Clicking GPT-5.5 in non-project Codex Desktop chats has no effect

What issue are you seeing?

In the Codex Desktop app, a chat that is not attached to any project cannot be switched from GPT-5.4 to GPT-5.5.

When I open the model selector and click GPT-5.5, nothing changes: the selection/checkmark remains on GPT-5.4. GPT-5.5 is visible in the menu, but clicking it has no effect in a non-project chat.

However, when I start or open a chat inside a project, GPT-5.5 can be selected normally.

Steps to reproduce

1. Open the Codex Desktop app.
2. Start a new chat without selecting Work in a project / without attaching a project.
3. Open the model selector.
4. Click GPT-5.5.
5. Observe that nothing changes and the selected model remains GPT-5.4.
6. Start or open a chat inside a project.
7. Open the model selector and click GPT-5.5.
8. Observe that GPT-5.5 can be selected normally in the project-based chat.

Expected behavior

GPT-5.5 should be selectable in both:

• chats with a selected project
• chats without a selected project

Actual behavior

In non-project chats, clicking GPT-5.5 has no effect and the chat remains selected on GPT-5.4. In project-based chats, GPT-5.5 can be selected normally.

Environment / account

• App: Codex Desktop app
• Codex version: 26.422.20832 (2025)
• Subscription: Pro
• Platform: macOS

Additional information

The attached screenshot shows the model selector where GPT-5.4 remains checked while GPT-5.5 is visible as an option in a chat where no project is selected.

<img width="2140" height="982" alt="Image" src="https://github.com/user-attachments/assets/69736f98-2fbb-4254-bfa6-9b0a256e2d29" />