Meta auction vs reservation: what each buying type locks in, in Meta's words
Meta has two buying types. Reservation fixes the CPM and predicts reach before you book; auction prices every impression. Who can use each, and the limits.
- Hristijan Jankulovski
- Updated October 31, 2026
- 10 min read
Meta sells ads two ways. Auction prices each impression as it is bought, and Meta calls it the option with "more choice, efficiency and flexibility, with less predictable results". Reservation, called reach and frequency until October 2023, lets you book an awareness or engagement campaign up to six months ahead at a fixed CPM, with a prediction of reach and frequency before you pay. Meta says reservation is for audiences of more than 200,000 people and needs a lifetime budget. It gives no minimum spend. The fixed price holds "provided your campaign is not paused", and delivery "is not 100% guaranteed".
Choose the right buying type for your brand campaign
Meta's comparison page for brand campaigns defines the pair in two lines:
Reservation: Lets you plan and buy your campaigns in advance, with predictable performance goals and more control over your frequency controls.
Auction: Offers more choice, efficiency and flexibility, with less predictable results.
It then compares them for the awareness and engagement objectives, the only ones reservation runs on. The rows, in Meta's wording:
| Reservation | Auction | |
|---|---|---|
| Budget | Lifetime | Daily or lifetime |
| Bidding | Automatic | Highest volume |
| CPM | Fixed price | Dynamic price (based on auction) |
| Performance goals | Reach (default), ad recall lift, ThruPlay | Reach (default), impressions, ad recall lift, ThruPlay, 2-second continuous video view |
| Frequency controls | Target frequency (default), frequency cap | Frequency cap |
| Placements | Facebook, Instagram | Facebook, Instagram, Messenger and Audience Network |
| Formats | "All formats available, except 360 video and 360 photos" | "All formats available, dependent on the campaign objective" |
| Ad sequencing | Yes | Not available |
| Delivery | Standard, or sequenced or scheduled | "Standard delivery only" |
| Predictability | "Prediction given for reach, frequency distribution, spend per day, and placement distribution before purchasing" | "Daily reach prediction only" |
| Pricing | "The CPM you will pay for impressions won't change once you place your order, provided your campaign is not paused" | "Prices can change in the auction. You compete in the auction with your bid" |
| Scheduling | Part of the day; "You can't vary this selection by the day of the week" | Different times for different days of the week |
Brand safety (full, standard or limited inventory) and targeting are the same for both. Meta adds that reservation buys no better inventory: "reservation campaigns do not include premium or exclusive placements." One row of this table, frequency controls, disagrees with another Meta page (see below).
Who can use reservation?
Meta's pages set conditions on the campaign rather than the advertiser. About reservation says it is for advertisers who want to:
Reach an audience of more than 200,000 people.
Have predictable reach for their ads.
Control how many times people see their ads.
Plan and book campaigns in advance.
Set up a reservation campaign narrows the objectives: "an awareness objective with performance goals of reach, ad recall lift and ThruPlay", or "an engagement objective with the performance goal of maximizing ThruPlay views for video." Sales, leads, traffic and app promotion campaigns are auction only. The October 2023 change removed "link click, impressions and post engagement" as reservation goals.
Meta doesn't give a minimum budget or a minimum campaign length for reservation as a whole. Meta's frequency controls table gives target frequency in a reservation campaign a "Minimum 7 days" and a frequency cap "No minimum". If the audience is too small for the budget, Ads Manager shows an error that there aren't enough people, and Meta's advice is to adjust "your targeting, brand safety settings, placements, campaign dates, frequency controls or your performance goal."
For planning ahead of booking, Meta's Reach Planner is "a standalone tool for media planners to predict, compare and export media plans", and it sends a plan to Ads Manager "where you can secure your inventory and finalize and book your campaign." Meta notes: "You need access to a business portfolio in Meta Business Suite to use Reach Planner."
What does a reservation lock in?
The price, and a forecast. About reservation says the system "will make a prediction about how many people you will reach with your set budget and frequency settings", and you can "plan and reserve your brand campaigns up to six months in advance, while ensuring a fixed CPM." The forecast is a prediction, not a guarantee:
Reservation offers predictable delivery of reach, but delivery is not 100% guaranteed. We only charge you for the ads delivered, while offering flexibility for advertisers to cancel reservation campaigns after they start.
Several changes end the lock and send you back for a new quote:
| Change | What Meta says happens |
|---|---|
| Pause, or edit targeting, placement or ad format after publishing | "require a new prediction quote, which means your initial reach, frequency and fixed CPM will no longer apply" |
| Ad set turned off for more than 30 minutes | "will require a new reservation prediction" |
| Budget or end date changed | "may generate a new prediction for your campaign" |
| Campaign deleted or canceled | "you will need to re-book the campaign, and may receive a new CPM and prediction" |
Editing the ad creative is the exception: Meta says "your prediction won't change".
Reservation does not leave the auction. The setup page says your "bid strategy and delivery type are fixed because Meta will automatically bid in the auction on your behalf and pace your delivery to align with your budget and campaign goals." What you buy is Meta bidding for you in the ad auction at a price set in advance.
