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As @ImTheDevil alluded to, there are a variety of FICO scoring models for different purposes (mortgage, auto loan, etc.). The places where you get you FICO scores for free generally show what's known as FICO 8. If you are planning on getting a mortgage, you might want to pay for you full suite of 24 scores (8 models times 3 credit bureaus) so you can focus on the mortage ones.