GPT-5.5 vs Grok 4.7

GPT-5.5 against Grok 4.7
GPT-5.5Grok 4.7
Coding index71.366.7
Benchmarks behind it Verified, 5 benchmarks Verified, 5 benchmarks
Output $/Mtok$30.00$6.00
Cost per solved task$1.65Not computable
Context window1.05M500K