Meta Andromeda: What Changed for Paid Advertisers

When the Platform Shifts, Performance Shifts With It

When Meta changes how it decides which ads get seen, performance shifts with it, whether you're ready or not. The marketing teams with a process built to handle a shift they didn't see coming are the ones who can hold performance steady.

Meta's Andromeda update is the clearest recent example. At Graybox, we saw paid media performance shift for many of our clients across a variety of industries. The update provided a useful lens for us to examine our own processes and answer a question every paid media leader should ask: when the platform changes underneath your account, what holds your paid performance steady? 

What Changed

For nearly a decade, Meta advertising started with the audience. You defined who you wanted to reach through interests, demographics, or lookalikes, and the platform worked forward from there to decide which ads to show them. Meta introduced a new ad retrieval system called Andromeda in December 2024. Andromeda reverses the advertising order. The system now reads your creative first, then decides who should see it. Targeting moved out of the media buyer's settings and into the ad itself. Creative now does the job that audience targeting used to do. This change resulted in many advertisers seeing performance shifts without making any direct adjustments to their campaigns.

The clearest changes are as follows: 

• Tightly defined lookalike audiences now act as a constraint. Broad targeting paired with strong, varied creative outperforms narrow audience layers in most accounts.
• Creative fatigues faster. The system finds your best-matched audience quickly and exhausts it just as fast. Many accounts now need fresh creative every one to three weeks, down from the old six-to-eight-week norm. Ads that hold up over a longer stretch or run as evergreen content are now the exception.
• Minor variations don't count as new tests either. The system groups near-duplicate ads together and reads a swapped CTA color as the same ad. Real variation means genuinely different hooks, not small tweaks.

Why The Change Felt Sudden

Andromeda wasn't a single, dated launch. Meta described the system in an engineering blog post in December 2024, then rolled it out gradually across accounts, objectives, and placements through 2025, reaching most advertisers by late that year. There was no announcement in Ads Manager, by email, or anywhere else in the product.

Since the update was rolled out in waves with no announcement, the effects of the Andromeda update were hard to pinpoint for our clients. We started to see a trend of creative burning out more quickly and CPA spiking for interest/lookalike audiences that historically have performed well. 

Meta never published a detailed account of what changed for which advertisers, so most of what's been written since is informed guesswork, useful in places, but drawn from individual accounts rather than confirmed by Meta.  

The broad conclusion is that creative now drives targeting. The specifics still vary by budget, industry, conversion volume, and creative history.  

How to Structure Accounts Now

Now that creative has become the targeting, the next question is how to organize it. You can split into themed ad sets to track what's working, or consolidate everything and let the platform sort it. Both approaches have real tradeoffs.

• Many narrow ad sets give you an easier read on what’s working, but fragment the data the system needs. Each ad set has to gather enough conversions on its own to optimize, and a budget spread across a dozen ad sets means none of them learn quickly.
• One consolidated ad set wins on efficiency, since fewer ad sets with diverse creative inside them let the system optimize faster. This comes with some downsides when reporting rolls around. When you load a dozen creatives into one ad set, two or three will often do nearly all the work while the rest barely spend. The system will concentrate delivery on the strongest matches. To a client who paid for a dozen creatives and watched three run, though, it looks like wasted effort, and you lose the ability to explain why one direction worked and another didn't.

Recommended structure: Group ad sets by theme, keep genuinely distinct creative inside each theme so the platform still has room to match, and run a campaign-level budget so the ad spend flows to whichever theme performs. This structure gives you a clear read on which direction is winning while still giving the Andromeda system the variety it needs.

Keep in mind that each themed ad set still needs enough conversion volume to learn, which caps how many themes you can run at once. A couple of well-fed theme ad sets beats many thin ones.

You need to set the expectation with clients before the first report goes out, since creative that doesn't spend is now part of the cost of finding what works. Emphasize that volume and variety are what let the platform identify the winners. 

What Protects Performance Going Forward

These practices apply to paid platforms generally, not just Meta. They'll still work the next time Meta changes how Andromeda ranks ads.

1. Plan for several genuinely different creative concepts per campaign: the system needs distinct hooks to build a signal on.  
2. Consolidate similar campaigns and objectives instead of running slight variations side by side, since splitting spend across them starves each one of the conversion volume it needs to optimize.  
3. Consistently protect the quality of your conversion data. The Andromeda system uses it to decide who sees your ads, and gaps or duplicate events feed it a distorted signal. This is largely true for other advertising platforms.
4. Respect the reporting lag before making budget decisions. Meta's conversion data takes one to three days to settle, so acting on the first day's numbers means acting on an incomplete picture. A budget increase made on early data can swing an account from underspending to overspending within days. Waiting for data to settle before acting can be painful, but it's one of the highest-leverage habits during a volatile stretch.

The Takeaway

Most teams treat a platform update like Andromeda as a one-time fix: learn what changed, adjust the approach, move on. We’ve learned through experience that approach won't hold, because the specific rules will change again, and as the staggered rollout showed, you might not get an announcement when it happens. You'll just see your numbers change.

If your Meta accounts have felt unpredictable since Andromeda rolled out, or you're rebuilding your creative pipeline to keep pace with it, get in touch. We have the process and the team to help.