  We study unification in the SU(5) model with an extra Dirac multiplet in the
${\bf 24}$ representation. After spontaneous symmetry breaking we have at low
energies a singlet, a colorless triplet and a neutral color-octet. All other
particles can be taken at the unification scale. This combination leads to a
unification very near the Planck scale. The triplet is light, its neutral
component is a dark matter candidate. The model is in agreement with a recently
derived anomaly condition, that implies that the number of (Weyl)-fermions has
to be a multiple of 16.
