Model Architecture: ChatGPT is predicated on the Transformer structure, which uses self-attention mechanisms to process inputs and generates outputs, whereas Google Bard is based on the BERT (Bidirectional Encoder Representations from Transformers) structure, which makes use of a bidirectional transformer to learn contextual representations of text. The key difference between the 2 architectures is that Transformer fashions generate responses from left to right, while BERT fashions generate responses by looking at the whole input sequence.