Back then–only months ago—Marcus’ quibbling was technical. But now that large language models have become a global phenomenon, his focus has shifted. The crux of Marcus’ new message is that the chatbots from OpenAI, Google, and others are dangerous entities whose powers will lead to a tsunami of misinformation, security bugs, and defamatory “hallucinations” that will automate slander. This seems to court a contradiction. For years Marcus had charged that the claims of AI’s builders are overhyped. Why is AI now so formidable that…