Meta Andromeda is the machine learning system Meta uses for ad retrieval: the first stage of delivery, where tens of millions of candidate ads are narrowed to the few thousand that get ranked for one person. Meta described it in a December 2024 engineering post. It has no settings, and the post gives no account-structure rules.
The rules you’ve read about (one broad ad set, dozens of creatives, “creative is the new targeting”) come from two places: Meta’s marketing guidance on creative diversification, and practitioners filling the gaps. This guide keeps the two apart, then turns them into decisions for a lead-gen account, where every data point is an expensive lead.
What is Meta Andromeda, according to Meta?
The engineering post, published on December 2, 2024, calls Andromeda Meta’s “proprietary machine learning (ML) system design for retrieval in ad recommendation”. Retrieval is the first stage of a multi-stage system. Its job is “selecting ads from tens of millions of ad candidates into a few thousand relevant ad candidates”, and larger ranking models then choose what’s actually shown.
The numbers Meta reported are its own measurements: a 6% improvement in retrieval recall from the deployment on Facebook and Instagram, an 8% improvement in ads quality “on selected segments”, and a 10,000x increase in model capacity for more personalised retrieval. The motivation is volume. Meta expects “the number of ads creatives in Meta’s recommendation systems” to “grow significantly” as advertisers adopt generative AI tools, and Andromeda’s hierarchical index is built to handle that growth.
A Meta for Business post from March 2025 places Andromeda among four AI systems in Meta’s ads stack, next to GEM, Lattice and sequence learning. It calls retrieval “the first step in the ranking process” and adds the line that matters to advertisers: as businesses upload more creatives to support a diversification strategy, Andromeda helps Meta “pick the right creative” for each person.
What the engineering post doesn’t contain matters just as much. There’s no advice to advertisers, no number of ads per ad set, no campaign structure and no rollout calendar.
Is there a Meta Andromeda update in 2026?
Meta’s posts on Andromeda don’t give a date for one. The March 2025 post says Andromeda was introduced in 2024, and the December 2024 engineering post already reports results from Facebook and Instagram. If an article gives a 2025 or 2026 date for “the Andromeda update”, that date doesn’t come from either source. Meta does keep changing its ad systems (the same March 2025 post describes GEM being rolled out more broadly), but from inside one ad account you can’t pin a change in your results on any one of them. Restructure when your own numbers give you a reason to.
Meta Andromeda and creative diversification: what Meta says
Meta has said far more about creative diversification than about Andromeda itself, mostly in marketing posts rather than documentation. In date order:
- November 2024. A Meta for Business post on creative diversification tells advertisers to launch new ads every week and says: “As a best practice, we recommend maintaining at least 20 diversified ads in Advantage+ shopping campaigns and dedicating 20-30% of your overall ad budget towards testing new ads.” The context rarely travels with the number: Advantage+ shopping campaigns (now Advantage+ sales campaigns), e-commerce, holiday season.
- April 2025. A second post ties diversification to Andromeda by name. It defines creative diversification as “creating a wide range of ad creatives with different themes, messages, and visuals to cater to diverse audience segments”, and states that “the focus has shifted from niche targeting to creative diversification as the best lever to find the most relevant audiences.” More creative volume means Meta’s system “must process more information when determining who to show an ad to”, which is the work Andromeda does.
- Undated, still live. Meta’s creative differentiation guidance explains what happens when creatives look alike: “When creative is too similar, our system may not recognize it as different and could deliver it to the same sets of audiences. This overlap limits your reach and ultimately leads to Creative limited or Creative fatigue status.”
- Help Center. The article on managing ad volume pulls the other way: “When an advertiser runs too many ads at once, each ad delivers less often”, fewer ads exit the learning phase, and “too many ads can result in worse performance.” Its advice is to decrease ads per ad set “but maintain diverse creative assets per ad set”.
