Asus Zenfone 12 Ultra Review: A Big-Screen Flagship That Quietly Nails the Essentials

Asus spent years as the brand that made smaller phones for people with big expectations. The Zenfone 12 Ultra closes that chapter for good: this is a large, 6.78-inch flagship built to sit at the top of the Android market. The surprise is how complete it feels. Rather than chasing one headline gimmick, Asus has spread its effort across the screen, the battery, the cameras and the software, and the result is a phone that is genuinely easy to live with.

Design and display

The Zenfone 12 Ultra is confident but understated. The flat-sided aluminium frame, frosted glass back and slim, even bezels give it a clean, premium look that does not shout for attention. It is a big phone, and there is no getting around that, but the weight is balanced well and the matte finish resists fingerprints far better than the glossy flagships it competes with. An IP68 rating means dust and water are not a worry.

The 6.78-inch LTPO AMOLED panel is the centrepiece. It runs at up to 144Hz, gets bright enough to stay readable in direct sunlight, and dials the refresh rate down when you are reading static content to save power. Colours are accurate out of the box, and the adaptive refresh makes everyday scrolling feel effortless.

Performance

Inside is Qualcomm's latest flagship Snapdragon silicon paired with up to 16GB of RAM, and it shows. Apps open instantly, heavy games hold their frame rates, and the phone stays composed under sustained load thanks to a sensible cooling system. For most buyers this is more performance than they will ever need, which is exactly the point of a phone like this: it should still feel fast in three years.

Cameras

Asus leans on its history of stabilisation here. The 50MP main sensor uses a six-axis hybrid gimbal system that keeps handheld video remarkably steady, which is the Zenfone's real party trick. You also get a 3x telephoto for tighter portraits and a wide-angle lens for landscapes. Daylight shots are detailed and natural, low-light results are clean if not class-leading, and the video stabilisation genuinely outperforms most rivals when you are walking and filming.

Battery and charging

A 5,500mAh battery comfortably clears a full day and often stretches into a second with lighter use. When you do top up, wired fast charging refills the phone quickly, and there is wireless charging for overnight convenience. Battery anxiety simply is not part of the experience here, which matters more day to day than any benchmark score.

Software and AI

Asus keeps its Android build clean and close to stock, then layers practical AI tools on top rather than burying you in them. Live call translation, automatic transcription of voice recordings and on-device semantic search are the standouts, and they work without feeling like marketing checkboxes. Asus has also committed to several years of OS and security updates, which makes the phone easier to recommend as a long-term purchase.

Price and value

The Zenfone 12 Ultra is priced as a flagship, but it undercuts the most expensive phones from Samsung and Apple while matching them on the fundamentals. You are paying for a top-tier chip, a superb screen, a big battery and standout video stabilisation. What you give up is the marketing gloss and the very last few percent of camera polish.

Who should buy it

Buy the Zenfone 12 Ultra if you want a big-screen Android flagship that focuses on the things you actually use every day: a great display, dependable battery life, clean software and the best handheld video stabilisation in its class. If you specifically want the absolute best night-time photography or a compact phone, look elsewhere. For everyone else, this is one of the most quietly competent flagships of the year.