The biggest change in Meta advertising since iOS 14
Meta has launched its biggest system update since iOS 14: Andromeda. If your Facebook or Instagram advertising has behaved unpredictably over the past year, this new algorithm is most likely the reason.
But what exactly is Andromeda – and what does it mean for your digital advertising work?
What is Meta Andromeda?
In December 2024, Meta announced its new retrieval engine, Andromeda. The system was rolled out globally throughout 2024 and fully implemented around October 2025.
In short, Andromeda acts as the first step in Meta’s ad delivery system: when a user is shown an ad, the system may need to select from millions of options. Andromeda narrows this down to a few thousand candidates in just milliseconds. Other parts of Meta’s ad engine then choose the final ad.
Meta has built Andromeda on significantly more powerful hardware than before. This has increased the complexity of the models evaluating ads by a factor of 10,000. This is not just fine-tuning – it is a fundamental and radical technological upgrade. To repeat: a 10,000x increase in the complexity of the models used to select ads!
Why did Meta need Andromeda?
The short answer: Meta simply couldn’t keep up anymore.
Think about it: with Advantage+, which can generate 10 new ads for every one you upload, a single campaign can quickly end up with thousands of ad variations, different backgrounds, texts, placements and formats. The old system couldn’t handle it.
The explosion of creative variation made the old engine insufficient. Andromeda was built precisely to manage this complexity – while still making decisions in real time.
After launch, many advertisers saw performance drops and declining results. Many assumed Andromeda was “breaking” their ads, but the truth is more nuanced: Andromeda didn’t change targeting or the advertising logic – it changed the rules of the game. Strategies that worked in 2024 no longer work in 2025 or 2026, and anyone who ignores this shift will face major challenges.
The old rules no longer work…
Before Andromeda, most advertisers structured their campaigns with small, narrow audiences, 4-5 ads per ad set and minimal creative variation (e.g., changing one color or one headline).
The algorithm would quickly find one “winner” and allocate the budget to that single ad, while others barely served. With Meta’s new system, you could argue this was never optimal, but it worked back then. Now it doesn’t. Under Andromeda, this approach isn’t just inefficient – it actively harms performance.
The Andromeda Era: How you should advertise now
1. Creative diversity is essential
Meta and leading global advertisers highlight one thing: create many different ads – not just variations, but fundamentally different concepts. Where you previously built 4–5 ads, today you should create at least 20 – but meaningfully different ones.
Andromeda is extremely good at understanding visuals. It uses Convolutional Neural Networks (CNNs) to read signals like colors, composition, environment, product angles, style and types of people. That means ads that look different to us may still be categorized as identical if they share too many visual similarities.
To fully leverage Andromeda, create real visual variety:
- Different concepts (problem–solution, pain points, testimonials, product demos)
- Different formats (short videos, long videos, images, carousels)
- Different personas and angles
- Different locations and environments
- Different creators and faces
- Different visual styles (minimalist, lifestyle, close-up, wide shot, color palettes)
It’s not about making 20 versions of the same ide – it’s about 20 different concepts.
2. Consolidate your campaigns
If your Ads Manager is a long list of nearly identical campaigns, it’s time to reorganize. Andromeda needs dense data. A large number of similar campaigns with fragmented budgets weakens the algorithm’s learning.
Your 2026 approach should be one campaign per objective, with budget set at the campaign level via CBO (Campaign Budget Optimization), letting the algorithm allocate spend to the best-performing ads.
3. Use broad targeting
This feels counterintuitive, but Andromeda works best with broad targeting: Open age ranges, wide geographies, minimal interest-based segmentation. Why? Because targeting now happens primarily through your creative.
When you produce varied creative tailored to different personas and pain points, Andromeda automatically matches each ad with the right users.
Now, your ads are your targeting.
4. Be patient
Where you previously could evaluate an ad’s performance after a few days, Andromeda requires more time to learn which ads work for which users. Depending on your budget, you should give it 5–7 days before deciding whether an ad should be paused or continued.
Here, it’s important that you focus on monitoring the overall performance of your ad set, not the individual ads. Some ads may not get many direct conversions, but they improve the campaign’s overall performance when active. Andromeda optimizes the mix, not just individual ads.
Maybe one ad captured attention, and another secured the sale for the same user. This is called Assist-impact: ads that indirectly lift the overall effectiveness of your campaign.
What about the practical metrics? How do you measure your results?
In the Andromeda era, budget allocation can tell you more than conversion numbers. If Andromeda sends a lot of budget to a particular ad, it means it has found the right audience – a strong audience match. Stability over time is valuable: you’ve hit a sweet spot if ads maintain steady spend and performance over longer periods.
Measuring assist-impact is therefore also crucial – some ads may not drive direct sales, but instead lift the entire campaign’s performance. Make sure to cover top-, mid-, and bottom-funnel, and never leave the top unused so users don’t flow down through the funnel.
5. Creative production matters more than ever
ROAS is still a primary metric, but use these new signals for a deeper perspective.
Remember the human factor: Andromeda does not create good ads on its own. If your creative material is weak, the algorithm will simply deliver it to a broader and less qualified audience. Quality and creative diversity are more important than ever.
What does this mean for marketing leaders?
Five key recommendations:
- Review your current Meta campaigns and assess true creative diversity
- Consolidate campaigns and ad sets – aim for one per objective
- Increase creative variation dramaticallyl
- Test broader targeting and let the algorithm match content to users
- Be patient and allow the system to learn before making changes
The bigger picture: Creative strategy becomes crucial
Andromeda is not just an algorithm update – it’s a new era in digital advertising. Automation and AI now handle the manual adjustments, meaning the value of marketers lies in strategic creativity.
Brands performing best are those with strong creative teams capable of producing relevant, varied content at scale. Agencies will need to invest more in creative capabilities as demand for volume and quality increases.
Global brands that have adapted report an average of 17% more conversions and 16% lower costs. The difference lies in understanding that the entire advertising landscape has changed.