GPT-5.1 vs Muse Spark 1.2

GPT-5.1 against Muse Spark 1.2
GPT-5.1Muse Spark 1.2
Coding index53.365.1
Benchmarks behind it Partial, 2 benchmarks Partial, 2 benchmarks
Output $/Mtok$10.00$4.25
Cost per solved task$1.02$0.64
Context window400K1.05M