The biggest reason is I don't like being locked into an ecosystem. I can use whatever I want with OpenCode, not so much with Codex and Claude Code. Right now I'm only using GPT with it, but I like the option.

CC I have the least experience with. It just seemed buggy and unpolished to me. Codex was fine, but there was something about it that just didn't feel right. It seemed fined for code tasks but just as often I want to do research or discuss the code base, and for whatever reason I seemed to get terse less useful answers using Codex even when it's backed by the same model.

OpenCode works well, I haven't had any issues with bugs or things breaking, and it just felt comfortable to use right from the jump.