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We discuss a possible interpretation of the $750$ GeV diphoton resonance,recently reported at the LHC, within a class of $SU(2)_L\times SU(2)_R\timesSU(4)$ models with gauge coupling unification. The unification is imposed bythe underlying non-commutative geometry (NCG), which in these models isextended to a left-right symmetric completion of the Standard Model (SM).Within such \textit{unified} $SU(2)_L\times SU(2)_R\times SU(4)$ models theHiggs content is restrictively determined from the underlying NCG, instead ofbeing arbitrarily selected. We show that the observed cross sections involvingthe $750$ GeV diphoton resonance could be realized through a SM singlet scalarfield accompanied by colored scalars, present in these unified models. In viewof this result we discuss the underlying rigidity of these models in the NCGframework and the wider implications of the NCG approach for physics beyond theSM.

The 750 GeV diphoton excess in unified $SU(2)_L\times SU(2)_R\times SU(4)$ models from noncommutative geometry