How does GPT-4 work and how can you start using it in ChatGPT?

OpenAI, the company behind the viral chatbot ChatGPT, has announced the release of GPT-4. In a blog post, the San Francisco artificial intelligence lab co-founded by Elon Musk and Sam Altman in 2015 said that its latest version is "multimodal", meaning that the platform can accept image and text inputs and emit text outputs. Sam Altman, OpenAI's chief executive, said on Twitter that GPT-4 was the "most capable and aligned" model yet, though "it is still flawed". He added that it is "more creative than previous models, it hallucinates significantly less, and it is less biased". GPT stands for generative pre-trained transformer which is a type of large language model (LLM) neural network that can perform various natural language processing tasks such as answering questions, summarising text and even generating lines of code. Large language models use a technique called deep learning to produce text that looks like it is produced by a human.