I haven't used opencode but pi agent runs rings around claude code. Never eats tons of CPU on big outputs, no flickering, open source, tree-based context instead of claude's linear context, easy to toggle collapsing/expanding tool outputs, built for extension with runtime reloading of extensions and skills, etc. You can easily build your own amp-code like handoff mechanism, customize the UI (i see models' edit diffs syntax-highlighted with delta, and just added a keybind to list session-edited files + files from git status in fzf), etc.
Meanwhile with Claude Code I've had to get claude to decompile the editor (extract JS from the bun executable) _twice_ to diagnose weird things like why some documented config flags were not taking effect.
Opus is great - but I'd rather use a different model than be forced back into Claude Code.
