Microsoft has introduced the latest model of ChatGPT, GPT-4Turbo, to Bing Chat. GPT-4Turbo is an upgraded version of the existing GPT-4 model, containing information up to April 2023. Currently, GPT-4Turbo is only available to a selected group of random testers. You can check your eligibility by opening the webpage source code in the desktop version of Bing Chat and searching for 'dlgpt4t'. Microsoft also plans to upgrade the code interpreter functionality.