One link to "https://longcat.ai/chat/" is provided, which eventually redirects you to https://passport.mykeeta.com/pc/login, did the UI get hacked or something? I went to mykeeta.com which doesn't respond, passport.mykeeta.com serves OpenResty's default page, not sure what's going on but looks strange.
Asking "Hello?" in the chat you get "你好！我是 LongCat，美团研发的大模型助手。有什么可以帮你的吗？" back, which is an explanation what LongCat is in Mandarin. If you then write "What?", it does web-searches trying to explain what "What?" means, in Mandarin.
I'm not really sure this is ready to even be played around with yet. Some more basic prompts seems to tell me that despite the benchmark results, it's fairly dumb, so gut tells me this is benchmaxxed then pushed out as quickly as possible.