In inflation models driven by an axion-like particle, the inflaton may have a Chern-Simons coupling to the Standard Model (SM) U(1)_Y. In this talk, we show that this setup is a highly predictive baryogenesis model without further ingredients other than the SM and the inflaton. During inflation, this Chern-Simons coupling sources a dual production of the SM chiral fermions and maximally helical U(1)_Y gauge fields, associated with the SM chiral anomaly equation. The anomalous transport of these primordial chiral asymmetries and the helical U(1)_Y gauge fields after inflation gives rise to the present baryon asymmetry. The observed baryon asymmetry can be reproduced if the Hubble parameter of inflation is around Hinf ~ 10^10 – 10^12 GeV with moderate dependence on inflation model parameters.