They never nerfed any model after release.

The lackluster GPT-6 Sol has been superseded by this apparently much better 6.1 Sol within a week.

I am very skeptical of claims that old models weren't much worse. Compare this to February's GPT-5.3.

I am comparing to GPT-5.3 and 5.2, and I perceive that things have not been noticeably better since then. I also know that I can predict new model releases with high accuracy when my coding agent suddenly becomes regard-level at following instructions and completing simple tasks. This is how I knew 6.0 was about to be released - 5.6 suddenly got unusably bad.

I could point out that I said 6.0 seemed good only in comparison to nerfed 5.6 - people would say I’m just a RSI denialist - but now it is in vogue to accept that 6.0 sucked now that 6.1 is out.