Possibly Codex, but I've only used Claude Code so far.

Worth pointing out I'm not SSHing to a different device. Claude Code installed and running directly in Android terminal on my phone.

I've built ASP.NET Core APIs on-device this way. Install dotnet in the terminal and Claude can write code, build, run unit tests, and even run the API on localhost. Then use `git` and `gh` to commit, push and raise a PR.