"The model `gpt-5.3-codex` does not exist or you do not have access to it."

What version of Codex CLI is running?

codex-cli 0.103.0

What subscription do you have?

Pay-As-You-Go Company Plan

Which model were you using?

gpt-5.3-codex

What platform is your computer?

Mac

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

Darwin 24.5.0 arm64 arm

What issue are you seeing?

I try starting codex with codex --model gpt-5.3-codex. At first glance, seems like it works:

╭──────────────────────────────────────────────────╮
│ >_ OpenAI Codex (v0.103.0)                       │
│                                                  │
│ model:     gpt-5.3-codex high   /model to change │
│ directory: ~/Documents/redacted           │
╰──────────────────────────────────────────────────╯

then, on my first command (i.e. 'say hi') I get this error message:
Reconnecting... 4/5 (5s • esc to interrupt)
└ Stream disconnected before completion: The model gpt-5.3-codex does not exist or you do not have access to it.

stream disconnected before completion: The model gpt-5.3-codex does not exist or you do not have access to it.

What steps can reproduce the bug?

See above

What is the expected behavior?

Being able to use gpt-5.3-codex high.

Additional information

Is this a subscription issue? An API issue?