Canon R5 has a Canon RF lens mount and currently there are 39 native lenses available for this mount.
The latest released lenses that are compatible with the R5 are the Canon RF 28mm F2.8 STM, the Canon RF 100-300mm f2.8 L IS USM and the Canon RF 24-50mm F4.5-6.3.
R5 also has a sensor based image stabilization system that is up to 8.0-stops effective which means that all of these lenses will be stabilized when used on the R5.
Since Canon R5 has a Full frame sensor, it has a focal length multiplier of 1x so lenses will provide their original focal length on R5.
You may also also be interested in these:
Canon R5 Lenses with Image Stabilization
Canon R5 Lenses with Weather Sealings