Users can choose between using GPT-3.5 or GPT-4

The user center can be developed in a different way, where the user has their own wallet, and the management can set the amount of credit users receive after registering. For example, new users could receive 100 points upon registration. Each time AI is asked a question, it will automatically deduct from the user's wallet. Users can choose between using GPT-3.5 or GPT-4, and the cost of each API will differ. Users only need to recharge their wallet with points."