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abstract: "Groundtruth Dynamic Benchmarking is an Earth Sciences AI benchmark: it evaluates how well large language models reason over real geoscience source material such as mineral-exploration reports, government geological archives, and technical filings. A candidate model answers a fixed question set drawn from primary records; an independent LLM judge grades every answer 0-10 against a calibrated, source-anchored rubric whose every claim carries a verbatim evidence locator. Geology is the first edition; the harness runs any schema-2.0 rubric. A public leaderboard hosts a model track and a harness track over three 50-question districts."