> Just the jump from Sonnet 3.5 to 3.7 to 4.5, and Opus 4.5 has been pretty massive in terms of holistic reasoning, deep knowledge as well as better procedural and architectural adherence.

I don't really agree. Aside from how it handled frontend code, changes in Sonnet did not truly impact my overall productivity (from Sonnet 3.7 to 4 to 4.5, i did not try 3.5). Opus 4.5/Codex 5.2 are when the changes truly happenned for me (and i'm still a bit distrustfull of Codex 5.2, but i use it basically to help me during PRs).