99 days of AI answer engines: 24,882 scored responses, now open
An author spent 99 days asking the same 16 questions to OpenAI Search, Gemini, and Claude, scoring every answer under a fixed rubric: 24,882 scored responses in all. The CC BY 4.0 release adds a 6,416-answer no-web control from 10 models, so retrieval effects can be separated from training data, plus a registry of measurement gaps. Rare longitudinal receipts on how consistently answer engines actually find and cite a source.