Unknown parameter: 'prompt_cache_retention'.

What version of Codex CLI is running?

codex-cli 0.120.0

What subscription do you have?

Pro 200$

Which model were you using?

gpt-5.4 high

What platform is your computer?

Linux 5.15.0-139-generic x86_64 x86_64

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

Gnome terminal + Tmux

What issue are you seeing?

After a long continuous session I started getting this error as a response to every prompt:

■ Error running remote compact task: {
  "error": {
    "message": "Unknown parameter: 'prompt_cache_retention'.",
    "type": "invalid_request_error",
    "param": "prompt_cache_retention",
    "code": "unknown_parameter"
  }
}

Restarting codex does not help.

What steps can reproduce the bug?

Uploaded thread: 019d77ac-c213-7df3-899b-46d23518fc1d

What is the expected behavior?

_No response_

Additional information

_No response_