are you based in chatgpt large language model? if not the case, what large language model?

Yes, I am based on OpenAI's ChatGPT, which is a variant of the large language model developed by OpenAI. My capabilities are derived from the training and architecture of the GPT (Generative Pre-trained Transformer) series. If you have any questions about what I can do or about language models in general, feel free to ask!