What is Meta Andromeda and how does it affect your ads?

What is Meta Andromeda?

Meta Andromeda is the machine learning system that runs the first stage of Meta's ad delivery. For each person, it picks a few thousand candidate ads out of tens of millions. Meta announced it in December 2024. The practical consequence for advertisers: your creative, more than your targeting settings, now decides who sees your ads.

According to Meta's engineering blog, Andromeda improved recall in the retrieval stage by 6% and ad quality by 8% on selected segments. It was built specifically to handle the fast-growing volume of creative coming from Advantage+ and generative AI tools. That detail matters, because it tells you what Meta expects from advertisers: more creative, and more varied creative.

How did Andromeda change ad delivery?

Showing an ad on Meta happens in two steps. First, retrieval narrows the huge pool of ads down to the ones that might suit a given person. Then ranking models decide which of those candidates wins. Andromeda is the engine behind the first step.

Ranking has changed too. Meta's large ads model, GEM, passes what it learns on to the ranking models. Meta reported that GEM increased ad conversions by 5% on Instagram and 3% on Facebook Feed in Q2 2025. Put the two together and the picture is clear: the system works out who will care about an ad from the content of the creative itself.

Here's how that shift shows up in account management, based on what we see in the accounts we run:

Area	Old habit	What works in the Andromeda era
Targeting	Narrow interests, many audiences	Broad targeting or Advantage+ audience
Account structure	A separate ad set for each audience	Fewer campaigns and ad sets, consolidated budget
Creative variation	Same image with different colours and headlines	Genuinely different concepts
Number of creatives	3 to 6 ads per ad set	More, but each from a different angle
Testing	Audiences competing in separate ad sets	Concepts competing within the same structure

What does creative diversification mean?

Creative diversification means producing ads that are clearly distinct from one another, each explaining the same product to different people for different reasons. Two versions of the same photo on blue and red backgrounds don't count. You need a different message, a different format or a different kind of customer.

There's a pattern we see often. An advertiser uploads five ads that look almost identical, nearly all the spend goes to one of them, and the rest barely get impressions. The conclusion is "we tested it and it didn't work." But the algorithm was never given a choice. It was given five copies of the same ad.

For an example women's shoe brand, five genuinely different concepts might look like this:

1. A studio product video showing the materials and stitching up close.
2. A customer's phone-shot try-on video: "I was on my feet all day in these."
3. A simple static ad built around the offer: free shipping and free returns.
4. A problem and solution angle aimed at people with heel pain.
5. A carousel of real customer reviews.

The third one is easy to underrate. Practical buying details such as shipping speed, returns and payment options often decide the sale, and as a standalone concept they find their own audience.

How should you structure campaigns after Andromeda?

Here's the order we'd follow when rebuilding an account:

1. Consolidate. Merge campaigns that serve the same goal. When budget sits in fewer ad sets, the system learns faster.
2. Broaden targeting. Drop narrow interests and start with broad targeting or Advantage+ audience. The creative will do the selecting.
3. Think in concepts. Give each ad set at least 4 to 6 distinct concepts, and put variations underneath them.
4. Mix formats. Video, static, carousel and catalog ads should sit in the same structure.
5. Test Advantage+ creative enhancements. According to Meta's documentation, the feature creates multiple variations from a single creative and shows each person the one they're most likely to respond to. Switch off individual enhancements that don't fit your brand.
6. Put production on a schedule. Add at least one new concept every two weeks and remove ads that get no spend or underperform.

Our guide on how to test Meta ad creatives the right way covers which metrics to compare them on.

Has Andromeda made targeting pointless?

No, but targeting has a different job now. It used to be the main way to get an ad in front of the right person. Today it works more as a set of boundaries. Keep defining real business constraints such as country, language and age limits. If you can't sell to under-18s or only ship to certain countries, those settings stay.

Excluding existing customers still makes sense too. In a campaign meant to win new customers, leaving out people who bought in the last 180 days means the results you measure really come from new buyers. Skip that, and you may be paying to reach people who would have bought anyway, then calling it growth.

What you should drop are narrow builds like "ages 25 to 34, interested in yoga and organic food." They shrink the space where the system can find your best buyers and often push costs up.

Why might Andromeda have hurt your performance?

If your costs have become volatile, the problem is usually not the system but an account that doesn't fit how it now works. Three signs give it away. First, most of the spend goes to a single ad whose frequency climbs fast. Second, the account is split into dozens of small ad sets and none of them exits the learning phase. Third, the same two or three creatives have been running for months.

None of these is fixed by creative alone. Healthy Pixel and Conversions API data, a landing page that converts and an accurate margin calculation matter just as much. For example, for a textile brand where we reached a 32.04 ROAS, the result came from funnel optimisation, audience segmentation, creative production and data-driven optimisation working together, not from one winning ad. The full numbers are in our case studies.

How can small-budget brands adapt to Andromeda?

A small budget doesn't have to mean little creative. Example: a brand spending around $1,000 a month can start with a single sales campaign and one ad set. It puts 6 to 8 different concepts inside and adds 4 to 6 new creatives a month. Most of these don't need expensive production. A phone-shot demo, an image built from customer reviews or a 20-second founder video can outperform a studio shoot.

To be honest about the limits: on a small budget, not every concept will gather enough data. So make decisions on groups of concepts rather than on individual ads. Knowing which message wins is worth more than knowing which image wins.

If you want to understand why your account is struggling in the Andromeda era, the Performetic team can review your campaign structure and creative mix with you. Ask for a free growth analysis.

Key takeaways

• Meta Andromeda selects candidate ads for each person from tens of millions, and was announced in December 2024.
• Targeting carries less weight; the content of the creative largely decides who sees the ad.
• Creative diversification isn't changing colours; it's producing concepts that speak to different messages, formats and customer types.
• Consolidate the account, broaden targeting and keep genuinely different concepts in each ad set.
• Creative alone isn't enough; measurement, landing pages and margin matter just as much.