GPT-6 Astra vs Muse Spark 1.3
GPT-6 Astra (OpenAI) and Muse Spark 1.3 (Meta) compared on price, context window, speed and independent benchmarks. GPT-6 Astra scores higher on the Artificial Analysis Intelligence Index (61.2 vs 60.8), while Muse Spark 1.3 is 10.0× cheaper on a blended basis. Pick GPT-6 Astra for the hardest tasks and Muse Spark 1.3 when cost dominates.
| GPT-6 Astra | Muse Spark 1.3 | |
|---|---|---|
| Provider | OpenAI | Meta |
| Input $/1M | $10.0 | $1.25 |
| Output $/1M | $50.0 | $4.25 |
| Blended $/1M (3:1) | $20.0 | $2.00 |
| Cached input $/1M | $1.00 | $0.15 |
| Context window | 1.1M | 1.0M |
| Knowledge cutoff | 2026-04 | — |
| License | proprietary | proprietary |
| Speed (tok/s) | — | 115 |
| Artificial Analysis Intelligence Index | 61.2 | 60.8 |
| GPQA Diamond | 96.1% | 94.1% |
| Humanity's Last Exam | 54.7% | 47.5% |