During or after task execution, Codex sometimes displays long nonsensical mixed-language/token strings.

Resolved 💬 3 comments Opened Apr 11, 2026 by kalamall Closed Apr 11, 2026

💡 Likely answer: A maintainer (github-actions[bot], contributor) responded on this thread — see the highlighted reply below.

What version of Codex CLI is running?

5.4

What subscription do you have?

pro

Which model were you using?

gpt-5.4

What platform is your computer?

windows

What terminal emulator and version are you using (if applicable)?

githab

What issue are you seeing?

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What steps can reproduce the bug?

I’m seeing repeated garbled terminal/UI output in Codex that looks like corrupted streamed text rather than a valid model response.

Observed behavior:

During or after task execution, Codex sometimes displays long nonsensical mixed-language/token strings.
The text does not correspond to repo files, test output, or a meaningful assistant response.
It appears as UI/stream corruption rather than task content.
This makes it hard to trust intermediate visible output.

Impact:

I cannot reliably distinguish valid in-progress output from corrupted stream text.
It creates confusion during coding tasks and review.

What would help:

Confirm whether this is a known Codex UI/streaming issue.
Share any mitigation steps.
Clarify whether only completed/final output should be trusted when this happens.

Repro context:

Happened during multi-step coding work with terminal/test output in Codex.
Normal git/test commands were being run when the garbled text appeared.

Please investigate as a possible streaming/rendering bug.

What is the expected behavior?

Additional information

_No response_

View original on GitHub ↗

3 Comments

github-actions[bot] contributor · 4 months ago

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

#17219
#16789
#16526
#16836

Powered by Codex Action

etraut-openai contributor · 4 months ago

Thanks for reporting. I don't think this is a stream rendering bug. This is a known model behavior for some models. We'll share the feedback with the team responsible for training our codex models. If you see other model behavior that you'd like to report, please use the /feedback command. That will provide us with additional details including logs and conversation text.

Arturr-H · 4 months ago

I got the exact same problem. Heres some info about the conversation:

The conversation prior to Codex outputting this was held in Swedish.
~5 third party MCP tools installed.
No custom AGENTS.md file
Working inside a Nextjs project
Happened right after Codex finished a code change.

It's strange, because this output matches the one of @kalamall, and even other opened issues like https://github.com/openai/codex/issues/17219. It doesn't seem random at all.

CodexOutput.txt

Preview of the file

• _toggle_ATTACHMENT_attach hookupளம்_attach Fletcher amplificationേഴ്Toggle_hook/fw/compiler hookup hookup_toggle slicing խորհ hookup mea
  suring/compiler_attach counting hookupനം hooking Fairfieldნი hookupո՞്ഞ_toggle reopening triggering_toggle_attach_ATTACH/compiler hooku
  p_toggle/compiler/compiler topics hookup_toggle hookup        tf ունենալ_topics hookupिशतոկერ hookup attaching rollout_toggleേഴ_attachিৱ/compi
  ler_attach hookupոկোগ_toggle_jobs perceived   pcளம்_toggleaneti_toggle triggeringasl_toggle սկ hooking_topics/npm/compiler hookupিৱಮವಾರ tr
  iggeringTopics նոյ\db_attach hookup_toggle_ATTACH संश_attach/sdk/compiler_toggle/fw_attach hookup_toggle_topics_toggle_attach հասց섭_to
  ggle attaching_toggle_attachment(toggle Referential toggleளம்_toggle graphical hookup_ATTACH hookupात्कार_attach AIMոկোগոէვڍ hookup_togg

_.... And many many more lines_