There is a lot of hype about AI taking over the world. I asked the above listed sites to solve an easy puzzle and it didn't get any letter right! It looks like they were trying to match quotes found in the literature. It also tried frequency analysis to no avail. Here is the puzzle:
YXOP TXZWT KNGMKTT SUK CMKHFT HZC GMHLKMT HZC UXGKT XY SUK EXMPAZW GKXGOK.
— UHZP EAOOAHFT
YXOP TXZWT KNGMKTT SUK CMKHFT HZC GMHLKMT HZC UXGKT XY SUK EXMPAZW GKXGOK.
— UHZP EAOOAHFT
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