I saved about $65k this way, having Claude guide me through the process of assuming the (very low interest) mortgage on my house instead of having to refinance it under current rates. When I first contacted the mortgage servicer they said my loan wasn't eligible. I used Claude to do the research citing why my loan did qualify, drafting the letters and request packages with all the supporting evidence, directing me to the proper government complaint portals when the lender still tried to stymie the process. Cost me about 5-6 hours of time over all and will save me >$60k over the course of the loan.