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Our Verdict
Analysis
Xiaomi 15 Ultra has the bigger display.
Overall Winner
Xiaomi 15 Ultra
Display Winner
Xiaomi 15 Ultra
Performance Winner
Tie
Camera Winner
Tie
Battery Winner
Tie
Value Winner
Tie
Specifications Comparison
| Feature | Infinix S3X | Xiaomi 15 Ultra |
|---|---|---|
| Display size (in) | 6.20 | 6.73 |
| Charging (W) | 10 | 90 |
| Main camera (MP) | 13.00 | 50.00 |
| Selfie (MP) | 16.00 | 32.00 |
| Weight (g) | 150 | 226 |
| Thickness (mm) | 8.00 | 9.35 |
| Chipset | Qualcomm MSM8937 Snapdragon 430 (28 nm) | Snapdragon 8 Elite |
| OS | Android 8.1 (Oreo) | Android 15, HyperOS 2 |
Pros & Cons
Infinix S3X
Xiaomi 15 Ultra
- Outstanding camera versatility
- Fast wired and wireless charging
- Bright display
- Heavy
- Software still polishing animations
- Limited availability in some regions
Every Spec, Side by Side
Specification
Infinix
Infinix S3X
Xiaomi
Xiaomi 15 Ultra
Battery 3 specs
Type
4000 mAh, non-removable
Market-dependent versions:· Si/C Li-Ion 5410 mAh - Global· Si/C Li-Ion 6000 mAh - China
Charging
10W wired
90W wired, 80W wireless
Capacity
—
5410 mAh
Body 5 specs
Dimensions
156.7 x 75.3 x 8 mm (6.17 x 2.96 x 0.31 in)
161.3 x 75.3 x 9.35 mm
Weight
150 g (5.29 oz)
226 g
SIM
Nano-SIM + Nano-SIM
· Nano-SIM + Nano-SIM· Nano-SIM + Nano-SIM + eSIM + eSIM (max 2 at a time)
Build
—
Glass front, glass-fiber reinforced plastic back or silicone polymer back (eco leather), aluminum frame
—
IP68 dust tight and water resistant (immersible up to 1.5m for 30 min)
Aerospace-grade glass fiber
Connectivity 8 specs
WLAN
Wi-Fi 802.11 b/g/n
Wi-Fi 802.11 a/b/g/n/ac/6e/7, dual-band or tri-band, Wi-Fi Direct
Bluetooth
4.2, A2DP, LE
6.0, A2DP, LE, aptX HD, aptX Adaptive, LHDC 5
Positioning
GPS
GPS (L1+L5), BDS (B1I+B1c+B2a), GALILEO (E1+E5a), QZSS (L1+L5), NavIC (L5), GLONASS
NFC
No
Yes
Radio
FM radio
No
USB
microUSB 2.0, OTG
USB Type-C 3.2 Gen 2, DisplayPort, OTG
Infrared port
—
Yes
5G
—
Yes
Display 4 specs
Type
IPS LCD
LTPO AMOLED
Size
6.2 inches, 96.7 cm2 (~82.0% screen-to-body ratio)
6.73 inches
Resolution
720 x 1500 pixels (~268 ppi density)
1440 x 3200 pixels
Protection
—
Xiaomi Shield Glass 2.0, Mohs level 6
Features 2 specs
Sensors
Fingerprint (rear-mounted), accelerometer, gyro, proximity, compass
Fingerprint (under display, ultrasonic), accelerometer, proximity, gyro, compass, barometer
—
Two-way satellite communication (China model only)
Launch 2 specs
Announced
2018. Released 2018
2025, February 27
Status
Discontinued
Available. Released 2025, February 27
Main Camera 4 specs
Dual
13 MP, PDAF
Auxiliary lens
—
Features
Dual-LED flash, panorama, HDR
Laser AF, color spectrum sensor, Leica lenses, Dual-LED flash, HDR, panorama, 67mm filter ring holder (optional)
Video
1080p@30fps
8K@30fps, 4K@30/60/120fps, 1080p@30/60/120/240/480/960/1920fps, gyro-EIS, Dolby Vision HDR 10-bit rec. (4K@60fps, 1080p)
Quad
—
50 MP + 50 MP + 200 MP + 50 MP
Memory 5 specs
Card slot
microSDXC (dedicated slot)
No
Internal
32GB 3GB RAM, 64GB 4GB RAM
256GB 12GB RAM, 512GB 16GB RAM, 1TB 16GB RAM
eMMC 5.1
UFS 4.1
RAM
—
16GB
Storage
—
512GB
Misc 4 specs
Colors
Ice Blue, Sandstone Black, Tradewinds Grey
Black, White, Silver Chrome, Green
Models
X622
25010PN30G
SAR EU
—
1.00 W/kg (head) 1.00 W/kg (body)
Price
—
$ 693.75 / £ 1,295.00 / € 812.34
Network 7 specs
Technology
GSM / HSPA / LTE
GSM / HSPA / LTE / 5G
2G bands
GSM 850 / 900 / 1800 / 1900
GSM 850 / 900 / 1800 / 1900
3G bands
HSDPA 850 / 900 / 2100
HSDPA 800 / 850 / 900 / 1700(AWS) / 1900 / 2100
4G bands
1, 3, 5, 8, 40, 41
1, 2, 3, 4, 5, 7, 8, 12, 13, 17, 18, 19, 20, 25, 26, 28, 32, 38, 39, 40, 41, 42, 48, 66, 71 - International
Speed
HSPA 42.2/5.76 Mbps, LTE Cat4 150/50 Mbps
HSPA, LTE, 5G
—
1, 2, 3, 5, 7, 8, 12, 20, 26, 28, 38, 40, 41, 48, 66, 77, 78, 79, 80, 81, 83, 84, 89 SA/NSA - China
5G bands
—
1, 2, 3, 5, 7, 8, 12, 20, 25, 26, 28, 38, 40, 41, 48, 66, 71, 75, 77, 78, 79 SA/NSA - International
Platform 4 specs
OS
Android 8.1 (Oreo)
Android 15, HyperOS 2
Chipset
Qualcomm MSM8937 Snapdragon 430 (28 nm)
Snapdragon 8 Elite
CPU
Octa-core 1.4 GHz Cortex-A53
Octa-core (2x4.32 GHz Oryon V2 Phoenix L + 6x3.53 GHz Oryon V2 Phoenix M)
GPU
Adreno 505
Adreno 830
Selfie Camera 3 specs
Single
16 MP, 1.4µm
32 MP
Features
—
HDR, panorama
Video
—
4K@30/60fps, 1080p@30/60fps, gyro-EIS
Sound 3 specs
Loudspeaker
Yes
Yes, with stereo speakers
3.5mm jack
Yes
No
—
24-bit/192kHz Hi-Res & Hi-Res Wireless audio
Qualcomm XPAN (24-bit/96kHz audio)
Eu Label 4 specs
Energy
—
Class A
Battery
—
58:58h endurance, 1000 cycles
Free fall
—
Class C (90 falls)
Repairability
—
Class C
Our Tests 2 specs
Loudspeaker
—
-24.1 LUFS (Very good)
Battery
—
Active use score 16:13h
Similar Comparisons
Common Questions
Which phone is the best in this comparison?
Xiaomi 15 Ultra has the bigger display.
How are the comparison winners decided?
We compare measurable specs (display size, battery capacity, RAM, charging, weight) and price (USD). When two phones tie or data is missing we mark the category "Depends".
Which is more affordable?
The cheaper option is shown as the value winner above. Prices are USD and may vary by region or retailer.