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Context compaction fails with unknown parameter 'prompt_cache_retention' #17809
Description
What version of the Codex App are you using (From “About Codex” dialog)?
26.409.20454 (1462)
What subscription do you have?
ChatGPT Pro
What platform is your computer?
Darwin 25.2.0 arm64 arm
What issue are you seeing?
While using the Codex Mac app, automatic context compaction fails instead of compacting the thread.
The app shows this error inline in the chat UI:
Error running remote compact task: { "error": { "message": "Unknown parameter: 'prompt_cache_retention'.", "type": "invalid_request_error", "param": "prompt_cache_retention", "code": "unknown_parameter" } }
This appears during the "Automatically compacting context" step. Instead of compacting the conversation, the app surfaces the raw API error.
What steps can reproduce the bug?
- Open the Codex macOS app.
- Work in a thread until the app attempts automatic context compaction.
- Wait for the "Automatically compacting context" message to appear.
- Observe that the compact task fails with:
Error running remote compact task: { "error": { "message": "Unknown parameter: 'prompt_cache_retention'.", "type": "invalid_request_error", "param": "prompt_cache_retention", "code": "unknown_parameter" } }
What is the expected behavior?
Automatic context compaction should complete successfully and continue the conversation normally.
Additional information
Running /compact manually on the same thread from the CLI results in this:
Error running remote compact task: {
"error": {
"message": "Unknown parameter: 'prompt_cache_retention'.",
"type": "invalid_request_error",
"param": "prompt_cache_retention",
"code": "unknown_parameter"
}
}
Activity
monkey-sheng commentedon Apr 14, 2026
Getting this too in VS Code extension, thread id: 019d8b82-66f8-7d22-a34d-40e6f025fe4e
Mygod commentedon Apr 14, 2026
+1 on CLI
JamesticCS commentedon Apr 14, 2026
Getting this too in CLI
atonderski commentedon Apr 14, 2026
getting this codex-cli 0.120.0
popperwin commentedon Apr 14, 2026
Same issue
TigerHix commentedon Apr 14, 2026
oh my god not now codex
dotdioscorea commentedon Apr 14, 2026
+1 on CLI across many accounts and machines
maroshvarchola commentedon Apr 14, 2026
Probably just api is down
[-]Automatic context compaction fails with unknown parameter 'prompt_cache_retention'[/-][+]Context compaction fails with unknown parameter 'prompt_cache_retention'[/+]Gk0Wk commentedon Apr 14, 2026
+1 on cli, win11, 0.119.0
valmedia commentedon Apr 14, 2026
new model incoming
frdmir commentedon Apr 14, 2026
same issue, cannot compact context.
13 remaining items
pinciottima commentedon Apr 14, 2026
+1 macOS Codex Desktop
Jonomir commentedon Apr 14, 2026
Damm, now I have to start another tread and its going to take some time to gather context until its not dumb anymore
MarcusNeufeldt commentedon Apr 14, 2026
Seeing the same issue here on Windows 11 with
codex-cli 0.120.0using ChatGPT sign-in andgpt-5.4.It started suddenly on April 14, 2026 after previously working reliably. Automatic compaction fails with:
/compactfails with the same error, so the affected thread becomes unusable once compaction kicks in.Thread ID from my local logs:
019d8b82-60a7-77d1-b8dc-48030b8c7772.videogorl commentedon Apr 14, 2026
+1 on macOS Codex Desktop
swapnil-sudhir commentedon Apr 14, 2026
+1 on macOS codex desktop -
Error running remote compact task: { "error": { "message": "Unknown parameter: 'prompt_cache_retention'.", "type": "invalid_request_error", "param": "prompt_cache_retention", "code": "unknown_parameter" } }
KFCDeveloper commentedon Apr 14, 2026
+1 Error running remote compact task: { "error": { "message": "Unknown parameter: 'prompt_cache_retention'.", "type": "invalid_request_error", "param": "prompt_cache_retention", "code": "unknown_parameter" } }
kmalyshev commentedon Apr 14, 2026
+1 Error running remote compact task: stream disconnected before completion: error sending request for url (https://chatgpt.com/backend-api/codex/responses/compact)
swapnil-sudhir commentedon Apr 14, 2026
Quit and Reopened the app on MacOS, and its working now, in the same thread.
dotdioscorea commentedon Apr 14, 2026
Panic over, all working again
CarlosFelipeArantes commentedon Apr 14, 2026
Working fine!
Rafael135790 commentedon Apr 14, 2026
WORKING
etraut-openai commentedon Apr 14, 2026
We rolled back the change that caused this regression, so this should be addressed now. Apologies for the inconvenience.
codinghasnat commentedon Apr 14, 2026
Okay they said its fixed, by my tokens for this 5h sprint are all eaten now ahaha
David-D-Com commentedon Apr 15, 2026
I'm curious, what was the change?