I don't see any meaningful performance improvements in those paid models anymore.

They all roughly produce junior developer-level code, continue to have mental breakdowns in their “thinking” stage, occasionally hallucinate things, delete pieces of code/docs they don’t understand or don’t like, use 1.5 times the necessary words to explain things when generating docs and so on.

I'm now testing "avoid sycophancy, keep details short and focus on the facts" in my AGENTS.md files.