According to PANews, the 'mention' feature of ChatGPT has been launched on Android and MacOS platforms, though it is not yet available for iOS users. On Android devices, users can now bring up a window to select different GPT models by typing the '@' character, allowing for seamless switching while maintaining chat context. This feature was previously available on the web version but has been introduced later on mobile platforms. Additionally, the latest MacOS ChatGPT update has also enabled this feature on the desktop client.