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<p>I know at least 5 in my class. I don’t think it’s that rare. Even 4.9s I think are pretty common. It’s much easier to do this in certain majors than others, though.</p>
<p>One thing that makes 5.0 more common here than say, 4.0 at Harvard is because we don’t have +/-s on the formal transcript. At a normal school with +/- grading, even a single A- can ruin your chances, whereas here you just need to make it into the A range for every class (still, not trivial by any means, however).</p>