The ChatGPT model is based on the GPT-3 model, which has 175 billion parameters. This makes it a very large language model. However, OpenAI often offers several versions of their models, each with different numbers of parameters, for various applications. For example, the GPT-2 model, the precursor to GPT-3, includes versions with 117 million, 345 million, 774 million, and 1.5 billion parameters.
