I just tried this out, and was VERY impressed with the speed of the plan mode. I was also totally fine with the code it wrote.

Then I made the mistake of saying "run npm run build and fix all issues" (something I've run probably 50 times across codex and cc in the past 2 months). CC does it pretty much 100% of the time. I walked away from Codex, and when I came back, it had installed 2 new node packages, and gone down some crazy rabbit hole with eslint and something else. (this was for 2 minor typescript errors)

After I reverted all its changes, had CC do it and it fixed it in about 30-60 seconds.

I'll try a few more times. Let's see.