What are the different AI models?

Each AI character is powered by an AI model, and AI models differ in how well they write. Open the chat menu, tap Models, then Switch model. Nexus Core is free and good for everyday chat; Nexus Boost and Nexus Ultra write noticeably better and cost credits per message. Tags on each AI model say what it is good at, and tapping a tag above the list shows only the AI models that have it. Your choice is remembered for each conversation.