Home Phone comparison Xiaomi Mi 9 and OnePlus 15 - Which is better?

Xiaomi Mi 9 vs OnePlus 15

50 out 100
Xiaomi Mi 9
VS
91 out 100
OnePlus 15
Xiaomi Mi 9
OnePlus 15

Compared 2 smartphones : Xiaomi Mi 9 Manufactured in April, 2019, with display 6.39 with chipsetQualcomm Snapdragon 855, vs OnePlus 15, Manufactured in October, 2025 with chipsetQualcomm Snapdragon 8 Elite Gen 5. Below are specs, tests, pros and cons for each device

  1. Differences
  2. Review
  3. Specs
  4. Benchmarks
  5. Battery Life
  6. Cameras
  7. Comments (0)

Key Differences

Device key advantages
Reasons to choose Xiaomi Mi 9
  • Lighter design: 173g vs 211g
Reasons to choose OnePlus 15
  • Larger display: 6.78in
  • Higher pixel density: 450ppi
  • Higher refresh rate: 165Hz
  • Higher battery capacity: 7300mAh vs 3300mAh
  • Newer Bluetooth version: 6.0 vs 5
  • Supports newer USB: 3.2 vs 2
  • Supports DisplayPort
  • Built-in eSIM
  • Includes charger

Versions

Available versions and configurations
Memory Options - 6/64 GB
- 6/128 GB
- 8/64 GB
- 8/128 GB
- 8/256 GB		 - 12/256 GB
- 12/512 GB
- 16/256 GB
- 16/512 GB
- 16/1024 GB

Review

Key Specs Xiaomi Mi 9 and OnePlus 15
Display
Color accuracy, sharpness & brightness
Camera
Main & front camera tests
Performance
App & system performance
Games
3D gaming performance
Battery
Battery life, charging speed & type
Connectivity
Connectivity features
NanoReview Score
Overall score by NanoReview
Adjust each parameter’s importance to find the best match for you.
Customize your score
Function
Importance (Weight)
Display:
Camera:
Performance:
Gaming:
Battery:
Connectivity:
Higher weight means greater impact on NanoReview score.

Tests & specs

Specs & test comparison
Smartphones:
Xiaomi Mi 9
vs
OnePlus 15

Display

Display quality comparison
Type AMOLED AMOLED
Size 6.39 in 6.78 in
Resolution 1080x2340 pixels 1272x2772 pixels
Aspect ratio 19.5:9 19.5:9
Pixel density 403 ppi 450 ppi
Refresh rate 60 Hz 165 Hz
Adaptive refresh rate No Yes (1-120 Hz)
Max brightness 600 nits 1800 nits
HDR support Yes HDR10 Yes, Dolby Vision
Screen-to-body ratio 85.3 % 91.2 %
Features - Always-On Display
- DC dimming		 - DCI-P3
- Always-On Display
- DC dimming
Display test
Peak brightness (auto)
Xiaomi Mi 9
619 nits
OnePlus 15
n/a
sRGB gamut95.4 %n/a
PWM (Flicker)245 Hzn/a
Response time4.2 msn/a
Contrast∞ Infiniten/a
Sources: NotebookCheck [Xiaomi Mi 9]

Design & Build

Design and ergonomics comparison
Height 157.5 mm (6.2 in) 161.4 mm (6.35 in)
Width 74.6 mm (2.94 in) 76.7 mm (3.02 in)
Thickness 7.6 mm (0.3 in) 8.1 mm (0.32 in)
Weight 173 g (6.1 oz) 211 g (7.44 oz)
Water resistance No IP69
Cooling system n/a Vapor chamber
Back panel Glass Glass
Frame Metal Metal
Colors - Black
- Blue
- Purple		 - Black
- Gold
- Purple
Fingerprint sensor Yes In-Display Yes, In-Display
Screen-to-body ratio
Xiaomi Mi 9
85.3 %
OnePlus 15
91.2 %

Performance

Testing Xiaomi Mi 9 and OnePlus 15 In benchmarks
Processor
Chipset Qualcomm Snapdragon 855 Qualcomm Snapdragon 8 Elite Gen 5
Max Frequency 2840 MHz 4600 MHz
CPU Cores 8 (1 + 3 + 4) 8 (2 + 6)
Architecture - 4/1.8 (Cortex-A55 (Kryo 485 Silver))
- 3/2.42 (Cortex-A76 (Kryo 485 Gold))
- 1/2.84 (Cortex-A76 (Kryo 485 Gold))		 6/3.63 ()
Process TSMC TSMC
Transistor Size 7 nm 3 nm
Neural Processor Hexagon 690 Hexagon
Graphics Adreno 640 Adreno 840
GPU Cores 768 1536
GPU Frequency 585 MHz 1200 MHz
FLOPS 898.5 GFLOPS 3686.4 GFLOPS
GeekBench v6
Geekbench 6 (Single-Core)
Xiaomi Mi 9
898
OnePlus 15
3726
Geekbench 6 (Multi-Core)
Xiaomi Mi 9
2206
OnePlus 15
11199
Geekbench 6 (Single-Core)8983726
Geekbench 6 (Multi-Core)220611199
Geekbench Compute (GPU)n/a27829
Sources: Geekbench v6 [OnePlus 15]
AnTuTu 10
AnTuTu 10
Xiaomi Mi 9
651041
OnePlus 15
3434737
CPU209300968935
GPU1917471235307
Memory113809489823
UX136185740672
NanoReview Score6510413434737
3DMark Wild Life
3DMark Wild Life
Xiaomi Mi 9
3100
OnePlus 15
n/a
Max Surface Temp.35.6 °Cn/a
Stability91 %n/a
Graphics Test18 fpsn/a
Graphics Score3100n/a
Sources: 3DMark [Xiaomi Mi 9]
PCMark 3.0
PCMark 3.0
Xiaomi Mi 9
10649
OnePlus 15
n/a
Writing score14618n/a
Web score7084n/a
Video editing6715n/a
Data manipulation7931n/a
NanoReview Score10649n/a

