Can't set reasoning effort minimal for gpt-5
Resolved 💬 3 comments Opened Aug 12, 2025 by pedrosarkis Closed Aug 14, 2025
💡 Likely answer: A maintainer (seratch, member)
responded on this thread — see the highlighted reply below.
What version of Codex is running?
0.21.0
Which model were you using?
gpt-5
What platform is your computer?
ubuntu 23
What steps can reproduce the bug?
edit gedit \~/.codex/config.toml, set the model to gpt-5 and reasoning effort to minimal. restart the terminal, open codex and send a message
What is the expected behavior?
the expected behavior was for it to work normally, but it throws an error when opening, saying that minimal is not a valid configuration
What do you see instead?
i see an error saying that minimal is not a valid configuration for reasoning effort
Additional information
_No response_
3 Comments
Use "low"
hahahah i appreciate the tip, but the bug would still exist even if i use low, it doesn’t change the fact that minimal is a valid parameter and it’s broken
Thanks for sharing this, and this still exists. Let me merge this issue into https://github.com/openai/codex/issues/2296, which has more details in its description.