Codex-5.1-mini hallucinates heavily
Resolved 💬 2 comments Opened Dec 1, 2025 by RaoG812 Closed Dec 1, 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-5.1-mini
What subscription do you have?
Plus
Which model were you using?
codex-5.1-mini
What platform is your computer?
Window x86
What issue are you seeing?
Codex produces foreign language or non ASCII characters
<img width="1883" height="717" alt="Image" src="https://github.com/user-attachments/assets/3c1b8050-a734-4ea1-b1d6-e699cb94d134" />
What steps can reproduce the bug?
Builds (local IDE with cloud deployment on vercel)
What is the expected behavior?
Expected to stay within defined encoding.
Additional information
_No response_
2 Comments
Potential duplicates detected. Please review them and close your issue if it is a duplicate.
Powered by Codex Action
Thanks for the bug report. We'll share the feedback with the team responsible for training our models. If you see other model behavior that you'd like to report, please use the
/feedbackcommand. That will provide us with additional details including logs and conversation text.