Japanese text output is garbled due to encoding issues

[naclqn]

What version of Codex is running?

0.42.0

Which model were you using?

gpt-5-codex

What platform is your computer?

Microsoft Windows NT 10.0.26100.0 x64

What steps can reproduce the bug?

Description

When generating code or text containing Japanese characters, the output is garbled (mojibake).
It looks like an encoding issue (possibly UTF-8 vs Shift-JIS or similar).

Steps to Reproduce

1. Generate text/code that includes Japanese characters using Codex.
2. Observe that the output contains broken characters like �ん���.

Expected Behavior

Japanese characters should be displayed correctly (e.g., こんにちは).

Actual Behavior

Japanese characters are displayed as mojibake (garbled text).

Additional Context

It seems to be an encoding mismatch in the text stream. UTF-8 should be enforced for Japanese output.

What is the expected behavior?

No response

What do you see instead?

No response

Additional information

No response

[naclqn]

[joshka-oai]

I think this will probably be fixed by #4921, but I'm not sure if this issue applies to the cli or vscode (or web perhaps). Can you please clarify?

[github-actions]

Potential duplicates detected. Please review them and close your issue if it is a duplicate.

• Chinese characters in code are garbled in recent Codex versions #4574
• PowerShell encoding issue on Windows: Chinese characters display as garbled text when using stdio with codex-app-server #4498
• [bug] "-" replaced by "‑" #4768

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[joshka-oai]

Closing out as fixed by #4921 If this is in error, please re-open and we'll take another look. Thanks for raising this issue.