https://help.openai.com/en/articles/11369540-using-codex-wit...

have to say not sure what this even means and what the exact definition of a message is in this context.

with claude code max20 I was constantly hitting limits, with codex not once yet

Same. We're not hitting limits at all with Codex and it's ridiculously good at managing and preserving its context window while getting a metric fuckton of work done. It's kind of unbelievable actually. I don't know re billing. Not my dept.