I wanted to see how a bit of API is used, so I had Codex.app create a sample Xcode project and it went off and did exactly what I wanted (which wow, so cool).
Figured it was a good chance to try out Claude to see it was any better. Gave it the same prompt and it too eventually created the test app, but much slower. I tweaked some settings tried again and it went quite a bit faster, but then immediately hit its 5 hour API limit.
Same $20 plan, Codex was just a ton more efficient both time & $.