I've got 10Gbps fiber at home (egregious, I know), and the only OpenWRT router I found that can saturate it is the Turris Omnia NG[0]. The price tag is a notch up from others but it's legitimately one of the best pieces of hardware I've ever owned. A perf3 test against an in-town server was able to pull 800 Megabytes per second; the router is no joke.
If you have a thick line to your ISP, I highly recommend!