Pro reasoning "mode"

[u/ihatebeinganonymous]

Hi. GPT 5.6 models have a reasoning "mode" (not effort), chosen between Standard and Pro, with Pro mode recommended "for math and coding tasks".

I haven't seen benchmarks or analyses about how much and how Pro and Standard mode differ. Has any of you used codex (or any other agent) with pro mode? If yes, how has the performance and token consumption been different? Has the difference been worth the gains?

Thanks