1. The question asks about the version of GPT I am using. 2. I am an AI language model based on OpenAI's GPT-4 architecture. 3. This means I use the fourth generation of the Generative Pre-trained Transformer model. 4. My knowledge cutoff date is June 2024, so I have information up to that time. Final answer: I am based on GPT-4 architecture with knowledge up to June 2024.