OpenAI's GPT, which stands for Generative Pre-trained Transformer is currently one of the most talked about technologies ever. This AI chatbot that has taken the internet by storm is the lifeblood of ChatGPT. OpenAI has been fast-tracking its progress on its Large Language Models or LLMs. It debuted GPT-4 on 14 March this year, just four months after GPT-3.5 was launched alongside ChatGPT.