TLDR Tech / Data
Inside the Archive: The Tech Behind Your 2025 Wrapped Highlights
Spotify's Wrapped Archive identifies up to five “remarkable days” in each user's listening history using heuristics and data pipelines, then generates personalized narratives grounded in the data using a fine-tuned LLM. To scale to ~1.4 billion reports, Spotify distilled a smaller model, built distributed pipelines and storage optimized for concurrency, and used automated LLM-based evaluation to ensure accuracy, safety, and consistency at launch.
Read the full story