exec is not allowed to use "GPT-5.3-Codex-Spark" model returns an error

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

v0.104.0

What subscription do you have?

Pro

What platform is your computer?

Linux 6.8.0-90-generic x86_64 x86_64

What issue are you seeing?

There is a bug in the exec using the "GPT-5.3-Codex-Spark" model, I am trying to see how efficient the model is by running different tests. I like the fact it's faster and cheaper model - but without being able to automate tests I'm not going to have the confidence to switch.

This is the error returned.

ERROR: {"detail":"The 'GPT-5.3-Codex-Spark' model is not supported when using Codex with a ChatGPT account."}

You can use the model in interactive mode but not exec.

What steps can reproduce the bug?

This fails:
codex exec --model "GPT-5.3-Codex-Spark" "what is model name"

This does not fail:
codex --model "GPT-5.3-Codex-Spark" (then using the model in interactive manner in codex cli)

The issue only appears when using exec command is used

What is the expected behavior?

codex exec --model "GPT-5.3-Codex-Spark" "what is model name" should return a valid response, it should not return an error.

Additional information

_No response_