Homework Looks Better. Exams Get Worse.
Panoramic Parents
Your kid finishes homework in half the time it used to take. The grades on that homework look great. So why would anyone worry?
Because in one of the longest studies of AI and schoolwork ever run, that exact pattern was the warning sign, not the
win.
The study in one minute
Researchers tracked 26,811 students in grades 7 through 12 in one county in China for 30 months, as generative AI tools spread through their schools. The study is a CEPR Discussion Paper published in June 2026.
Within six months of students starting to use AI, average homework time fell from about 64 minutes to about 45 minutes, a drop of 30 percent. Homework scores rose 18 percent.
But monthly closed-book exam scores fell 20 percent. Over the longer run, high-school entrance exam scores fell 24 percent and college entrance exam scores fell 18 percent.
Better homework. Worse learning. The two moved in opposite directions.
The tell is the clock
Here is the part that matters for your house. About 4 in 5 AI-using students finished in under 50 minutes with exceptionally high homework scores, and their exam scores were markedly worse. That pattern looks like outsourcing: the AI did the work, so the student never wrestled with it.
But the remaining 1 in 5 spent roughly as much time on homework as students who did not use AI. Their homework scores were higher, and their exam scores were about the same. When students spent the same amount of time, they learned as much.
The authors are careful: this was one county in China, not American kids, and the tools were general-purpose chatbots, not tutors designed for learning. They say their results cannot be directly applied to other settings, but should serve as a warning.
Still, the lesson travels well. Learning lives in the struggle, not the finished page.
Tonight, try this
If homework suddenly takes half the time it used to, do not celebrate yet. Ask your kid one question: "What did the AI do, and what did you do?"
Then agree on one house rule together: AI explains, it does not finish. Your kid can ask it to explain a concept, walk through an example, or check their own answer. But the first attempt, and the time spent wrestling with it, stays theirs.
You are not banning a useful tool. You are protecting the part of homework that actually teaches: the minutes your kid spends thinking.
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