GPT-5.1 vs Muse Spark 1.3

GPT-5.1 against Muse Spark 1.3
GPT-5.1Muse Spark 1.3
Coding index53.379.7
Benchmarks behind it Partial, 2 benchmarks Partial, 2 benchmarks
Output $/Mtok$10.00$4.25
Cost per solved task$1.02Not computable
Context window400K1.05M