Compar:IA is a public chatbot arena run by the French Ministry of Culture. People chat with two anonymous models side by side and say which answer they prefer. This dataset is the result. Each row is one turn of a conversation: the two models' answers to the same user message, the preference the user gave on that turn (if any), and the full conversation both answers belong to. The prompts come from real users, most of them writing in French. With 675k response pairs and 208k human preferences over 115+ models, it is one of the larger French preference datasets available for training and evaluating chat models. A user sends a prompt and gets back two answers from two anonymous models. The…