1. Using ChatGPT with a Business Premium seat (not personally paying for it).

2. Also have some API keys for some open weight models in Europe, but currently not using those.

3. I've personally used OpenCode, Claude Code and Codex and of those, I liked Codex the most, till bugs kept on accumulating and they started doing all kinds of shit like that daemon recently. I now switched to https://github.com/capocasa/3code which is a small, simple agent harness but with built-in sandbox, unlike so many other simple harnesses. I really like this one, plus the author is very responsive to feedback

4. No. And I don't think that stuff works in the long run with current quality of code output

5. No.