Illustration: Allie Carl/AxiosThe new voice assistant version of ChatGPT that OpenAI demonstrated Monday jokes, chides, apologizes, pretends to blush — and knows how to deal with interruptions.Why it matters: ChatGPT-4o shows off a new level of real-time conversational fluency — including the ability to understand context and shift gears when people talk over it — that AI assistants will need to win over the world's users. Driving the news: The new ChatGPT-4o (that's a lower case "o," for "omni...