Rebar cutter and bender's and the relative grade range of steel
The International Residential Code (IRC) requires a minimum of 40,000 psi (Grade 40). (See ICC IRC R404.4.6.1)
I think most architects and engineers design for Grade 40 or 50, because they are readily available.
If your working in a high seismic zone or high wind area, they may use a higher grade. Also, commercial work is often Grade 80.