Slow connections and 503 errors
Resolved 💬 2 comments Opened Apr 8, 2026 by CodeWithBenjii Closed Apr 8, 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?
codex-cli 0.118.0
What subscription do you have?
pro
Which model were you using?
gpt-5.3-codex-spark xhigh
What platform is your computer?
Darwin 25.3.0 arm64 arm
What terminal emulator and version are you using (if applicable)?
Iterm2
What issue are you seeing?
503 errors and slow interaction with the spark models.
What steps can reproduce the bug?
Uploaded thread: 019d6af9-d7ae-7651-9004-794a6edb704b
What is the expected behavior?
_No response_
Additional information
└ Unexpected status 503 Service Unavailable: upstream connect error or disconnect/reset before headers. reset reason: connection termination, url:
wss://chatgpt.com/backend-api/codex/responses, cf-ray: 9e8e08673db4979c-ADL
2 Comments
Potential duplicates detected. Please review them and close your issue if it is a duplicate.
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The team is investigating. Closing in favor of #17068, which we'll use to track the issue.