Some quick and very personal impressions from using Codex more than Claude this week (I will do a full analysis during the weekend hopefully).

(1) While I tried this year to keep Claude and Codex on par, having the same set of plugins/skills and so on, Claude had more skills, as I created skills out of some sessions and not all of them were ported to Codex. Fix for this is simple: Point Codex at the Claude skills folder and ask it to transform them for Claude

(2) When I was in a rush (like debugging something that felt urgent), I still opened Claude as somehow I felt more at home with it. I am not saying it was better, but it was familiar, and when debugging, using tools that I know is important.

(3) Changes created by Codex had fewer comments in Ruby/Ruby on Rails code. I liked that a lot, and I will soon share some experiments I ran on this.

(4) The output of the Codex agent harness is much more “technical” than the one from Claude.…