What is Meta Andromeda?
Meta Andromeda is the machine learning system Meta uses for ads retrieval, the first stage of deciding which ad a person sees. Meta described it on its engineering blog in December 2024. For each ad opportunity, Andromeda narrows tens of millions of candidate ads to a few thousand, and larger ranking models then choose the final ads. Meta reported a 6% recall improvement and an 8% ads quality improvement on selected segments.
Meta links Andromeda to Advantage+ automation and to creative diversification, saying the focus has shifted from niche targeting to a wider range of creative. Specific rules about how many ads to run, or how different they must look, come from practitioners rather than Meta.
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Sources
- 1.Andromeda is Meta's ads retrieval system, narrows tens of millions of candidates to a few thousand, and improved recall 6% and ads quality 8% on selected segments. Engineering at Meta, Meta Andromeda: Supercharging Advantage+ automation with the next-gen personalized ads retrieval engine. Checked 14 October 2026.
- 2.Meta says the focus has shifted from niche targeting to creative diversification and ties this to Andromeda. Meta for Business, The Creative Advantage: Unlocking the Power of Diversification with Meta Andromeda. Checked 14 October 2026.