OpenAI has developed a tool that can reliably tell when ChatGPT has been used to write an essay or research paper. The company hasn’t released it despite widespread concerns about students using artificial intelligence to cheat. WSJ reporter Deepa Seetharaman joins host Zoe Thomas to explain how the tool works and why OpenAI hasn’t released it. Plus, big tech companies have found a way to get talent and technology from AI startups without acquiring them.

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