GPT-5.3-Codex vs Muse Spark 1.3

GPT-5.3-Codex against Muse Spark 1.3
GPT-5.3-CodexMuse Spark 1.3
Coding index60.057.4
Benchmarks behind it Verified, 3 benchmarks Verified, 4 benchmarks
Output $/Mtok$14.00$4.25
Cost per solved task$0.59Not computable
Context window400K1.05M