Codex for Windows: Luna cannot be used as a sub-agent when Sol is selected as the main model

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

26.715.72028

What subscription do you have?

On the Windows version of Codex, when Sol is selected as the main model, Luna cannot be used as a sub-agent. I would expect Sol to be able to delegate tasks to Luna as a sub-agent, but Luna either does not appear as an available sub-agent or cannot be invoked successfully.

What platform is your computer?

• OS: Windows Codex version: [please fill in] Main model: Sol * Intended sub-agent model: Luna

What issue are you seeing?

Luna cannot be used as a sub-agent when Sol is selected as the main model.

What steps can reproduce the bug?

1. Open Codex on Windows.
2. Select Sol as the main model.
3. Start a task that requires or explicitly requests the use of a sub-agent.
4. Attempt to use Luna as the sub-agent.
5. Observe that Luna cannot be selected or invoked.

What is the expected behavior?

When Sol is the main model, Luna should be available and usable as a sub-agent, assuming the account/workspace has access to both models.

Additional information

This appears to be specific to the Windows version of Codex.

It would also be helpful to clarify whether using Luna as a sub-agent under Sol is currently supported by design. If it is supported, this may be a Windows-specific model routing or sub-agent availability issue.