[Feature Request] Add model selection option to specify preferred model for code generation tasks

Question

**Bug Description**
now a lot of code was implemented by opus in my repository, when i, for sure, would never have asked opus, codex 5.5 is far superior in rust implementation at the moment, i just wanted to see if the new model worth me to keep paying 200 usd or if i should freeze this subscription to reactivate if and when you guys get back at track, i think this ipo thing is making what it does to any other greed person/corporation, and i dont think i need to describe or give any example of w