Microsoft's AI chatbot was initially only available in the company's own search engine, where it was called Bing Chat, but following its rebranding as Copilot in November, it's now available on all major platforms. Days after releasing the Android app in December, Microsoft also published an iOS version the text and image-generating AI chatbot for on iPhones and iPads. The AI assistant is based on GPT-4 for speech and Dall-E 3 for visualizations and is similar to ChatGPT, except that it also add