This is so hard to answer 
I have very detailed projects with rules, architecture docu & prompts etc that work only with models that are adhering to the dot (3.5 Sonnet), any other models gets it totally wrong.
At same time I tried soft-‘vibe’ coding as a dev of over 30 years experience. Basically wrote core principles in my user rules and used Claude 4 Sonnet Thinking MAX and it nailed all the needed things for open tasks.