Comment by peteforde

This literally just happened:

Me: I have two bits and need to mill some 5mm aluminum.

A Makera Spiral 'O' - 1/8" shank * 12mm or a carbide 6.35 * 22 * 50

I believe that they are both carbide single flute bits, but the 2nd one seems like it would make short work of 6061.

Claude: The Makera 1/8" single-flute 12 mm is the sensible choice.

The 6.35 × 22 × 50 mm bit may look like it would make short work of 6061, but on a Carvera it is probably the more dangerous choice. It is a much larger cutter, with much more engagement, and it asks more from the spindle, frame rigidity, workholding, and chip evacuation. In a small dry machine, “bigger” often becomes “more chatter and more heat,” not “faster.”

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TL;DR: Claude doesn't seem to have any issue telling me when I'm wrong.