ChatGPT Plus: Codex always attempts gpt-5.6-sol and fails #32036

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

26.707.31428 on macOS

What subscription do you have?

Plus

What platform is your computer?

Darwin 25.5.0 arm64 arm

What issue are you seeing?

Platform:

• macOS
• ChatGPT Desktop 26.707.31428
• ChatGPT Plus

Problem:

Every Codex task fails with:

"The 'gpt-5.6-sol' model is not supported when using Codex with a ChatGPT account."

Regular ChatGPT works normally using GPT-5.5.

There is no model selector in the current ChatGPT Codex UI.

Steps attempted:

• Logged out/in
• Reinstalled authentication
• Verified latest desktop version
• Verified ChatGPT works normally
• Submitted desktop feedback

Feedback ID:
019f4a51-94f2-7de2-859f-3b7417cbb767

What steps can reproduce the bug?

Every Codex task fails with:

"The 'gpt-5.6-sol' model is not supported when using Codex with a ChatGPT account.

What is the expected behavior?

I expect that I should be able to select a model other than gpt-5.6-sol that would be compatible with my account and CODEX desktop app

Additional information

No response