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can't change model and reasoning efforts sometimes #17318
Description
What version of the Codex App are you using (From “About Codex” dialog)?
26.406.31014(1395)
What subscription do you have?
Pro
What platform is your computer?
Darwin 25.3.0 arm64 arm
What issue are you seeing?
2026-04-10.5.53.54.mov
unable to set model and reasoning effort sometimes.
Not always happening, the bug is limited to be happened in a few threads, does not occur everywhere.
I think this bug is appeared from 1~2 versions before the current one.
I'm keep seeing this, it disappears after turning off and on but little bit annoying :)
What steps can reproduce the bug?
after a few hours of use, I see this bug, not sure about the repro.
What is the expected behavior?
able to set model and reasoning effort
Additional information
No response
Activity
github-actions commentedon Apr 10, 2026
Potential duplicates detected. Please review them and close your issue if it is a duplicate.
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sairion commentedon Apr 15, 2026
This is still occuring in newest version,
26.409.20454(1462)0xdevalias commentedon Apr 21, 2026
I think I am seeing this in
Version 26.417.41555 (1858)as well, submitted an in-app bug report for it with ID:ef24fb68-7bb0-444c-8190-e45ec2745971d3ming commentedon Apr 22, 2026
Happens to me pretty consistently when I start a new conversation in a particular project, I can't change the model on the initial convo but once I start the session I can change again.
0xdevalias commentedon Apr 23, 2026
That seems to generally be the same for me too.
corrylc commentedon Apr 23, 2026
It appears the UX was rebuilt in26.422.20832 (2025), and changing reasoning/model works for me now.Nevermind, the issue is still present as subsequent folks have found. It just took a bit of time to resurface.
kdawgwilk commentedon Apr 23, 2026
I think it still happens when you have the default model set in a
.codex/config.tomlwhen you are trying to create a new chat in that projectsebkouba commentedon Apr 26, 2026
I'm on Version 26.422.30944 (2080) - no update available, still happens.
AdiRishi commentedon Apr 27, 2026
I’m still seeing this on Codex App Version 26.422.30944 (2080), macOS Darwin 25.3.0 arm64.
In my case, after extended use, the reasoning effort selector can get stuck visually. For example, if it shows High and I select Medium, the dropdown closes but the selector still shows High.
I checked
~/.codex/config.tomlwhile this was happening, and the value there does update correctly when I change it in the app. So the setting is being changed, but the app still displays the old selected value.Closing and restarting the Codex app fixes it temporarily.
Here is a video showcasing the bug.
codex-effort-bug-redacted.mp4
Neuro-Dynamics commentedon Apr 27, 2026
I am seeing the same in 26.422.30944 windows 11. The model and effort does seem to change but the GUI does not update. Restarting fixes it temporarily.
pauloportella commentedon Apr 28, 2026
I am still seeing this in the latest Codex App build I have installed:
26.422.62136Pro 200Darwin 25.5.0 arm64 armModel selection and reasoning/intelligence selection are still broken in the app on this version. The issue is not just historical to
26.406.31014; it still reproduces after updating to26.422.62136.I searched for newer duplicates before commenting. This issue still appears to be the closest match because it tracks being unable to change both the model and reasoning effort in the Codex App.
marijnbent commentedon Apr 28, 2026
+1
kdawgwilk commentedon Apr 28, 2026
Looks like it was acknowledged by the team now that someone with a large following was able to bring some visibility to the issue 👏
wbdb commentedon Apr 30, 2026
+1 / Codex Windows / WSL2 - v26.422.71525
d1ys3nk0 commentedon Apr 30, 2026
Still being annoyed by this in
Version 26.422.71525 (2210):)harvitronix commentedon May 5, 2026
This bug seems to happen to me all the time now (Version 26.429.30905 (2345)) - I have two solutions:
junhao-ray commentedon May 6, 2026
It's still occurring in the latest Version 26.429.61741 (2429), restarting can solve the problem for a while. But it's annoying when working on parallel projects.
justin-caldicott commentedon May 7, 2026
Seeing the same in Version 26.429.61741 (2429) on Mac. Clicking a different intelligent level is ignored sometimes. Restart the app also seems to help.
Surprising such a simple but annoying issue is lingering around.
octaviotastico commentedon Sep 3, 2026
Something similar is happening to me, in Mac.
This error doesn't happen on my windows PC, but happens on both my Mac laptops.
Grabacion.de.pantalla.2026-08-21.a.la.s.12.19.47.p.m.mov
broken-fire-egg commentedon Oct 15, 2026
26.1013.11914 on Window11
x1.5 speed up toggle works normally.
Back to default button makes another fixed model status.
Restarting the app doesn't help.
I have never seen this bug in any previous versions.
This bug occurs only in the new chat
Once the chat starts, I can change the model normally
Deleting .codex/config.toml makes the bug disappear, but obviously the settings in that file are no longer applied either, so this could be seen as cutting the knot rather than untying it.
2026-10-15.16-49-13.mp4