Best indeed to plant your autos in their final resting place. 5gal works great!
for the story, one of my mazar that’s finishing was started in a 3 gallon pot, cause why not right?
ended up having to move her to a #7 airpot halfway thru flower she was getting so rootbound. Like having to water her every 12 hrs! I was super careful not to disturb her roots at all, pop her out, pop her back in, and she did not skip a beat, at all!