GPT-5.1 vs Grok 4.6

GPT-5.1 against Grok 4.6
GPT-5.1Grok 4.6
Coding index53.376.4
Benchmarks behind it Partial, 2 benchmarks Partial, 2 benchmarks
Output $/Mtok$10.00$6.00
Cost per solved task$1.02$0.82
Context window400K500K