Which of the following is an example of a language model?

A language model is designed to understand and generate human language, making it possible to engage in conversations, predict text, or complete sentences based on the input it receives. ChatGPT exemplifies a language model developed by OpenAI, which utilizes deep learning techniques to generate human-like text responses based on the context provided by users.

The other options represent different types of models and systems that serve distinct purposes. Diffusion models are primarily used in the context of generating images, often dealing with noise and patterns in data. Image recognition systems focus on identifying and classifying objects within images and are not designed for language-based tasks. Video analysis tools are developed to analyze and interpret video content and movement rather than handle text or language. Thus, ChatGPT stands out clearly as an example of a language model due to its specific functionality in processing and generating human language.