ByteDance's SequenceO1 enables Douyin to analyze 100K user interactions for recommendations

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ByteDance has deployed a new AI model called SequenceO1 on its Douyin platform. The system compresses a user's entire 100,000-interaction viewing history into a compact, fixed-size summary. This allows the recommender to consider a user's long-term tastes efficiently, replacing a previous two-stage process. The approach is significantly cheaper to train and serve than previous methods. The model was detailed in a September 2026 research paper and is now running at full traffic.

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