a month ago, I asked a bunch of people I know why they switched to codex from Claude code and the tldr was that gpt 5.5 was just smarter
reasons people gave me:
-better able to understand problems and break them down
-“more autistic”
-auto compaction is very good
-oai is giving their team unlimited usage for free to test right now
-ability to use other harnesses (pi, opencode)