“We need to talk,” Brett Vogelsinger said. A student had just asked for feedback on an essay. One paragraph stood out. Vogelsinger, a ninth grade English teacher in Doylestown, Pa., realized that the student hadn’t written the piece himself. He had used ChatGPT. The artificial intelligence tool, made available for free late last year by the company OpenAI, can reply to simple prompts and generate essays and stories. It can also write code. Within a week, it had more than a million users. As of early 2023, Microsoft planned to invest $10 billion into OpenAI, and OpenAI’s value had been put at $29 billion, more than double what it was in…