Frequency under each buying type
Reservation defaults to target frequency, an average number of impressions per person per week, and also offers a frequency cap. Meta's Glossary of reservation terms says the cap "defaults to 2 impressions every 7 days" when you use one. Auction campaigns get a cap, and target frequency with a Reach or ThruPlay goal, a lifetime budget, no bid control and 7 to 90 days. Meta's two frequency controls has the full conditions and Meta's delivery examples for both.
How creative works in a reservation campaign
Creative is the one thing you can change mid-flight without touching the price. Meta's underdelivery page says you "can still upload and edit ad creative during an active campaign without changing the campaign's predicted reach and frequency."
Creative also feeds the forecast before you book:
Each prediction in reservation campaigns depends on the past creative quality from the Facebook Page associated with the ad account you're running campaigns from. Creative quality is determined by a mix of signals including positive feedback and negative feedback your ads received in the past 90 days.
When fewer people want to see an ad than predicted, "the ad will become too expensive to deliver in full." Meta's fix is more than one ad: "use 2 or more ads or variations on an ad in each reservation ad set whenever possible. If one ad is under-performing, the system will try to automatically deliver the higher-performing version." It also says ads not approved by the start date won't deliver, and a reservation with no ads uploaded "cannot start delivering as planned."
Sequencing, where people see ads in an order you set, ties the number of ads to frequency. From Meta's page on sequencing or scheduling ads with the reservation buying type: "a 2-week campaign set to a target frequency 2 times per week allows for 4 ads." To sequence more, "lengthen your campaign or increase ad frequency." In auction, Meta's table describes the opposite approach: "Meta will try to automatically identify the highest performing ad and serve that ad the most among a set."
Where Meta's reservation pages disagree
About reservation is the page with a dated changelog, and three older pages haven't caught up with it or with each other.
Reserve before you create an ad? Set up a reservation campaign still says: "Note: You must reserve your ad set before you can create an ad or publish your reservation campaign." About reservation, under changes "starting October 2024", says: "You no longer need to reserve and publish your reservation ad sets before creating an ad."
Pausing and editing a live campaign. Meta's edit, pause or delete page says: "You cannot pause your reservation campaign after it starts", and "Once the campaign has started, you can only edit your ad creative, your budget or extend the end date." About reservation's October 2024 changes say: "You can pause and unpause reservation ad sets. Additionally, you can make edits to your targeting, placement and ad format selection once your ad sets are published." About reservation adds that these actions "will require a new prediction quote". The edit page says only that a cancelled campaign has to be re-booked and "may receive a new CPM and prediction on campaign outcomes".
Target frequency in auction. The buying-type table lists only "Frequency cap" for auction, while Meta's frequency controls for auction page offers target frequency too. The frequency controls post covers that one.
Placements, inside one page. The buying-type page's opening list says reservation ads "can be placed on Facebook and Instagram", and its table agrees. A few lines down, its awareness example says reservation ads "can appear on the Facebook Feed, in-stream videos, Instagram feed, Instagram Explore, Facebook Stories, and Audience Network." The same page's opening list puts auction on WhatsApp, which its table row leaves out.
If your Ads Manager lets you create ads before reserving, or pause and edit a live reservation, it matches the October 2024 changes listed on About reservation.
Which buying type to pick
- Check the objective. Anything outside awareness and engagement is auction.
- Check the audience size. Meta frames reservation for more than 200,000 people.
- Pick reservation when the plan has to be known up front: a fixed CPM, a reach forecast and a frequency distribution before you pay, booked up to six months out. Meta notes that people who run reservation "also launch auction campaigns for awareness and engagement objectives."
- Pick auction for daily budgets, Messenger placements, the impressions goal, or any objective past awareness and engagement.
- Load reservation ad sets with more than one ad and get them approved before the start date, since a creative edit is the one change that keeps your quote.
Sources
- Choose the right buying type for your brand campaign — Meta Business Help Center (accessed October 28, 2026)
- About reservation — Meta Business Help Center (accessed October 28, 2026)
- Set up a reservation campaign — Meta Business Help Center (accessed October 28, 2026)
- How to edit, pause or delete a reservation campaign, ad set or ad — Meta Business Help Center (accessed October 28, 2026)
- Troubleshoot reservation campaign underdelivery — Meta Business Help Center (accessed October 28, 2026)
- Sequencing or scheduling ads with the reservation buying type — Meta Business Help Center (accessed October 28, 2026)
- Glossary of reservation terms — Meta Business Help Center (accessed October 28, 2026)
- Choosing your frequency controls for a reservation campaign — Meta Business Help Center (accessed October 28, 2026)
- About frequency controls for auction — Meta Business Help Center (accessed October 28, 2026)
- Get started with Meta Reach Planner — Meta Business Help Center (accessed October 28, 2026)
Meta revises these pages without notice, and features roll out per account, so check the source before booking.
Terrads makes a second and third ad for a campaign from the same brand kit, so a reservation ad set has another ad to fall back on and a sequence has enough ads to fill it.