Updating an active chat from the iPhone app destabilizes the same chat in the Windows desktop app

What issue are you seeing?

The same ChatGPT conversation was open in the Windows desktop app and on my iPhone.

While the conversation remained active on the desktop, I submitted a new message from the iPhone app.

After the mobile update arrived, the desktop version of the conversation became glitchy instead of cleanly synchronizing the new message and conversation state.

The desktop app did not provide a synchronization notice, conflict warning, reload prompt, or explanation.

This occurred in the new unified ChatGPT Windows desktop app.

What steps can reproduce the bug?

1. Sign into the same ChatGPT account in the Windows desktop app and the ChatGPT iPhone app.

1. Open the same existing conversation on both devices.

1. Keep the conversation open and active in the Windows desktop app.

1. Submit a new message to that conversation from the iPhone.

1. Observe the same conversation in the Windows desktop app.

1. The desktop conversation becomes visually or behaviorally unstable instead of cleanly reconciling the mobile update.The desktop app should receive the remotely submitted message and update the conversation atomically.

It should preserve:

• correct message order
• the active conversation position
• the current response state
• a stable rendered view
• the authoritative conversation history

If simultaneous activity creates a conflict, the app should display a clear synchronization notice and safely reload or reconcile the conversation.

A message submitted from another signed-in device should not destabilize the active desktop chat.

What is the expected behavior?

The desktop app should receive the remotely submitted message and update the conversation atomically.

It should preserve:

• correct message order
• the active conversation position
• the current response state
• a stable rendered view
• the authoritative conversation history

If simultaneous activity creates a conflict, the app should display a clear synchronization notice and safely reload or reconcile the conversation.

A message submitted from another signed-in device should not destabilize the active desktop chat.

Additional information

Desktop platform:
Windows 11 Pro, x64
Windows build 26200

Desktop app:
New unified ChatGPT Windows desktop app

Subscription:
ChatGPT Plus

Secondary device:
ChatGPT iPhone app

The issue occurred while the desktop conversation was already open and active.

The application provided no synchronization warning, conflict message, recovery action, or diagnostic information.

Cross-device diagnostics should record, without exposing conversation content:

• conversation ID
• desktop revision
• mobile revision
• active response state
• reconciliation result
• any failed or duplicated update events