The ChatGPT desktop app appears to have the same capabilities as the web version. Although you'll encounter a simplified user interface, you can switch easily between GPT-3.5, GPT-4, and GPT-4o just as you do on the website. The sidebar doesn't appear by default, but clicking the sidebar icon at the top of the screen makes it visible. The desktop app lets you upload files and images, have voice conversations, and ask for AI-generated images.