Codex-5.1-mini hallucinates heavily
Resolved 💬 2 comments Opened Dec 1, 2025 by RaoG812 Closed Dec 1, 2025
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_
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