Allow gpt-5 and gpt-5-codex
Resolved 💬 6 comments Opened Nov 15, 2025 by teeay-dev Closed Nov 15, 2025
💡 Likely answer: A maintainer (github-actions[bot], contributor)
responded on this thread — see the highlighted reply below.
What version of Codex is running?
codex-cli 0.58.0
What subscription do you have?
Pro
Which model were you using?
gpt-5.1-codex high
What platform is your computer?
Darwin 25.1.0 arm64 arm
What issue are you seeing?
5.1 is forgetful, unstructured and not following instructions very well. It gets lost in anything but the simplest actions.
There is no option to use gpt-5 or gpt-5-codex in the CLI.
What steps can reproduce the bug?
"Bug"? I think this was meant to be a feature, to be more personable, but for coding, I don't want a personable, but silly assistant.
What is the expected behavior?
- Ability to reset to gpt-5-codex high
- Eventually restoring the focused, determined behaviour that was observed with gpt-5-codex to a new version (or perhaps system prompt adjustments)
Additional information
_No response_
6 Comments
Potential duplicates detected. Please review them and close your issue if it is a duplicate.
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codex -m gpt-5-codexdo not work? second: look at config file. Codex changed my profile from 5 to 5.1 :/Good point, that works, so the bug part is that
/modeldoesn't list it and the sad part is that 5.1 is personably silly.@voytas75 - thanks, life saver, 5 just fixed a pile of rubbish that 5.1 generated.
5.1 seems to veer towards the boisterous and uncontrolled Sonnet, instead of the reliability I got used to with gpt-5.
I know nobody really cares about these things and nobody reads these issues,
anyhow!("Make it reliable, not personable.")@teeay-dev I 100% agree with you, I also find the model terrible with the same experience
Thanks for the feedback. If you prefer
gpt-5orgpt-5-codexover their5.1counterparts, you can specify that in your config file or on the command line (using the-mcommand-line option).