Which AI models are we using?

which AI models are we using? I'm using Claude Code Opus 5.5 (medium) for most things. I haven't experimented outside of this too much mostly because I hate the back and forth prompts and have found I have to do less of that when its at this model. Tried a couple of projects at Sonnet or ChatGPT and found it to be more laborious. True facts, I'm not a good prompter though. What about you? Curious what others are using and experimenting with.