As a counter point to this. I have been using opencode for months and it has been stable for me. Also on linux and tried it on alacritty, ghostty and kitty works without a problem in all of them. To me its as good as claude code but i have spent some time tinkering with it and set stuff up the way i like and developed some plugins i needed for it also.
Cool. Thanks for the tip. I gave alacritty a try and that seems to work fine. I'm probably not going to adopt a different terminal program just to use opencode, but at least I can give it a fair evaluation in isolation now. If and when they get it working with Konsole, I may make it a more common part of my workflow.
Still messing around with Codex as well, of course.