GPT-5.2 vs Grok 4.20

GPT-5.2 against Grok 4.20
GPT-5.2Grok 4.20
Coding index55.933.3
Benchmarks behind it Verified, 3 benchmarks Partial, 2 benchmarks
Output $/Mtok$14.00$2.50
Cost per solved task$1.91$0.72
Context window400K2M