A: Hello! We use ChatGPT-4 for all rewrite options, except for Magic, Slightly, Structured, and X Post. For these specific rewrites, we use a fine-tuned GPT-3.5 model, as we find that fine-tuning performs better than prompting for these tasks. As soon as new models become available, we start testing them right away and use the ones that perform best to get the highest-quality text.