UC Berkeley professor Richard Borcherds no longer grades homework for correctness.
AI tools now produce top-scoring answers, so grades no longer show what students learned.
Borcherds won the Fields Medal in 1998, the top honor in mathematics.
Students now get credit for handing homework in on time.
Borcherds calls the new system not a very good one, but says he has no alternative.
Grading for correctness now rewards AI use and punishes honest students, he says.
His main grades now come from in-person exams, where devices are not allowed.
Online exams are a waste of time, he says, because some students answer with AI.
Berkeley tried Turnitin and Rumi, but found neither good enough to use campus-wide.
Five years ago, Borcherds saw math as one of the safest careers from AI disruption.
Other teachers may copy the in-person exam shift or grade the process, not just answers.
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