- September 2026. Asked by Marketing Brew, a Meta spokesperson called diversification a “longstanding best practice as we see it deliver measurable results”, said the guidance is “deliberately outcome-based (not model-specific)”, and added: “We don’t get into the specifics of how our ranking models represent individual creative assets.”
In a lead-gen account those two halves collide. Diversity needs ads, and every ad needs leads before anyone, Meta included, can learn from it.
What practitioners infer from Meta Andromeda
Agency posts and forum threads have turned Andromeda into rules. Some are reasonable, some are guesses:
- “One campaign, one broad ad set.” Reasonable, but its best support predates Andromeda: Meta’s learning phase guidance says that “by combining similar ad sets, you also combine learnings.”
- “Creative is the new targeting.” Meta said a version of this itself in April 2025. The stronger version, that audience settings no longer matter at all, is the practitioners’ own.
- “You need 20, 50, 100 ads.” No Meta source says this for lead gen. The one Meta number is the Advantage+ shopping figure above, and the Help Center warns against high ad volumes.
- “Similar ads are grouped under one entity ID.” Meta confirms the general effect (too-similar creative may not be recognised as different) but not the mechanics, and its spokesperson declined to describe them. Similarity scores and percentage thresholds you see quoted are vendor claims.
- “Winning ads fatigue faster since Andromeda.” Anecdotal. It’s consistent with Meta’s warning about similar creatives, but nobody outside Meta can isolate Andromeda as the cause.
The questions on forums are more practical. Two r/FacebookAds threads from 2025 sum up the confusion. One advertiser asks whether to split campaigns by country or go global, and whether to use ad set or campaign budgets. Another, running lead gen for local services, asks how to scale when Meta keeps pushing creative diversity and winning ads seem to wear out sooner. The next sections answer both for a lead-gen account.
Meta says, practitioners infer, what to do
| Topic | Meta says | Practitioners infer | What to do in lead gen |
|---|---|---|---|
| What Andromeda does | retrieval: narrows tens of millions of ads to a few thousand per person (December 2024) | it’s “the new algorithm” and decides everything | treat it as one stage; your optimization event, budget, creative and landing page still set the CPL |
| Targeting | the focus “has shifted from niche targeting to creative diversification” (April 2025) | interests are dead, go broad everywhere | start broad or with Advantage+ audience; keep only real constraints, such as the area you serve |
| Structure | combining similar ad sets combines learnings; with many ads and ad sets, each learns less (Help Center) | one campaign, one ad set, dozens of ads | as few ad sets as your budget can feed with about 50 leads a week each |
| Number of creatives | at least 20 diversified ads in Advantage+ shopping campaigns (November 2024); avoid high ad volumes (Help Center) | 20 to 50+ ads per ad set, new ones every week | as many distinct concepts as your budget can take to about 10 leads each |
| Similar creatives | too-similar creative may not be recognised as different and can end in Creative limited or Creative fatigue | “entity IDs” and similarity thresholds | vary the concept, hook, format and person on camera; colour swaps count as one ad |
| Measurement | Meta picks the creative for each person | Meta’s cost per result per ad is the verdict | read real CPL per creative × landing page, on leads you received |
How to structure a lead-gen account for Andromeda
Lead gen feels one constraint more than e-commerce does: the optimization event is expensive and rare. Meta’s learning phase guidance says an ad set usually needs about 50 results in the week after its last significant edit to exit learning, and for you a result is a lead. At a €40 CPL, that’s €2,000 a week per ad set.
Meta turned this into a formula in its October 2026 peak-season guidance:
Total weekly budget ÷ (cost per result × 50) = the most ad sets your budget can support
Example: a solar installer spends €3,000 a week at a €30 target CPL. 3,000 ÷ (30 × 50) = 2, so two ad sets at most. A structure that fits:
- One campaign, optimized for leads at the conversion location you use. If you run both Instant Forms and landing pages, give each its own ad set and compare them on qualified leads, as covered in Facebook lead ads vs landing pages.
