They should just roll back to the preview versions. Those were so much more even keeled and actually did some useful pushback instead of this cheerleader-on-steroids version they GA'd.
Yes I was very surprised after the whole "scandal" around ChatGPT becoming too sycophantic that there was this massive change in tone from the last preview model (05-06) to the 06-05/GA model. The tone is really off-putting, I really liked how the preview versions felt like intelligent conversation partners and recognize what you're saying about useful pushback - it was my favorite set of models (the few preview iterations before this one) and I'm sad to see them disappearing.
Many people on the Google AI Developer forums have also noted either bugs or just performance regression in the final model.
I don't know but it sure doesn't feel the same. I have been using Gemini 2.5 pro (preview and now GA) for a while. The difference in tone is palpable. I also noticed that the preview took longer time and the GA is faster so it could be quantization.
Maybe a bunch of people with authority to decide thought that it was too slow/expensive/boring and screwed up a nice thing.
Many people on the Google AI Developer forums have also noted either bugs or just performance regression in the final model.