Supposing we take that as being an actual Gamma Burst, I think at that size you could argue for planet level since that would absolutely core a planet. That's about as far as you could take it though. I gotta say, at this point I kinda want Murata to just cut loose. Have Saitama and Garou start flinging each other across the solar system. OPM has been standing at the edge of the "planet-level lightspeed" barrier for so fucking long now its actually annoying. Have them pass the DBZ threshold and be done with it so we can get back to watching these idiots whack each other