Developed by US company OpenAI, ChatGPThas taken the internet by storm, winning 100 million users since it came out in November 2022.People can ask the robot to write stories and emails, create recipes（食谱）, translate languages, and answer all kinds of questions. In its own words, it is "a language model trained in [a large amount of]internettext to help users get human-like text. "

Compared with Siri or other chatbots（聊天机器人）, ChatGPTuses a much bigger database（数据库） for training. It also uses stronger software and hardware to learn things by itself. For example, if it provides a wrong answer to your question, you can tell it the right one and it will make corrections. 

OpenAIhas now introduced a powerful new language model: GPT-4.On March 14, 2023, GPT-4 showed the world how smarter it is than GPT-3.5.One of its best new features is that it can understand pictures. 

But GPT-4's developments don't stop there. The new language model can code（用代码编写） classic games in a matter of minutes, It can also change the tone（语气） and style based on what you ask it to do. GPT-4 is much better than the older GPT at passing tests, which may worry teachers. According to CNN, GPT-4 did really well on a law school test, with a score in the top 10 percent of test takers. But GPT-3.5only got a score in the bottom 10 percent.