"Training the specific harness" is marginal -- it's obvious if you've used anything else. pi with Claude is as good as (even better! given the obvious care to context management in pi) as Claude Code with Claude.

This whole game is a bizarre battle.

In the future, many companies will have slightly different secret RL sauces. I'd want to use Gemini for documentation, Claude for design, Codex for planning, yada yada ... there will be no generalist take-all model, I just don't believe RL scaling works like that.

I'm not convinced that a single company can own the best performing model in all categories, I'm not even sure the economics make it feasible.

Good for us, of course.