  We compute the complete $Q$-dependence of anomalous dimensions of traceless
symmetric tensor operator $\phi^Q$ in $O(N)$ scalar theory to five-loop. The
renormalization factors are extracted from $\phi^Q\rightarrow Q\phi$ form
factors, and the integrand of form factors are constructed with the help of
unitarity cut method. The anomalous dimensions match the known results in
\cite{Badel:2019oxl, Antipin:2020abu}, where the leading and subleading terms
in the large $Q$ limit were obtained using a semiclassical method.
