Spell Check Vietnamese

What version of the Codex App are you using (From “About Codex” dialog)?

Codex for Windows 26.611.8604.0

What subscription do you have?

Chatgpt 5.5 Plus thing king

What platform is your computer?

win 10

What issue are you seeing?

<img width="920" height="774" alt="Image" src="https://github.com/user-attachments/assets/5cc23d7e-98e0-4efb-8f12-ae69a9200c64" />

Codex for Windows 26.611.8604.0 forces the spellchecker to use en-US, so normal Vietnamese text is underlined as misspelled. Disabling “Highlight misspelled words” in Windows has no effect. Please add an in-app option to disable spellcheck or select Vietnamese.

What steps can reproduce the bug?

You just need to type Vietnamese into the chat.

What is the expected behavior?

I’m really bothered by the red underlines in the text, and I hope the developers will fix this issue soon.

Additional information

Once the issue has been fixed, I would appreciate receiving an email notification from the publisher to confirm that it has been resolved.