Not the OP but I use AI all day every day and have noticed substantial improvements in the models over the past ~6 months. GPT-5 was a huge leap (contrary to reporting) and so was Sonnet 4.5.

GPT5 was by no means a huge leap. I’d be willing to believe that you prefer it, or that you found it an improvement, despite both of those being wildly contrary to my experience (and most of the rhetoric online). But objectively speaking it was a small improvement, even going by OpenAI’s marketing claims.

In practice, I upgraded everything to GPT-5 and the performance was so terrible I had to rollback the update.

> GPT-5 was a huge leap (contrary to reporting) and

Depends on what you compare it to. For us who were using o3/o1 Pro Mode before GPT-5, the new model isn't that huge of a leap, compared to whatever was before Pro Mode existed.