Samsung Galaxy S25 Ultra vs Xiaomi 15 Ultra
A spec-by-spec comparison of the Samsung Galaxy S25 Ultra and the Xiaomi 15 Ultra, taken from their full specification sheets. Green marks the better value in each measured row.
VS
Head to head
| Samsung Galaxy S25 Ultra | Xiaomi 15 Ultra | |
|---|---|---|
| Our rating | 9/10 | 9/10 |
| Battery | 5,000 mAh | 5,410 mAh |
| Wired charging | 45W | 90W |
| RAM (max) | — | 16 GB |
| Storage (max) | 512 GB | 512 GB |
| Screen size | 6.9 in | 6.73 in |
| Refresh rate | 120 Hz | 120 Hz |
| Main camera | 200 MP | 200 MP |
| Weight (lower is lighter) | 218 g | 226 g |
| Released | Feb 2025 | Feb 2025 |
Summary: Samsung Galaxy S25 Ultra is ahead on screen size, weight (lower is lighter). Xiaomi 15 Ultra is ahead on battery, wired charging.
Display
| Samsung Galaxy S25 Ultra | Xiaomi 15 Ultra | |
|---|---|---|
| Type | Dynamic AMOLED 2X, 120Hz, HDR10+, 2600 nits (peak) | LTPO AMOLED, 1B colors, 120Hz, Dolby Vision, HDR10+, 3528.5 nits (peak) |
| Size | 6.9 inches | 6.73 inches |
| Resolution | 1440 x 3120 pixels | 1440 x 3200 pixels |
| Protection | Corning Gorilla Glass Armor (rumored) | Xiaomi Shield Glass 2.0 |
Platform
| Samsung Galaxy S25 Ultra | Xiaomi 15 Ultra | |
|---|---|---|
| OS | Android 15, One UI 7.0 | Android 15, HyperOS 2 |
| Chipset | Qualcomm Snapdragon 8 Gen 4 for Galaxy (global) / Exynos 2500 (select regions) | Qualcomm Snapdragon 8 Elite (4 nm) |
| CPU | Octa-core (configuration varies by chipset) | Octa-core (2x Prime Core 4.32 GHz, 6x Performance Core 3.53 GHz) |
| GPU | Adreno (for Snapdragon) / Xclipse (for Exynos) | Adreno™ GPU |
Memory
| Samsung Galaxy S25 Ultra | Xiaomi 15 Ultra | |
|---|---|---|
| RAM | 12GB, 16GB | — |
| Storage | 256GB, 512GB, 1TB | — |
| Card slot | No | — |
| Internal | — | 256GB 12GB RAM, 512GB 16GB RAM, 1TB 16GB RAM |
| Card Slot | — | No |
Main Camera
| Samsung Galaxy S25 Ultra | Xiaomi 15 Ultra | |
|---|---|---|
| Quad | 200 MP, f/1.7, 23mm (wide), multi-directional PDAF, Laser AF, OIS; 50 MP, f/3.4, 115mm (periscope telephoto), 5x optical zoom, PDAF, OIS; 10 MP, f/2.4, 69mm (telephoto), 3x optical zoom, PDAF, OIS; 50 MP, f/1.9, 13mm, 120˚ (ultrawide), Dual Pixel PDAF | 50 MP, f/1.6, 23mm (wide), 1.0"-type, multi-directional PDAF, Laser AF, OIS; 50 MP, f/2.2, 12mm, 122˚ (ultrawide), AF; 50 MP, f/1.8, 75mm (telephoto), PDAF, OIS, 3.2x optical zoom; 200 MP, f/2.6, 120mm (periscope telephoto), 1/1.4"-type, PDAF, OIS, 5x optical zoom |
| Features | LED flash, auto-HDR, panorama | Leica lenses, Dual-LED flash, HDR, panorama, variable aperture |
| Video | 8K@24/30fps, 4K@30/60/120fps, 1080p@30/60/240fps, 1080p@960fps, HDR10+, stereo sound rec., gyro-EIS | 8K@24/30fps, 4K@24/30/60/120fps, 1080p@30/60/120/240/480/960/1920fps, gyro-EIS, OIS, HDR10+, 10-bit video |
