1: I have the fancy Claude, and then regular paid Codex, Grok, and GLM 5.3

2: Not for development

3: I work inside Claude Code almost all of the time, inside a byre sandbox, often connected to happier. Claude calls out for code reviews to the other models

4: I have a self-built code-review wrapper for Claude to call the other models, but nothing more than that

5: Haven't managed to find anything useful to do with them.