GPT-3 and GPT-4 are advanced AI models that offer more control over text generation compared to ChatGPT, allowing users to explore their capabilities through a web app or API. The Playground offers hands-on access to the API, enabling users to experiment with different parameters such as Mode, Model, Prompt structure, Temperature, Maximum length, Stop sequences, Top P, Frequency penalty, and Presence penalty. By adjusting these controls, users can generate more complex and varied text outputs, including creative writing, dialogue, Q&A, and structured formats. Experimenting with the API's options is crucial to understanding GPT's capabilities and limitations, as reading articles alone may not fully convey their impact.