Generative Pre-trained Transformer 4 is a large language model developed by OpenAI and the fourth in its series of GPT foundation models.
GPT-4 is more capable than its predecessor GPT-3.5 and followed by its successor GPT-5. GPT-4V is a version of GPT-4 that can process images in addition to text. OpenAI has not revealed technical details and statistics about GPT-4, such as the precise size of the model.
An early version of GPT-4 was integrated by Microsoft into Bing Chat, launched in February 2023. GPT-4 was released in ChatGPT in March 2023, and removed in 2025. GPT-4 is still available in OpenAI's API. From Wikipedia
