Open harnesses hold up better

I was listening to the OpenCode guy, and he reckons a harness (the program that runs the model and gives it tools) is actually better when you build it to work with a variety of models.

Claude Code over-fits to Claude's own models, so a new model breaks it. An open harness like OpenCode has to work with all sorts of models, and that makes it a better harness because it copes with change.