Meta Andromeda: Meta's Next-Gen Ads Retrieval Engine Hits 1B Ads per Second

Meta detailed the next generation of Andromeda, its personalized ads retrieval engine, which scores over one billion ads per second in production — a 100x throughput lift over the 2024 system. The new architecture brings LLM-inspired mixture-of-experts to retrieval, approaching ranking-level model performance at roughly 300x fewer inference-time FLOPs, with over 10 billion ads per second on a single NVIDIA GH200 GPU. Since 2025, Andromeda has delivered a 2.4% increase in conversions on Facebook.