Ok, collecting my overall GPT-5 impressions: - Biggest upgrade seems to be 4o -> 5. I rarely use these models but for the median user this is a huge upgrade. - 5-T is sometimes better than o3, sometimes worse. Finding that I often do side by side queries here, which is annoying. o3 seems to search deeper and more thoroughly at times. o3 is also _weirder_ / more of an autist which I like personally. - 5-pro is really really smart, clearly "the smartest model on the market" for complex questions. I need to spend more time testing here, but so far it's produced better results than o3 pro. - I spent a few hours in Cursor/GPT5 last night and was super impressed. The model really flies, the instruction following + tool calling is noticeably better, and it's more reliable overall. You still need to use all the usual AI coding guardrails to get a good result, but it feels roughly as good as Claude Code / Sonnet now in capability terms, and it is actually better at doing more complex UIs / front-end from what I can tell so far. - CC still feels like a better overall product than Codex to me at the moment, but I'm sure they'll catch up. - They seem to have souped up GPT5-T's fiction writing abilities. I got some interesting/novel stuff out of it for the first time, which is new. (Will post an example in the reply tweets). - I find the UX to get to GPT5-T / Pro annoying (a sub-menu? really?) and wish it were just a toggle. Hopefully this is an easy fix. Overall: - Very happy as a Pro user, but I can see why Plus users might complain about the model router. ChatGPT continues to be to be my main go-to for most AI uses. - I don't see the "plateau" point at all and I think people are overreacting too quickly. Plenty of time to expand along the tool-calling/agent frontier, for one thing. (It's easiest to see this when you're coding, perhaps, since that's where the biggest improvement seems to have come.) - I expect OpenAI will do very well out of this release and their numbers will continue to go up. As they should.

The o3/5-T search example I mentioned:

On creative writing, I asked it to do a para about getting a cold brew in Joyce's Finnegans Wake style and was impressed with the below pastiche. For a post-trained model there's a lot more novelty/creativity going on than usual (e.g. "taxicoal black" for coffee was funny).

(Also, all of this is from playing with the model for less than half a day so expect some of these takes to change as I get to know the models better...)

@ChrisSpoke Best, as with most things, is probably just to try for a month and see how it goes