Reference the spreadsheet in this thread to get an idea of how Tesla's offered rate compares to banks and credit unions;
https://teslamotorsclub.com/tmc/threads/tesla-loan-comparison-spreadsheet-auto-updates-hourly.
Keep in mind that Tesla is not a bank, they just sub-contract loan applications out to top banks and then make a nice profit on financing if you go through them. Many other auto makers subsidize their loan rates for top credit customers to get the monthly payment down. Tesla does not do this, there is enough demand currently that there is really no need for them to be competitive on financing.