As I understand it, most commercial soy beans are GMO varieties. I have not checked into it, but would doubt that the home garden varieties are GMO, especially any that would be offered by Seed Savers Exchange.
"Also referred to as vegetable soybeans, edamame is
the same species as the traditional grain soybean
(Glycine max) commonly grown in Kentucky.
However, compared to grain soybean, edamame
seeds are larger with a sweet, nutty flavor, and
better digestibility. "
Above excerpt from University of Kentucky publication:
https://www.uky.edu/Ag/CCD/introsheets/e ... auto,0,797
Eclectic gardening style, drawing from 45 years of interest and experience. Mostly plant in raised beds and containers primarily using intensive gardening techniques.