Selfie Camera
| Samsung Galaxy S25 Ultra | Xiaomi 15 Ultra | |
|---|---|---|
| Single | 12 MP, f/2.2, 26mm (wide), Dual Pixel PDAF | 32 MP, f/2.0, 22mm (wide) |
| Features | Dual video call, Auto-HDR, HDR10+ | HDR, panorama |
| Video | 4K@30/60fps, 1080p@30fps | 4K@30/60fps, 1080p@30/60fps, gyro-EIS |
Battery
| Samsung Galaxy S25 Ultra | Xiaomi 15 Ultra | |
|---|---|---|
| Type | Li-Ion 5000 mAh, non-removable | Li-Po 5410 mAh, non-removable |
| Charging | 45W wired, PD3.0, 15W wireless (Qi/PMA), 4.5W reverse wireless | 90W wired, PD3.0, QC4, 100% in 35 min (approx.); 80W wireless, 100% in 49 min (approx.); 10W reverse wireless |
Body
| Samsung Galaxy S25 Ultra | Xiaomi 15 Ultra | |
|---|---|---|
| Dimensions | Approximately 162.3 x 79 x 8.2 mm (slightly smaller than S24 Ultra) | 161.3 x 75.3 x 9.4 mm |
| Weight | 218g - 219g | 226g (Glass fiber/Vegan leather), 229g (Silver Chrome) |
| Build | Glass front (Gorilla Glass Armor), glass back, titanium frame | Glass front (Xiaomi Shield Glass 2.0), aluminum frame, glass fiber or vegan leather back |
| SIM | Dual SIM (2 Nano-SIMs and eSIM, dual stand-by) | Dual SIM (Nano-SIM, dual stand-by) or eSIM |
| Stylus | S Pen support | — |
| IP Rating | — | IP68 dust/water resistant (up to 1.5m for 30 min) |
Comms
| Samsung Galaxy S25 Ultra | Xiaomi 15 Ultra | |
|---|---|---|
| WLAN | Wi-Fi 802.11 a/b/g/n/ac/6e/7, tri-band, Wi-Fi Direct | Wi-Fi 802.11 a/b/g/n/ac/6e/7, tri-band, Wi-Fi Direct |
| Bluetooth | 5.4, A2DP, LE | 5.4, A2DP, LE, aptX HD, aptX Adaptive |
| Positioning | GPS, GLONASS, BDS, GALILEO | GPS (L1+L5), GLONASS (G1), BDS (B1I+B1c+B2a), GALILEO (E1+E5a), QZSS (L1+L5), NavIC (L5) |
| NFC | Yes | Yes |
| Radio | No | — |
| USB | USB Type-C 3.2, OTG | USB Type-C 3.2, OTG |
| Infrared port | — | Yes |
Launch
| Samsung Galaxy S25 Ultra | Xiaomi 15 Ultra | |
|---|---|---|
| Announced | January 2025 | 2025, February 27 |
| Status | Available | Available |
Frequently asked questions
Which has the better battery, Samsung Galaxy S25 Ultra or Xiaomi 15 Ultra?
Xiaomi 15 Ultra — 5,000 mAh for the Samsung Galaxy S25 Ultra versus 5,410 mAh for the Xiaomi 15 Ultra.
Which is lighter, Samsung Galaxy S25 Ultra or Xiaomi 15 Ultra?
Samsung Galaxy S25 Ultra — 218 g for the Samsung Galaxy S25 Ultra versus 226 g for the Xiaomi 15 Ultra.
Which is newer, Samsung Galaxy S25 Ultra or Xiaomi 15 Ultra?
Xiaomi 15 Ultra — Feb 2025 for the Samsung Galaxy S25 Ultra versus Feb 2025 for the Xiaomi 15 Ultra.
Is the Samsung Galaxy S25 Ultra or the Xiaomi 15 Ultra rated higher?
We rate the Samsung Galaxy S25 Ultra 9/10 and the Xiaomi 15 Ultra 9/10.