Calibrated large language models demonstrate a consistent advantage in a randomized longitudinal medical education intervention

Medical trainees increasingly use large language models to review lecture material, but the educational value of that output depends on how it is generated, with prompt and model choice rarely measured. We tested a calibrated pipeline converting Neurology Grand Rounds recordings into summaries and quizzes in a year-long randomized study. In Phase 1, six summary and six question prompts across two models were scored with 2,692 rubric annotations. Claude Prompt 0 produced the best summaries (composite 76.9%) and GPT Prompt 1 the best questions (79.6%); quality varied widely by prompt, and neithe

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