Mention Feature (@) Not Working**

[naive imp]

Reported by @light veldt

Bug Report: Mention Feature (@) Not Working**

`Steps to Reproduce`

1. Open ChatGPT on Android or Chrome browser.
   2. Attempt to use the "@" feature to tag a role or user.
   3. Observe that the mention does not work as expected.

`Expected Result`

The "@" should allow tagging of custom GPTs seamlessly.

`Actual Result`

The mention feature is non-functional, preventing GPTs from being invoked.

`Environment`

This issue occurs across both the app and web versions of ChatGPT on my Samsung Galaxy S23 Ultra.

Nov 24, 2024, 9:29 PM

Additional Information

Please provide relevant details to help resolve the issue, such as:

• ChatGPT Shared Link (if applicable).
• Screenshots or videos demonstrating the problem.

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[dusty cypress]

Same issue in my enterprise environement. Opened a support ticket and they acknowledged and were able to reproduce the issue. Support response was that they would look into it, but no estimate on a fix:

Hi there,

Thank you for sharing your feedback with us. We really appreciate you taking the time! While we can’t guarantee that your suggestion will be implemented or provide updates on its status, we have shared it with the appropriate team for review. The @ feature has not been deprecated and won't be deprecated our engineering team will work towards re-enabling it for 5.1 models.

If you need help with anything else, feel free to reach out anytime. We’re here to help.

Best,
Tomi
OpenAI Support

[autumn loom]

Hi, I am having the same strange issue with the @mentions feature.

On the web, @mentions only work if I am using a legacy model. For example, if I select any legacy model such as GPT-4o or GPT-4.1, I can type @ in a chat and the menu pops up showing my GPTs and I can pick one as usual. But if I switch that exact same conversation to GPT-5.1 or Auto, typing @ does absolutely nothing. No menu, no list, no connectors, no UI reaction at all. The only variable that changes is the model.

On the Android app (from the Play Store), it is even worse. Typing @ does nothing in any chat, no matter which model I choose. I tried GPT-5.1, Auto, GPT-4o and other legacy models. In all cases, @ behaves like a normal character and never opens the mentions menu.

I also noticed something odd in older conversations where I had used multiple GPTs in the past. Before, there was a small GPT name badge above the assistant messages, showing which GPT was responding in that thread. Those labels are now gone in those old chats. The GPTs themselves still exist in my pinned list and I can start new chats with them, so they were not deleted. It just looks like the link between those conversations and the GPTs is no longer visible and @mentions also do not work there anymore.

Here is what I have already tried:

• Different accounts on the same device, same behaviour.

• Different browsers on the web client.

• Incognito or private mode with no extensions.

• Clearing cache and cookies for ChatGPT.

• No VPN or proxy.

The pattern is always the same: on the web, @mentions only work if I use a legacy model, and stop working as soon as I switch to GPT-5.1 or Auto. On the Android app, @mentions never work in any model.

Is this a known issue with GPT-5.1 and or the mobile app, or is there anything else I should try on my side?