I got curious and gave GPT and HY3 the exact same prompt: plan a 3-day trip to Hangzhou. First impression? GPT is much easier to read. And both covered the basics like Alipay and DiDi, so I didn't think there was much difference. Then I sent both itineraries to a friend from mainland China. His first reply: "Grandma's Home? I'd skip His second: "The second one even warned you about the tea scam near West Lake. It knows too much." That's when things got interesting. It ma...