  We compute the semi-classical potential arising from a generic theory of
cubic gravity, a higher derivative theory of spin-2 particles, in the framework
of modern amplitude techniques. We show that there are several interesting
aspects of the potential, including some non-dispersive terms that lead to
black hole solutions (include quantum corrections) that agree with those
derived in Einsteinian cubic gravity (ECG). We show that these non-dispersive
terms could be obtained from theories that include the Gauss-Bonnet cubic
invariant $G_3$. In addition, we derive the one-loop scattering amplitudes
using both unitarity cuts and via the leading singularity, showing that the
classical effects of higher derivative gravity can be easily obtained directly
from the leading singularity with far less computational cost.
