GPT-5.6 Sol vs Muse Spark 1.3
GPT-5.6 Sol (OpenAI) and Muse Spark 1.3 (Meta) compared on price, context window, speed and independent benchmarks. GPT-5.6 Sol scores higher on the Artificial Analysis Intelligence Index (60.9 vs 60.8), while Muse Spark 1.3 is 4.0× cheaper on a blended basis. Pick GPT-5.6 Sol for the hardest tasks and Muse Spark 1.3 when cost dominates.
| GPT-5.6 Sol | Muse Spark 1.3 | |
|---|---|---|
| Provider | OpenAI | Meta |
| Input $/1M | $4.00 | $1.25 |
| Output $/1M | $20.0 | $4.25 |
| Blended $/1M (3:1) | $8.00 | $2.00 |
| Cached input $/1M | $0.40 | $0.15 |
| Context window | 1.1M | 1.0M |
| Knowledge cutoff | 2026-02 | — |
| License | proprietary | proprietary |
| Speed (tok/s) | 81 | 115 |
| Artificial Analysis Intelligence Index | 60.9 | 60.8 |
| LMArena Elo | 1455 | — |
| GPQA Diamond | 94.1% | 94.1% |
| Humanity's Last Exam | 49.5% | 47.5% |