The world’s most famous chatbot now has a voice and can use it to have real-time conversations with humans, developer OpenAI demonstrated on Monday, unveiling new features of ChatGPT’s AI model GPT-4. In an update that makes ChatGPT a serious competitor to the voice assistants of tech heavyweights like Google, Amazon and Apple, the AI chatbot can now interact with users in a lifelike human voice. Whereas ChatGPT was previously largely used in a text chat, the app can now also respond verbally to what it hears, as well as what it sees through a smartphone camera. In a live demonstration, OpenAI…