Codex app auto-generated malformed thread titles on new threads

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

26.409.20454

What subscription do you have?

chatgpt plus

What platform is your computer?

Microsoft Windows NT 10.0.26200.0 x64

What issue are you seeing?

Hi,

I found a repeatable issue in the Codex app thread title generation flow.

Observed behavior:

• The issue happens right after creating a new thread.
• The automatically generated thread title is sometimes malformed.
• I have seen at least two variants:

1. unexpected Arabic text appended to a Chinese title
2. unexpected symbol suffixes such as })]}'}}}

• The malformed title appears both in the left sidebar and at the top of the thread, so the saved title itself is affected.

Additional evidence:

• If I manually rename the thread, the corrected title remains stable.
• After restarting the Codex app, the manually corrected title stays normal.
• This strongly suggests the bug occurs during the initial auto-title generation / post-processing / save step, rather than in ongoing UI rendering or repeated background regeneration.

What steps can reproduce the bug?

The issue happens right after creating a new thread

What is the expected behavior?

• New thread titles should be generated as clean natural-language titles based on the thread content.
• Titles should not include unrelated language fragments or structured/template-like symbol artifacts.

Additional information

Environment:

• Product: Codex app
• OS: Windows
• Dates observed: 2026-04-11 and 2026-04-13
• Thread content language: Chinese and English