codex - 💡(How to fix) Fix Codex app terminal renders with extreme letter spacing after update on macOS [2 comments, 2 participants]

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openai/codex#18869Fetched 2026-04-22 07:51:13
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After updating the Codex app, the embedded terminal in the desktop app renders text with extreme letter spacing, making commands and output look broken and hard to read.

Root Cause

After updating the Codex app, the embedded terminal in the desktop app renders text with extreme letter spacing, making commands and output look broken and hard to read.

Code Example

c d  "/ U s e r s / m a c / C o d i n g / H e r m e s / h e r m e s - a g e n t"
RAW_BUFFERClick to expand / collapse

Summary

After updating the Codex app, the embedded terminal in the desktop app renders text with extreme letter spacing, making commands and output look broken and hard to read.

Environment

  • Product: Codex desktop app
  • Platform: macOS
  • Date observed: April 21, 2026
  • Version: latest available update at the time of filing

Actual behavior

Terminal text in the app is spaced out character-by-character. In the affected session, commands and output looked roughly like this:

c d  "/ U s e r s / m a c / C o d i n g / H e r m e s / h e r m e s - a g e n t"

The rest of the prompt and shell output show the same exaggerated spacing, so the terminal becomes difficult to use.

Expected behavior

The terminal should render using normal monospace spacing, with commands and output displayed exactly as typed.

Reproduction

  1. Open the Codex desktop app on macOS.
  2. Open a project/thread with the embedded terminal visible.
  3. After the recent update, observe terminal input/output rendering.

Notes

  • This looks like a rendering/font regression in the app rather than a shell issue.
  • The Codex app settings expose theme and UI/code font controls, but there does not appear to be a terminal-specific spacing setting.
  • Restarting the app did not appear to be the intended fix from the user perspective.

If useful, I can add a screenshot of the broken rendering in a follow-up comment.

extent analysis

TL;DR

Adjusting the font settings in the Codex app, particularly focusing on the UI/code font controls, might mitigate the extreme letter spacing issue in the embedded terminal.

Guidance

  • Verify that the issue persists across different themes and font settings to isolate if the problem is theme-specific or related to a particular font.
  • Check if there are any hidden or advanced settings within the Codex app that could influence terminal rendering, such as character spacing or font ligature settings.
  • Consider testing the terminal in a different project or thread to see if the issue is project-specific or a global app problem.
  • If possible, compare the rendering of the terminal in the Codex app with a native terminal app on macOS to confirm if the issue is indeed specific to the Codex app's rendering.

Example

No specific code snippet can be provided without more details on the app's internal workings or access to its source code. However, if the issue is related to font rendering, adjusting font family, size, or style might help.

Notes

The solution might depend on the specifics of the Codex app's implementation and how it handles font rendering in its embedded terminal. Without direct access to the app's codebase or more detailed documentation on its settings, the suggestions are based on general principles of troubleshooting font rendering issues.

Recommendation

Apply workaround: Adjusting font settings or exploring hidden settings within the app seems to be the most viable immediate solution, given the information provided. This approach allows users to potentially mitigate the issue without waiting for a patch or update from the developers.

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FAQ

Expected behavior

The terminal should render using normal monospace spacing, with commands and output displayed exactly as typed.

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