I can confidently say Codex 5.5 high is much better in going through long code bases (couple of millions of lines of code) vs Claude Fable/Opus which does only what is been told

earth2mars on Hacker News

couple of millions of lines of code

In the thread “Statement on US government directive to suspend access to Fable 5 and Mythos 5”, replying to this comment

Helped: Codex covers edge cases in large code bases.

Got in the way: Claude only does what is told.