[O/Fe] vs. [Fe/H] for the present results together with the results for bulge giants from Cunha & Smith (2006) and Ryde et al. (2010) are compared to the predictions of the chemodynamical model for the bulge. Panel a): results from the model with ν_SF = 1 Gyr^-1. Panel b): results from the model with ν_SF = 0.5 Gyr^-1. Panel c): the same model as in panel a), but with a top-heavy IMF (x_IMF = 1.05).