gpt-4:_how_to_use,_new_features,_availability,_and_more' title='GPT-4: how to use, new features, availability, and more'>GPT-4: how to use, new features, availability, and more.'>GPT-4: how to use, new features, availability, and more'>GPT-4: how to use, new features, availability, and more. OpenAI ChatGPT (GPT-3.5) API error: "This is a chat model and not. Quickstart - Get started using ChatGPT..