AI moves fast. New models launch every week, and even people who follow the field closely lose track of which one is cheaper, bigger or better. Modeldle is a free daily quiz that tests how well you're keeping up, and teaches you something new each day. Every day brings 8 click-only questions: which model costs more per token, which has the bigger context window, which ranks higher on LMArena, which coding agent scores best on Terminal-Bench. It covers chat, image and video models and coding agents from dozens of AI labs, and every answer links to its public source. A new deck lands every day at 08:00 UTC, a weekly "This week in AI" deck comes out on Fridays, and the archive lets you replay past days. No signup needed.