GPT-5.6 Sol vs Grok 4.20

GPT-5.6 Sol against Grok 4.20
GPT-5.6 SolGrok 4.20
Coding index73.533.3
Benchmarks behind it Verified, 6 benchmarks Partial, 2 benchmarks
Output $/Mtok$20.00$2.50
Cost per solved task$1.20$0.72
Context window1.05M2M