Codex just started downloading an update and it's gone. It removed itself.
I guess it's supposed to be a part of ChatGPT now, but I cannot see any update there yet.
btw I kinda hate this, because ChatGPT was always very slow for me - possibly due to amount of historical threads I have there
Ok, I had to re-download Codex from OpenAI's webpage and click update again. Now it's actually different, but I must say it was all a bit confusing.