Thanks for asking very knowledgeable question. Yes, ChatGPT can be updated with new knowledge without the need for complete retraining. One way to do this is through fine-tuning, which involves training the model on a smaller dataset that contains new or updated information. This allows the model to adjust its understanding of the new information without having to relearn everything from scratch. Additionally, it is also possible to add new information to the model's knowledge base using external memory or knowledge distillation techniques.