Top Free Zero Data Retention Long-Context AI Models

The best free zero data retention long-context AI models right now, ranked by the Epoch Capabilities Index when one is published, then by launch date. 3 models match. These are models you can use at no cost, either through a free tier or because they are priced at zero, and models offered by at least one provider with zero data retention, meaning your prompts and replies are not stored or used for training, and models with a context window of 1 million tokens or more, enough for several books at once.