GPT-5.3-Codex xhigh doesnt work in Codex App
Resolved 💬 4 comments Opened Feb 11, 2026 by 4wl2d Closed May 3, 2026
💡 Likely answer: A maintainer (etraut-openai, contributor)
responded on this thread — see the highlighted reply below.
It doesn't work.
<img width="442" height="589" alt="Image" src="https://github.com/user-attachments/assets/20fadb55-26af-4dda-b749-d5cfdbc9da5a" />
<img width="443" height="347" alt="Image" src="https://github.com/user-attachments/assets/e3af5956-cbf6-4aea-8e5e-b864c0b9d138" />
log: 019c4bfb-22ee-7b41-90ce-090fa131e5ec
4 Comments
Same as #7900 ?
I deleted .codex/ and reinstalled Codex, and then it worked～～～
By any chance, do you have
model_supports_reasoning_summaries = falsein your config file? See #11797.we can close it now