GPT-4, or Generative Pre-trained Transformer 4, is a large multimodal language model created by OpenAI and is the fourth in its series of GPT foundation models. It was released on March 14, 2023, and is designed to accept both image and text inputs and produce text outputs. GPT-4 has been found useful for various tasks such as assisting in coding, content moderation, support, sales, and programming. It has been reported to reduce the time required for certain tasks, such as porting programs from one language to another, and has been used to hunt for trends in medical records. However, it is important to note that GPT-4, like its predecessors, is not fully reliable and can make errors, including "hallucinating" facts and making reasoning errors. Despite its capabilities, it lacks knowledge of events that have occurred after September 2021 and does not learn from its experience. OpenAI has implemented mitigations to improve GPT-4s safety properties compared to GPT-3.5, reducing its tendency to respond to requests for disallowed content and responding to sensitive requests more responsibly.