One simple way of predicating short-term stock price is to simply take the average price of the previous few days.
I wonder if there is some AI model/methods which can do better than this using only previous prices as input?
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Attempt-wise, yes. All big players (e.g. J.P. Morgan) in the stock market who do automatic trading utilize reinforcement learning systems, which may contain components for short-term prediction.
But as @miguelmorin commented, if a simple algorithm ever exists, it would be so widely adopted until any gain from it disappear - that is, totally wrong predictions.
AFAIK, in long run, the only winners in short-term trading are those who can hire dozens of experts to build reinforcement systems, which are hosted on multi-million hardware, listening to thousands of market signals coming in from dark fibers 24/7, plus algorithms which can digest and place orders in less than 1 second (perhaps faster than our eyes seeing a price and our brain perceiving it). So, good luck!