Codex iOS remote task on Windows 26.527 ignores xhigh and starts gpt-5.5 medium

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

Codex 26.527.31326

What subscription do you have?

PRO

What platform is your computer?

Microsoft Windows NT 10.0.26200.0 x64

What issue are you seeing?

Summary

When I start a Codex task from the ChatGPT iOS app on my iPhone and explicitly select gpt-5.5 with xhigh reasoning, the corresponding session on my Windows Codex app consistently starts/runs as gpt-5.5 medium.

This appears to happen specifically through the mobile remote-task / remote-control path. My expectation is that the model and reasoning effort selected on iOS should be propagated to the Windows Codex app-server/session for the initial turn.

What I am seeing

1. I open ChatGPT on iOS.
2. I use the Codex integration to send/start a task for an existing project on my Windows machine.
3. Before sending the task, I manually select:

• model: gpt-5.5
• reasoning effort: xhigh

1. The task is successfully delivered to the Windows Codex app.
2. When I inspect the corresponding session on the Windows machine, the session shows/runs as:

• gpt-5.5 medium

This happens repeatedly. I have not seen the mobile-started task preserve xhigh on the Windows side.

Actual behavior

The Windows Codex session is created as:

gpt-5.5 medium

This suggests that the mobile-selected xhigh reasoning effort may not be passed to the Windows app-server/session creation path, or it is being overwritten by a default / persisted / collaboration-mode setting.

What steps can reproduce the bug?

Steps to reproduce

1. Install and sign in to Codex for Windows.
2. Use a Windows Codex app version with Windows remote-control support, for example 26.527.31326.
3. Connect the Windows Codex host to ChatGPT mobile.
4. On iPhone, open ChatGPT iOS 1.2026.139.
5. Open Codex from ChatGPT iOS.
6. Select a project hosted on the Windows machine.
7. Start a new Codex task from the iOS app.
8. Before submitting the task, select:

• gpt-5.5
• xhigh

1. Submit the task.
2. On the Windows machine, open the corresponding Codex session.
3. Check the model/reasoning shown in the session, /status, or the local session JSONL.

What is the expected behavior?

Expected behavior

The Windows Codex session created from ChatGPT iOS should use the selected model and reasoning effort:

gpt-5.5 xhigh

The initial turn should receive the explicit xhigh reasoning setting selected on iOS.

Additional information

_No response_