In a wide class of holographic models described by the Yang-Mills and Chern-Simons terms, we derive all the ${\cal O}(p^6)$ Chiral Perturbation Theory low-energy constants. Various model-independent relations exist among the constants up to this order, generalizing the previously found relations at $p^4$ order. Some of them can be extended to relations between different amplitudes.

6 pages, contribution to the poster section of QCD@Work 2012 --International Workshop on QCD: Theory and Experiment--, 18-21 June 2012, Lecce (Italy)