Meta Ads Deep Analysis

Andromeda + GEM + Lattice (2026)

Meta's delivery stack was rebuilt across three releases:

• Andromeda (Oct 2025) — ad-retrieval ranking model with 10,000× more model capacity than the previous funnel (Meta Engineering, Dec 2024). Filters the candidate creative set before the auction layer ever sees it.
• GEM (Generative Embedding Model, late 2025) — replaces the feature pipeline. Creative content embeds directly into the targeting space, which is why "creative is the new targeting" is now mechanical truth not slogan.
• Lattice (rolled out late 2025 / early 2026) — sequence-aware optimizer on top of GEM that uses user-action sequences to rank candidate ads.