I feel like I can't even try this on the Pro plan because Anthropic has conditioned me to understand that even chatting lightly with the Opus model blows up usage and locks me out. So if I would normally use Sonnet 4.5 for a day's worth of work but I wake up and ask Opus a couple of questions, I might as well just forget about doing anything with Claude for the rest of the day lol. But so far I haven't had this issue with ChatGPT. Their 5.2 model (haven't tried 5.3) worked on something for 2 FREAKING HOURS and I still haven't run into any limits. So yeah, Opus is out for me now unfortunately. Hopefully they make the Sonnet model better though!