Earlier today, OpenAI announced its newest product: GPT-4o, a faster, cheaper, more powerful version of its most advanced large language model, and one that the company has deliberately positioned as the next step in "natural human-computer interaction." Running on an iPhone in what was purportedly a live demo, the program appeared able to tell a bedtime story with dramatic intonation, understand what it was "seeing" through the device's camera, and interpret a conversation between Italian and English speakers. The model--which was powering an updated version of the ChatGPT app--even exhibited something like emotion: Shown the sentence I ChatGPT handwritten on a page, it responded, "That's so sweet of you!" Although such features are not exactly new to generative AI, seeing them bundled into a single app on an iPhone was striking. Watching the presentation, I felt that I was witnessing the murder of Siri, along with that entire generation of smartphone voice assistants, at the hands of a company most people had not heard of just two years ago.