1. Purpose: ChatGPT is primarily designed for generating conversational responses and simulating human-like conversations. On the other hand, Bertha is specifically developed to generate unique content and images for websites and presentations.

2. Content Generation: Both systems use powerful language models, but their focus differs. ChatGPT is more suitable for interactive dialogue and chatting, whereas Bertha is built to overcome the blank page syndrome by providing tailored content and relevant visuals for specific purposes.

3. Integration: ChatGPT is often integrated into chatbots and messaging platforms to enable human-like conversations. On the other hand, Bertha is available as a WordPress plugin and Chrome extension, directly integrated with website-building processes.

4. Target Audience: ChatGPT is designed to engage users in conversation and provide information or assistance. On the other hand, Bertha targets website owners, freelancers, agencies, and anyone needing help with content creation.

Both ChatGPT and Bertha have their unique features and applications. Depending on your specific needs, you can choose the one that aligns better with your requirements.