> it because anthropic doesn't allow other harnesses.
You're not able to use the API credit and hook it up to another harness?
https://platform.claude.com/docs/en/about-claude/api-credits...
API credits yes, subscription no. And the subscription is much better value (per token).
Pi definitely has extensions which allow it. I googled "use Pi with Claude Pro" or something and Gemini was more than happy to point me at the extension.
You can PAYG. But it costs an arm and a leg, compared to the subscriptions. Why? Because they're propping up the "moat" that is Claude Code.