GPT-5.4 vs Grok 4.20

GPT-5.4 against Grok 4.20
GPT-5.4Grok 4.20
Coding index64.433.3
Benchmarks behind it Verified, 3 benchmarks Partial, 2 benchmarks
Output $/Mtok$15.00$2.50
Cost per solved task$1.02$0.72
Context window1.05M2M