GPT-5.4 Nano vs Mercury 2.5

GPT-5.4 Nano against Mercury 2.5
GPT-5.4 NanoMercury 2.5
Coding index44.81.6
Benchmarks behind it Partial, 2 benchmarks Partial, 2 benchmarks
Output $/Mtok$1.25$0.15
Cost per solved task$0.14Not computable
Context window400K260K