for me the ones i have used so far, here is how i would say they are best use
4o mini - cheap, used for general task, can also scrape the web - but sometimes it could not be accurate.
4.1 mini - new version of the 4o mini, same use case as it but has better reasoning - notice in some cases it slightly cost more by an inch or sometimes not when using clay credit
4.1 / GPT-5 - for most complex reasoning tasks - does most of the work you want it to do - but very costly
4o mini is usually my go to for everyday task/scrape