Some questions about chatgpt api

Hi,I am a plus user of chatgpt.First,I feel appreciated that openAI team has developed the great product which actually save the time to search useful information.But now,I have some questions please.First,I used the official doc API to search my answer,but the reply seemed be different from official website response content.So,Is the api model param different from the website?Second,how to keep the same context by using the SDK?Hope the reply!!