GPT-5.6 Luna vs Grok 4.5

GPT-5.6 Luna against Grok 4.5
GPT-5.6 LunaGrok 4.5
Coding index61.575.5
Benchmarks behind it Partial, 2 benchmarks Partial, 2 benchmarks
Output $/Mtok$1.20$6.00
Cost per solved task$0.04$0.62
Context window1.05M500K