Go's GC is not currently generational. As others have mentioned, Go gives you more control over memory which helps considerably.

If you want to know more about the current progress, there is a great presentation -> blog here: https://blog.golang.org/ismmkeynote

And you can see the most recent generational GC code here: https://go-review.googlesource.com/c/go/+/137482

Though my guess is it won't get merged into mainline for Go1.13 as it is already in code freeze.