# Day 5: Advanced APIs

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  <img class="date-icon" src="/icons/outline/date-blue.svg" alt="Calendar" />  Day 5 
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# Advanced APIs

Multi‑vector patterns and the Universal Query API.

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## Today’s path

1. Multivectors for Late Interaction Models
2. The Universal Query API
3. Demo: Universal Query for Hybrid Retrieval
4. Project: Building a Recommendation System

You’ll synthesize these APIs into a practical recommendation system.