I have been paying $200 per month for 01-pro mode and I am very disappointed right now because they have completely replaced the model today. It used to think for 1-5 minutes and deliver an unbelievably useful one-shot answer. Now, it only thinks for 7 seconds just like the 03-mini model and I can't tell the difference in the answers. I hope this is just a day 1 implementation bug but I suspect they have just decided to throw the $200 per month customers under the bus so that they'd have more capacity to launch the 03 model for everybody. I can't tell the difference between the models now and it is definitely not because the free 03 model delivers the quality that 01-pro-mode had! I'm so disappointed!
This is why I use the Azure-hosted versions (disclosure: I’m an MS FTE, but I use all sorts of 3rd party models for my own projects) - I _know_ which version is behind each endpoint and when they will be replaced (you can also pin versions within a support window that varies according to model), so I don’t have to rework all my prompts and throw work away at the drop of a hat.
They have been doing this since day 1. I was a subscriber in the first few months (then occasionally every few months to check out the progress) and so many people complained that OpenAI fiddled with the models daily without saying anything to anyone.
It was always attributed to variability but we all know it's not.
