ChatGPT is one of the language models developed by OpenAI, specifically designed for generating conversational responses. Compared to other models like GPT-3, ChatGPT is fine-tuned to excel in interactive dialogue scenarios and provide more contextually relevant answers. It has been trained using Reinforcement Learning from Human Feedback (RLHF) to improve its conversational abilities and generate more engaging responses. While GPT-3 can also handle conversational prompts, ChatGPT is optimized for this specific use case and provides more conversational depth and coherence.