Regular chat, even on extra high thinking mode, is sort of unlimited. Idk at what point you hit the abuse gaurdrail but its really high whatever it is.
The rest is basically unlimited unless you're doing something very weird.
Meanwhile I cant ask a simple question to Claude, not even to Haiku, because I used my claude code 5h limit.
Prepare to lose essentially unlimited chat mode.
I imagine many will move to claude, as I will (return), unless anthropic makes more blunders.
Random link I found looking for the twitter post
https://pasqualepillitteri.it/en/news/21024/openai-merge-cha...
The only things that OAI still have over A/ are better coding agent GUI, no 5hr limit on >$100, much more reasonable cybersec guardrails (that allow most RE work) and... that's it.