For one reason or another everyone seems to be sleeping on Gemini. I have been exclusively using Gemini 3 Flash to code these days and it stands up right alongside Opus and others while having a much smaller, faster and cheaper footprint. Combine it with Antigravity and you're basically using a cheat code.
I think Gemini is an excellent model, it's just not a particularly great agent. One of the reasons is that its code output is often structured in a way that looks like it's answering a question, rather than generating production code. It leaves comments everywhere, which are often numbered (which not only is annoying, but also only makes sense if the numbering starts within the frame of reference of the "question" it…
Codex is the best at following instructions IME. Claude is pretty good too but is a little more "creative" than codex at trying to re-interpret my prompt to get at what I "probably" meant rather than what I actually said.