I thought I was an OpenAI fanboy, but version 5.6 isn’t for me. Sol Ultra just keeps working and checking, and working and checking again, but it can’t even correct minor errors that aren’t a problem for 5.5 xhigh. I’ve rolled Codex back to 5.5 for now.
The problem is they nerfed 5.5 about a month ago. The change was immediately visible to me: context compacting started to happen about 3x as frequently.
I think 5.6 is still not even close to 5.5 xhigh pre-nerf.