/realtime does not work

What version of Codex CLI is running?

codex-cli 0.120.0

What subscription do you have?

Pro

Which model were you using?

gpt-5.4

What platform is your computer?

Darwin 24.3.0 arm64 arm

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

MacOS standard terminal

What issue are you seeing?

I enabled realtime_conversation using the command "codex features enable realtime_conversation" and checked my config.toml to confirm that it set realtime_conversation = True. However, when I try to use /realtime in the codex cli I get the following error:

■ Realtime voice error: unexpected status 404 Not Found: {"detail":"Not Found"},
url: https://chatgpt.com/backend-api/codex/realtime/calls, cf-ray: 9ead10a06b91
44d9-ATL, request id: e7f48797-74c9-4033-aad9-9850b03e3fff

I've tried restarting codex as well as logging out and logging in again and nothing is helping. Any other things I should try or is it currently broken?

What steps can reproduce the bug?

1. Run "codex features enable realtime_conversation"
2. Open codex cli using "codex"
3. Inside the codex cli, use /realtime
4. Note 404 realtime voice error

What is the expected behavior?

Codex initiates realtime voice mode

Additional information

_No response_