This document is OpenAI's system card for its new o1 large language model series. The card details the models' training data, which includes both public and proprietary sources, and rigorously implemented data filtering. Extensive safety evaluations were conducted, focusing on disallowed content, jailbreaks, hallucinations, and bias, showing improvements over previous models like GPT-4. External red teaming efforts also assessed the models' safety and identified some new risks associated with the increased reasoning capabilities. Finally, the document outlines preparedness framework evaluations across various risk categories, concluding with an overall medium risk classification for o1.

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