Shader Model and features

2.5: derivatives
3.0: 2.5 + interpolators10 + samplelod + fragcoord (also contains fragdepth)
3.5: 3.0 + interpolators15 + mrt4 + + integers + 2darray + instancing
4.0: 3.5 + [mrt8] + geometry
4.5: 3.5 + compute + randomwrite (so it means it has no 4.0 features)
4.6: 4.0 + [cubearray] + tesshw + tessellation (so it means it has no 4.5 features)
5.0: 4.0 + 4.5 + 4.6 + [interpolators32] (it has everything)

[Pink] : Mobile won’t implies it

info from @Aras

Official documentation about shader model supports for different Graphics APIs:
https://docs.unity3d.com/2021.2/Documentation/Manual/SL-ShaderCompileTargets.html