Font Weights in Numbers Revision as of Wednesday, 25 November 2020 at 22:00 UTC

Style Weight
Hairline 1
Thin 100
Extra Light 200
Light 300
Semi-Light 350
Regular 400
News 450
Medium 500
Semi-Bold 600
Bold 700
Extra Bold 800
Heavy 850
Black 900
Extra Black 950

There are many lists on the Internet. I’m fine with this one from FontLab.