CMIP6 data is freely accessible on the Google Cloud Storage. It is maintained by the Climate Data Science Lab at Lamont Doherty Earth Observatory (LDEO) of Columbia University, as part of the Pangeo Project.
Python Users can assess the data using intake-esm. However, the existing catalogs provided by NCAR Intake-esm Datastore is not lastest. Therefore, I updated the catalogs here in cmip_google.