We present an updated version of our standard solar model (SSM) where
helium and heavy elements diffusion is included and the improved OPAL
equation of state (Rogers 1994; Rogers et al. 1996) is used. In such a
way the EOS is consistent with the adopted opacity tables, from the s
ame Livermore group, an occurrence which should further enhance the re
liability of the model. The results for the physical characteristics a
nd the neutrino production of our SSM are discussed and compared with
previous works on the matter.