Which AI Models Actually Keep Your Secrets Private

Claude, ChatGPT, and other consumer AI tools have radically different data retention and training practices depending on which version you pay for—a distinction most users don't understand when they paste sensitive information into the free tier. Your choice of model and subscription plan directly determines whether your inputs become training data, stay on servers indefinitely, or get deleted. This creates a hidden stratification in AI privacy that mirrors social media's free-vs-paid tiers, but with less transparency.