ASUS Zenfone 12 Ultra Review: A Flagship That Skips the Marketing Budget
ASUS built its phone reputation on the ROG Phone gaming line, but the Zenfone 12 Ultra is a different pitch entirely: a compact-feeling flagship with genuinely unusual camera hardware, priced at $1,142 and sold with almost none of the marketing push Samsung or Apple put behind their comparable phones. That obscurity means most buyers have never heard of it — but the spec sheet reads like a phone that should be getting far more attention than it does.
The camera system is the real story
The headline feature is ASUS's gimbal-stabilized main camera — a 50MP sensor built around Sony's Lytia 700 chip, mounted on a physical gimbal rather than relying purely on optical image stabilization. That hardware-level stabilization makes a measurable difference in handheld video and low-light stills, smoothing out the kind of hand shake that OIS alone can only partially correct. It's paired with a 13MP ultra-wide and a 32MP 3x telephoto, plus a 32MP RGBW front camera (output at 8MP) that uses a non-standard sensor arrangement to pull in more light per pixel than a typical selfie camera.
For anyone who shoots a lot of handheld video — vlogging, kids' sports games, travel clips — the gimbal stabilization alone is worth researching in more depth than a spec sheet comparison can convey. It's the single most differentiated piece of hardware on this phone relative to anything Samsung, Apple, or Google currently ships.
Display and performance
The 6.78-inch AMOLED panel runs a variable 1-120Hz refresh rate that jumps to 144Hz specifically for gaming, and peaks at 2,500 nits of brightness — bright enough to stay legible in direct sunlight, which matters more than most spec sheets suggest until you've actually tried to read a phone screen at a beach or outdoor event. Powering it is a full Snapdragon 8 Elite paired with the Adreno 830 GPU and up to 16GB of LPDDR5X RAM, putting it on genuinely equal footing with the Galaxy S25 Ultra and OnePlus 13 on raw performance, despite costing meaningfully less than the Samsung flagship.
Battery and everyday use
A 5,500mAh battery is on the larger side for a phone in this weight class, giving it solid multi-day-adjacent stamina for moderate users and comfortable all-day use even for heavier ones. At 220 grams and 8.9mm thick, it's noticeably heavier and thicker than an iPhone 17 or Pixel 10 — the trade-off ASUS made to fit the gimbal mechanism, larger battery, and bigger display into one chassis. If pocket comfort and one-handed use are priorities, that weight is worth handling in person before buying.
Why you've probably never heard of it
ASUS sells the Zenfone line through a much narrower set of retail and carrier partnerships than Samsung, Apple, or even Google, and its marketing budget in most markets is a fraction of what those companies spend. That's purely a business-strategy choice, not a reflection of the phone's actual quality — ASUS has historically used the profits from its much larger gaming-laptop and motherboard businesses to subsidize phones that compete on spec sheets rather than brand spend, the ROG Phone line being the more famous example of the same philosophy applied to gaming instead of photography.
How it compares to Xiaomi's camera flagship
The closest philosophical rival is the Xiaomi 15 Ultra, which takes a different approach to the same "camera is the priority" positioning — a Leica-tuned triple-50MP array with optical image stabilization rather than a gimbal, backed by a larger 6,100mAh battery and faster 90W wired charging. Xiaomi's phone leans on computational color science and lens partnership branding; ASUS leans on a genuinely novel piece of hardware engineering. Neither approach is objectively the better one on paper — the Xiaomi likely edges ahead in daylight color accuracy and in raw charging speed at 90W wired versus the ASUS's more modest charging rate, while the ASUS wins specifically for handheld video stability, an area where OIS-only systems, no matter how well tuned, are working against basic physics that a gimbal sidesteps. If your shooting is mostly stills, the Xiaomi 15 Ultra is worth cross-shopping directly against this phone before you decide.
Where it falls short
Software update commitments and long-term support are the biggest unknowns — always confirm ASUS's current promised OS and security update window before buying, since it can vary by region and hasn't matched Samsung's or Apple's multi-year guarantees historically. Retail presence is thin in many countries, which makes in-person hands-on time and warranty service less convenient than with a Galaxy or iPhone. And at 220g, it's a genuinely heavy phone that won't suit everyone's hand size or pocket preference.
A capable gaming phone by accident
ASUS didn't market the Zenfone 12 Ultra as a gaming phone the way it does the dedicated ROG Phone series, but the hardware underneath — a full Snapdragon 8 Elite, Adreno 830 GPU, and a 144Hz refresh rate mode specifically reserved for games — means it performs like one anyway. Sustained frame rates in demanding titles stay smooth thanks to the larger 5,500mAh battery giving thermal and power headroom that thinner, smaller-battery flagships don't have, even without ROG's dedicated cooling vents and shoulder triggers. If you game occasionally but don't want a phone that visually announces itself as a gaming device, this is a genuinely capable middle ground.
Verdict
If gimbal-stabilized handheld video is something you'd actually use — not just a spec you'd like to have — the Zenfone 12 Ultra is doing something no mainstream flagship currently offers, at a price below the Galaxy S25 Ultra. It's a phone built for buyers who read camera spec sheets closely, care about gaming performance without paying for a dedicated gaming phone's design language, and don't need brand recognition to justify a purchase. For a similarly specced but more mainstream alternative, our OnePlus 13 vs 13R breakdown covers Qualcomm's flagship chip in a more widely distributed phone, and if raw camera zoom range matters more to you than stabilization, see our existing best zoom camera phones roundup for how it compares to dedicated periscope setups.