Which Gpt model and reasoning level did you use in Codex and Amp?

Generally I have noticed Gpt 5.2 codex is slower compared to Sonnet 4.5 in Claude Code.

Amp doesn't have a conventional model selector - you choose fast vs smart (I think that's what it is called).

In smart mode it explores with Gemini Flash and writes with Opus.

Opus is roughly the same speed as Codex, depending on thinking settings.