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Samsung Galaxy S25 Ultra vs Xiaomi 15

The Xiaomi 15 comes out ahead on 6 counts and the Samsung Galaxy S25 Ultra on 4.

Which should you buy?

Pick the Samsung Galaxy S25 Ultra for

  • Bigger screen: 6.9" vs 6.36"
  • Higher-resolution main camera: 200 MP vs 50 MP
  • Optical zoom (5×), which the other lacks
  • Newer: launched February 2025

Pick the Xiaomi 15 for

  • Bigger battery: 5,240 vs 5,000 mAh (5% more)
  • Faster wired charging: 90 W vs 45 W
  • Faster wireless charging: 50 W vs 15 W
  • Lighter: 191 g vs 218 g (27 g less)
  • More compact: 10.5 mm shorter
  • Brighter display: 3,200 vs 2,600 nits peak

Size comparison

The Samsung Galaxy S25 Ultra is 10.5 mm taller, 6.4 mm wider and 27 g heavier than the Xiaomi 15. Its screen is 0.54" larger.

  • Samsung Galaxy S25 Ultra162.8 × 77.6 × 8.2 mm
  • Xiaomi 15152.3 × 71.2 × 8.08 mm

Specs side by side

LaunchSamsung Galaxy S25 UltraXiaomi 15
AnnouncedJanuary 22, 20251October 29, 20241
ReleasedFebruary 7, 20251October 29, 20241
Launch price$1,3001—
BodySamsung Galaxy S25 UltraXiaomi 15
Size162.8 × 77.6 × 8.2 mm152.3 × 71.2 × 8.1 mm
Thickness8.2 mm8.1 mm
Weight218 g191 g? (better)
FrameTitaniumaviation-grade aluminum1
Water resistanceIP68IP68
ColoursTitanium Silverblue, Titanium Black, Titanium Whitesilver, Titanium Gray, Titanium Jadegreen, Titanium Jetblack, Titanium Pinkgold1Liquid Silver, White, Black, Green
DisplaySamsung Galaxy S25 UltraXiaomi 15
Size6.9"6.36"
TypeDynamic LTPO AMOLED 2XCrystalRes AMOLED
Resolution1440 × 3120 (better)1200 × 2670
Refresh rate120 Hz120 Hz
Peak brightness2,600 nits3,200 nits (better)
ProtectionCorning Gorilla Armor 2—
Performance and softwareSamsung Galaxy S25 UltraXiaomi 15
ChipsetSnapdragon 8 Elite Mobile Platform for GalaxySnapdragon 8 Elite Mobile Platform
CPU2x 4.47 GHz Oryon (Phoenix L) and 6x 3.53 GHz Oryon (Phoenix M)12 x Prime Core up to 4.32GHz, 6 x Performance Core up to 3.53GHz
Process3 nm13 nm
Ships withOne UI 7Xiaomi HyperOS 2
OS updates7 years (to Feb 2032)—
Security updates7 years (to Feb 2032)—
MemorySamsung Galaxy S25 UltraXiaomi 15
RAM12 GB / 16 GB8 GB / 12 GB / 16 GB
Storage256 GB / 512 GB / 1 TB256 GB / 512 GB / 1 TB
Card slotNo1—
CamerasSamsung Galaxy S25 UltraXiaomi 15
Rear200 MP Main 50 MP Ultrawide 50 MP Telephoto (5× optical) 10 MP Telephoto (3× optical)50 MP Main 50 MP Telephoto 50 MP Ultrawide
Main camera200 MP (better)50 MP
Optical zoom5× (better)None
Front12 MP32 MP
Video8K at 30 fps8K (7680x4320) at 24/30fps
BatterySamsung Galaxy S25 UltraXiaomi 15
Capacity5,000 mAh5,240 mAh (better)
Wired charging45 W90 W (better)
Wireless charging15 W150 W (better)
Reverse wirelessYes—
ConnectivitySamsung Galaxy S25 UltraXiaomi 15
5GYesYes1
Wi-FiWi-Fi 7 (802.11 a/b/g/n/ac/ax/be tri-band)Wi-Fi 7
Bluetooth5.416.0
NFCYes1Yes
USBUSB Type-C 3.2 (5Gbps)USB Type-C
Headphone jackNo1—
eSIMYes1Yes
FeaturesSamsung Galaxy S25 UltraXiaomi 15
FingerprintUltrasonic under-displayUltrasonic in-screen
Stereo speakersYes1Yes
StylusYes—

Highlighted: the better value where one is clearly better. Sources for each phone are listed on the Samsung Galaxy S25 Ultra and Xiaomi 15 pages.

Quick answers

Is the Samsung Galaxy S25 Ultra bigger than the Xiaomi 15?
The Samsung Galaxy S25 Ultra is 10.5 mm taller, 6.4 mm wider and 27 g heavier than the Xiaomi 15. Its screen is 0.54" larger.
Which has the bigger battery, the Samsung Galaxy S25 Ultra or the Xiaomi 15?
The Xiaomi 15 has the bigger battery: 5,240 mAh against 5,000 mAh. Real battery life also depends on the chip and screen.

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