OpenAI Codex (v0.55.0) hangs with no response!

Resolved 💬 5 comments Opened Nov 5, 2025 by pm0code Closed Nov 5, 2025

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

What version of Codex is running?

OpenAI Codex (v0.55.0)

What subscription do you have?

pro

Which model were you using?

gpt-5-medium

What platform is your computer?

windows 11

What issue are you seeing?

I was previously using OpenAI Codex v0.54.0 without issues. After receiving an upgrade notice, I installed v0.55.0 and immediately encountered a critical regression.
When I enter a prompt, Codex begins processing but then abruptly returns nothing—no output, no error—just a silent failure after a few seconds. It behaves like a deer in headlights. I attempted switching models and adjusting parameters, but the issue persists.
To confirm the regression, I uninstalled v0.55.0 and force-installed v0.54.0. The problem disappeared, and Codex resumed normal behavior.
Please investigate this issue. It appears v0.55.0 introduces a breaking change that affects prompt execution and output handling

What steps can reproduce the bug?

see above ^

What is the expected behavior?

working properly :)

Additional information

_No response_

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5 Comments

github-actions[bot] contributor · 9 months ago

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

#6274
#6273
#6272
#6268
#6270

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timyal · 9 months ago

Same here

Chris-Graffagnino · 9 months ago

I also experienced this behavior: https://github.com/openai/codex/issues/6280

etraut-openai contributor · 9 months ago

We had a temporary service outage that affected codex. Should be working again now. Let us know if you're still seeing a problem.

lihaoml · 9 months ago

same here, codex hangs after upgrading to 0.55