- One or two ad sets with a broad audience or Advantage+ audience, limited to the area the installer serves.
- Four to six ads per ad set, each a different concept, each pointing to a landing page that repeats its promise.
- New concepts added in batches, because Meta treats adding an ad as a significant edit that restarts the learning phase.
Split into more ad sets only where something real differs: a second country with its own landing page, an offer with a very different CPL, a different conversion location. For languages, Meta’s ad volume article suggests setting several languages in a single ad set instead of one ad set per language.
Ad set budget or campaign budget? With one or two ad sets, the choice matters less than the threads suggest. Meta’s article on significant edits says that with Advantage+ campaign budget, ad sets don’t re-enter learning as budget is distributed between them, and adding an ad set doesn’t send the others back into learning. Use ad set budgets when a segment needs guaranteed spend, such as a second country you want to test properly.
The more creatives Meta chooses between, the more you need the real CPL of each one and of the landing page behind it. DropCPL syncs spend per ad from the Meta Ads API and counts leads on your own landing pages, so every creative × landing page pair gets a CPL from leads you actually received. Start free →
Andromeda creative strategy: testing when Meta picks among many
Diversify at the level of the concept. For the solar installer, five concepts that would reach different people (example):
| Concept | Hook | Format | Landing page |
|---|---|---|---|
| The bill | “What our customers paid for electricity last winter” | static with a before-and-after bill | savings estimate |
| The incentive | “Check if your roof qualifies for the regional grant” | carousel | grant eligibility check |
| Blackouts | “The street went dark. Their fridge didn’t.” | 15-second video | battery quote |
| The neighbours | “Three installs on your street this year” | talking-head video | local installs and quote form |
| The survey | “A 20-minute roof survey by video call” | static | booking form |
Then test them with four habits:
- Low spend isn’t a verdict. Meta’s delivery decides which ads get the budget. Its Help Center says that when one ad gets few results while others in the same ad set get more, “that’s okay. The ad delivery system predicts which ads will generate the best results.” An ad that spent €40 hasn’t lost. It hasn’t been tested.
- Fund tests in multiples of your target CPL. Screen at 3× the target CPL, rank at 10×, and call winners only among finalists. The Meta ads creative testing framework has the full rules and the noise math.
- Give each concept its own ad. Meta’s ad volume advice is to put several creative assets into one ad. That works for delivery, but every lead from that ad arrives with the same ad ID, whichever asset the person saw, so your own data can’t split the CPL by concept.
- Vary more than the words. Meta’s warning about similar creative applies to near-copies: the same footage with a new caption may still read as the same ad. Change the opening visual, the format or the person on camera.
Why real CPL per creative and landing page matters more now
More creatives on the same budget means fewer leads per creative. Example: €3,000 a month at a €30 CPL buys about 100 leads. Spread over 20 live creatives, that’s five leads each on average, and Meta won’t spread them evenly. Five leads can’t rank anything. Over five concepts it’s 20 each: enough to start ranking.
The count you rank on matters too. Meta counts results under your attribution setting, so its cost per result per ad rests on Meta’s attributed count, which won’t match the leads you received. Rank creatives on your own lead count; real CPL vs platform CPL explains why the two numbers never match.
Then there’s the landing page. Andromeda chooses which creative a person sees, and the landing page behind it is your choice. Each concept brings a different kind of visitor, and the same landing page converts them at different rates. Example, CPL per pair:
| LP 1: savings estimate | LP 2: grant eligibility check | |
|---|---|---|
| Ad “The bill” | €24 | €38 |
| Ad “The incentive” | €41 | €22 |
Judged on LP 1 alone, the incentive concept looks like a loser. Paired with the landing page that keeps its promise, it’s the cheapest cell in the table. That’s the pattern how to read the attribution matrix teaches you to spot before you cut anything.
Concepts also wear out at different speeds, and a winner from March can be your most expensive ad by May. Creative fatigue in Meta ads covers how to tell when one has.