All of the most popular artificial intelligence chatbots have the ability to upload and summarize documents, from legal contracts to an entire book. The tech promises to give you a kind of speed-reading superpower. But do any of the bots really understand what they’re reading?To figure out which AI tools you can trust as a reading assistant, I held a competition. I challenged five bots to read four very different types of writing and then tested their comprehension. The reading spanned the liber...