GPT (Generative Pre-trained Transformer) is an AI model developed by OpenAI, designed to generate human-like responses to text-based prompts. It's a family of models that can be used for various applications such as answering questions, generating content, editing text, summarizing long passages, translating text, brainstorming ideas, and creating images. GPT has been widely adopted in various industries, including Microsoft, Sudowrite, Duolingo, Zapier, and others, using its API to power their AI capabilities. The model was trained on vast amounts of unlabeled data and uses a deep learning neural network with 175 billion parameters to understand patterns and relationships in text data. GPT is designed to align with human values and follow human intent, making it safer for use. Developers can try GPT through various tools such as ChatGPT, OpenAI playground, AI writing generators, and Zapier, which integrate with the model's API to provide a range of features and functionalities.