Opus 5 seemed to perform better at coding than in my short experience with prior versions. That said I cannot really compare them, as I only used them a couple of times. Last weeks I have been using mostly gpt-5.6 sol and fable. They have been helping me with my masters thesis debugging/refactoring code. I managed to have a few sessions with fable without the safeguards triggering (bc cybersecurity project). So, my overall experience was better with gpt-5.6, also because fable noticed that the changes proposed by gpt were actually better than the ones from fable itself. I paid claude max subscription this month.