What is the difference between ABO and CBO?

ABO sets budgets per ad set (you control spending). CBO sets one campaign budget and Meta auto-distributes. ABO gives you more control for testing; CBO is better for scaling proven audiences.

When should I switch from ABO to CBO?

Switch to CBO once you have identified your winning audiences and creatives through ABO testing. CBO excels at scaling because it automatically allocates more budget to top performers.

Is ABO being deprecated?

No. While Meta has made CBO the default for new campaigns, ABO is still fully available. Many experienced advertisers prefer ABO for testing phases and switch to CBO only for scaling.

Advertising Glossary

ABO

Ad Set Budget Optimization (ABO)

What is ABO?

Ad Set Budget Optimization (ABO) is the budget strategy where you set individual budgets for each ad set within a campaign. Unlike CBO, you have full control over how much each audience or targeting variation spends. ABO is ideal for testing because each ad set gets its fair share of budget regardless of early performance.

Example

You create a testing campaign with 4 ad sets, each with a $25/day budget. Regardless of which ad set performs best early on, each gets exactly $25/day. After 5 days of data, you analyze results and scale the winner while pausing the losers.

Industry Benchmarks

Platform / Segment	Value	Note
Testing Phase	$20 – $50/day per ad set	Enough for meaningful data
Testing Duration	5 – 7 days	Before making decisions
Best For	A/B testing	Equal budget = fair comparison
Control Level	Full manual	You decide spend allocation

Testing Phase$20 – $50/day per ad set

Enough for meaningful data

Testing Duration5 – 7 days

Before making decisions

Best ForA/B testing

Equal budget = fair comparison

Control LevelFull manual

You decide spend allocation

Benchmarks are approximate averages and vary by industry, targeting, season, and geography.

Optimization Tips

1
Use ABO when testing new audiences, creatives, or placements to ensure each variation gets equal budget.
2
Set each ad set budget to at least 10x your expected CPA to generate enough conversion data.
3
Run ABO tests for a full 5–7 days before drawing conclusions, early results can be misleading.
4
Graduate winning ad sets from ABO testing into CBO scaling campaigns for automated optimization.