Error running remote compact task: unexpected status 404 Not Found

Resolved 💬 8 comments Opened Aug 15, 2026 by noor13a Closed Aug 20, 2026

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

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

26.519.2081.0

What subscription do you have?

pro

What platform is your computer?

windows

What issue are you seeing?

Context automatically compacted
Error running remote compact task: unexpected status 404 Not Found: {"detail":"Not Found"}, url: https://chatgpt.com/backend-api/codex/responses/compact, cf-ray: a2b5b9e16a3aa056-DOH, request id: d627d1c4-fd6a-4a7e-b757-dd856c4c9d03

What steps can reproduce the bug?

640d2bf3-dff5-485c-900a-84319dd7494d
9dcd2e2d-ccc2-4038-a139-94b49ad0260f
84652eae-00d4-4ef4-ca40b0
6adb6cb9-0679-4224-9a78-5796d10b871c
d627d1c4-fd6a-4a7e-b757-dd856c4c9d03
1560b8ef-525d-4fe9-9160-0611d7f88fbb

What is the expected behavior?

we opened new thread then after 4 prompts the same error msg apears

Additional information

_No response_

View original on GitHub ↗

8 Comments

github-actions[bot] contributor · 13 days ago

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

#38525
#38513
#38370
#38323
#38240

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noor13a · 13 days ago

853ba319-b50c-4c74-99d4-7bc206b72758 another issue with codex, this is getting crazy

noor13a · 13 days ago

it just keeps going even when i downgrade to 5.4 still it crashes after 4 prompts

MaryNuella · 12 days ago

I am having same issues and I am a plus subscriber

FilthyMick · 10 days ago

I’m seeing the same issue on Windows with Codex Desktop.

Environment:

Codex Desktop: 0.130.0-alpha.5
Auth mode: ChatGPT
Model: gpt-5.4
Date observed: 2026-08-17

Exact error:
Error running remote compact task: unexpected status 404 Not Found: {"detail":"Not Found"}, url: https://chatgpt.com/backend-api/codex/responses/compact

Local log evidence:

request id: 90b1c7e3-4836-4016-be31-785679dd33a2
cf-ray: a2cb3dd88d7aaab6-YYZ
event timestamp: 2026-08-17T19:56:21.278Z

Additional notes:

The session was not lost locally; the rollout file still existed and was recoverable from disk.
I also saw a separate compatibility/parsing error in the same client build:

failed to decode models response: unknown variant 'max', expected one of 'none', 'minimal', 'low', 'medium', 'high', 'xhigh'

chengjiali · 8 days ago

same problem here

noor13a · 8 days ago

solved it, got to this page https://chatgpt.com/download/ and update the desktop and that should solve the issue, it's called chatgpt for desktop not codex

joonas-fi · 7 days ago

Yup can confirm, I was using Codex CLI (only three months old version) and updating to newer version fixed it.

Guess they changed their remote APIs to just drop compatibility for "old" versions. 🤷