.3
Claude Fable 5.1 (Anthropic) and Muse Spark 1.3 (Meta) compared on price, context window, speed and independent benchmarks. Claude Fable 5.1 scores higher on the Artificial Analysis Intelligence Index (53.4 vs 48.1), while Muse Spark 1.3 is 10.0× cheaper on a blended basis. Pick Claude Fable 5.1 for the hardest tasks and Muse Spark 1.3 when cost dominates.
| Claude Fable 5.1 | Muse Spark 1.3 | |
|---|---|---|
| Provider | Anthropic | Meta |
| Input $/1M | $10.0 | $1.25 |
| Output $/1M | $50.0 | $4.25 |
| Blended $/1M (3:1) | $20.0 | $2.00 |
| Cached input $/1M | $0.25 | $0.15 |
| Context window | 1M | 1.0M |
| Knowledge cutoff | 2026-06 | — |
| License | proprietary | proprietary |
| Speed (tok/s) | 67 | 252 |
| Artificial Analysis Intelligence Index | 53.4 | 48.1 |
| LMArena Elo | 1508 | 1490 |
| GPQA Diamond | 93.7% | 93.5% |
| Humanity's Last Exam | 59.1% | 48.7% |