Codex desktop terminal keyboard paste inserts text twice on Windows

[NYuget19]

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

Latest version available as of May 8, 2026

What subscription do you have?

plus

What platform is your computer?

windows

What issue are you seeing?

In the Codex desktop app embedded terminal, keyboard-based paste inserts the clipboard contents twice.

Right-click paste works correctly. The issue only happens in the embedded terminal, not in the Codex chat input and not in external terminals.

Steps to reproduce

1. Open the Codex desktop app on Windows.
2. Focus the embedded terminal.
3. Copy any short text, for example: test
4. Paste it into the embedded terminal using Ctrl+V.
5. The text is inserted twice.
6. Repeat with Ctrl+Shift+V.
7. The text is inserted twice.
8. Repeat with Shift+Insert.
9. The text is inserted twice.
10. Paste using right-click.
11. Right-click paste inserts the text only once.
12. Paste into the Codex chat input.
13. Paste works normally there.
14. Paste into an external terminal.
15. Paste works normally there.

Expected behavior

Keyboard paste should insert the clipboard contents once.

Actual behavior

Keyboard paste inserts the clipboard contents twice.

Additional information

• External terminals work normally.
• Codex chat input works normally.
• Only the Codex embedded terminal has the issue.
• Right-click paste works normally.
• Ctrl+V, Ctrl+Shift+V, and Shift+Insert all paste twice.
• Rebooting and reinstalling Codex did not fix the issue.
• This does not appear to be a PowerShell, PSReadLine, IME, or clipboard content issue.

What steps can reproduce the bug?

1. Open the Codex desktop app on Windows.
2. Focus the embedded terminal.
3. Copy a short text string, for example: test
4. Paste it into the embedded terminal using Ctrl+V.
5. Observe that the text is inserted twice.
6. Repeat the same test using Ctrl+Shift+V.
7. Observe that the text is inserted twice again.
8. Repeat the same test using Shift+Insert.
9. Observe that the text is inserted twice again.
10. Paste the same text using right-click paste.
11. Observe that right-click paste inserts the text only once.
12. Paste the same text into the Codex chat input or an external terminal.
13. Observe that paste works normally outside the Codex embedded terminal.

What is the expected behavior?

No response

Additional information

No response

[NYuget19]

I already tried the following, but the issue still happens:

• Rebooted Windows.
• Reinstalled Codex.
• Tested Codex chat input: paste works normally.
• Tested external terminals: paste works normally.
• Tested right-click paste in Codex terminal: works normally.
• Tested Ctrl+V, Ctrl+Shift+V, and Shift+Insert in Codex terminal: all paste twice.
• Tested PowerShell/PSReadLine-related troubleshooting.
• Disabled Windows clipboard history.
• Ran Codex as administrator.
• Checked for keyboard/clipboard helper apps, but none appear to be installed or running.
• Reset Codex/OpenAI local app data by renaming:
  • C:\Users\8to93\AppData\Local\OpenAI
  • C:\Users\8to93\AppData\Local\Codex, if present
  • C:\Users\8to93\AppData\Roaming\Codex, if present
• After resetting local app data and restarting Codex, the issue still happens.

This appears to be specific to the Codex embedded terminal keyboard paste handler. It does not seem to be caused by clipboard contents, PowerShell, PSReadLine, Windows clipboard history, or Codex user settings.

[VirgilWa]

Adding confirmation from a duplicate report (#21729), now closed in favor of this issue.

Additional repro details from my environment:

• Codex App version: 26.506.21252
• OS: Windows 10 Pro 25H2, build 26200.8328
• Keyboard paste duplicates the text in the embedded terminal.
• Right-click paste works normally.
• The duplication reproduces across PowerShell, PowerShell 7.6.1 (pwsh), and Command Prompt.
• Removing PSReadLine does not change the behavior.
• The duplicated text is written into the real input buffer, not just rendered twice visually.

This supports the current hypothesis that the issue is in the Codex App embedded terminal keyboard-paste/input handling path rather than in a specific shell.

[lhdx512]

Adding another Windows confirmation with a slightly different repro detail and a code-level lead.

Environment:

• Codex Windows Store package path/version: OpenAI.Codex_26.506.3484.0_x64__2p2nqsd0c76g0
• Shell: Windows PowerShell 5.1 in the Codex embedded terminal
• Repro: both keyboard paste and right-click paste insert the clipboard contents twice in the embedded terminal

Local checks that did not fix it:

• Removed the PowerShell profile used during testing
• Disabled Windows Console QuickEdit under HKCU:\Console and the PowerShell console subkeys
• Verified/restarted Codex after those changes
• Tested as administrator; the paste duplication still reproduces

Code-level observation from the bundled app renderer:

The embedded terminal bundle contains an xterm paste handler shaped like:

handlePasteEvent = function (e, textarea, coreService, optionsService) {
  e.stopPropagation();
  if (e.clipboardData) paste(e.clipboardData.getData("text/plain"), textarea, coreService, optionsService);
}

That handler manually sends the clipboard text to the terminal but does not call e.preventDefault(). In Electron/Chromium, the default paste action can still insert the same clipboard text into the hidden textarea, which then flows through the normal input path. That would explain a double insert, and it also matches the right-click paste duplication seen here.

I prepared a local test patch that changes the handler to call preventDefault() before stopPropagation():

e.preventDefault();
e.stopPropagation();

I could not safely apply it to the installed Store package on the affected machine because WindowsApps/TrustedInstaller blocks writes to app.asar, but this looks like a likely minimal fix in the terminal paste event path.

[JasonxzWen]

Adding another Windows confirmation where all keyboard paste paths duplicate text in the Codex embedded terminal.

Environment:

• Codex Windows Store package: OpenAI.Codex 26.506.3741.0 (OpenAI.Codex_26.506.3741.0_x64__2p2nqsd0c76g0)
• OS: Windows 11 Pro, version 10.0.26100, build 26100, x64
• Shell in embedded terminal: Windows PowerShell 5.1.26100.7920

Repro:

1. Open the Codex desktop app embedded terminal with PowerShell.
2. Copy plain text into the clipboard.
3. Paste once using Ctrl+V, Ctrl+Shift+V, or Shift+Insert.

Expected: clipboard text is inserted once.

Actual: clipboard text is inserted twice.

Scope / negative checks:

• External PowerShell does not reproduce the issue, regardless of paste method.
• No third-party keyboard macro or clipboard helper tools are involved.
• Restarting Codex and updating to the latest available version did not fix it.
• The behavior is specific to the Codex embedded terminal, not PowerShell itself.

This looks consistent with duplicate paste handling in the Codex app terminal frontend.

[bcherup]

It's doing this on Cloud / web-based version as well