GPT-5.4 Nano vs Grok 4.20

GPT-5.4 Nano against Grok 4.20
GPT-5.4 NanoGrok 4.20
Coding index44.833.3
Benchmarks behind it Partial, 2 benchmarks Partial, 2 benchmarks
Output $/Mtok$1.25$2.50
Cost per solved task$0.14$0.72
Context window400K2M