Memory

RAM
RAM Size 6 GB 12 GB
Memory Type LPDDR4X LPDDR5X
Memory Frequency 2133 MHz 5300 MHz
Channels 2 4
Storage
Storage Capacity128 GB256 GB
Storage TypeUFS 2.1UFS 4.1
Memory CardNoNo

Software

OS Android 9.0 (Upgradeable to Android 11) Android 16
OS Size 13.5 GB n/a
UI Skin MIUI 12.5 OxygenOS 16

Battery

Volume 3300 mAh 7300 mAh
Max Charging Power 27 W 120 W
Battery Type Li-Po Silicon Carbon (Si/C)
Removable No No
Wireless Charging Yes (20 W) Yes (50 W)
Reverse Charging No Yes, (Wireless)
Fast Charging Yes Quick Charge 4 (50% in 30 min) Yes (50% in 15 min)
Full Charge Time 1:30 h 0:43 h
Battery Life Test
Battery Life
Xiaomi Mi 9
17:14
OnePlus 15
n/a
Web Browsing06:08 hn/a
Video Playback11:37 hn/a
Games04:07 hn/a
Standby Mode83 hn/a

Main camera

Matrix 48 MP 50 MP
Photo resolution 8000x6000 pixels 8192x6144 pixels
Zoom Optical, 2x Optical, 3.5x
Flash Dual LED Dual LED
Stabilization Digital Optical
8K Recording No Yes (Up to 30 fps)
4K Recording Yes (Up to 60 fps) Yes (Up to 120 fps)
1080p Recording Yes (Up to 60 fps) Yes (Up to 60 fps)
Slow Motion 960 fps (1080p) n/a
Wide-angle lens 117 ° 116 °
Lenses count Standard: 48 MP
Telephoto: 12 MP
Ultra-wide: 16 MP		 Standard: 50 MP
Telephoto: 50 MP
Ultra-wide: 50 MP
Features - Bokeh effect
- Pro mode
- RAW support		 - Bokeh effect
- Pro mode
- RAW support
Main lens
Matrix48 MP50 MP
Aperturef/1.8f/1.8
Focal length27 mm24 mm
SensorSony IMX586Sony LYTIA-T808
Sensor size1/21/1.56
Pixel size0.8 μm1 μm
AutofocusLaser autofocusPhase autofocus
StabilizationDigitalOptical
Telephoto
Matrix12 MP50 MP
Aperturef/2.2f/2.8
Focal length54 mm85 mm
SensorSamsung S5K3M5Samsung S5KJN5
Sensor size1/3.61/2.76
Pixel size1 μm0.64 μm
StabilizationDigitalOptical
Ultra-wide lens
Matrix16 MP50 MP
Aperturef/2.2f/2.0
Focal length13 mm15 mm
SensorSony IMX481Samsung S5KJN5
Sensor size1/3.01/2.76
Pixel size1 μm0.64 μm
StabilizationDigitalDigital
Main camera DxOMark results
Photo quality
Xiaomi Mi 9
112
OnePlus 15
n/a
Video quality
Xiaomi Mi 9
99
OnePlus 15
n/a
Overall camera score
Xiaomi Mi 9
107
OnePlus 15
n/a
Sources: DxOMark [Xiaomi Mi 9]

Front camera

Matrix 20 MP 32 MP
Photo resolution 5184x3880 pixels 6560x4928 pixels
Aperture f/2.0 f/2.4
Focal length 18 mm 21 mm
Sensor CMOS Sony IMX615
Sensor size 1/3 1/2.74
Pixel size 0.9 μm 0.8 μm
Autofocus No Phase autofocus
Stabilization Digital Digital
Video resolution 1080p (Full HD) at 30 fps 2160p (4K) at 60 fps
TOF 3D sensor No No

Connectivity

Wi-Fi version Wi-Fi 5 (802.11 a/b/g/n/ac) Wi-Fi 7 (802.11 a/b/g/n/ac/ax/be)
Wi-Fi features - Dual Band
- Wi-Fi Direct
- Wi-Fi Hotspot
- Wi-Fi Display		 - Dual Band
- Wi-Fi MiMO
- Wi-Fi Direct
- Wi-Fi Hotspot
- Wi-Fi Display
Bluetooth version 5 6.0
Bluetooth features LE, A2DP LE
USB type USB Type-C USB Type-C
USB version 2 3.2
USB features - Charging
- USB Storage Mode
- USB-Host mode
- OTG		 - Charging
- USB Storage Mode
- OTG
DisplayPort n/a Yes
GPS - GPS
- GLONASS
- Beidou
- Galileo		 - GPS
- GLONASS
- Beidou
- Galileo
- QZSS
- NAVIC
NFC* Yes Yes
Infrared Port Yes Yes
Connectivity
SIM Count*22
SIM TypeNanoNano
SIM ModeDual SIM StandbyDual SIM Standby
eSIM Support *NoYes
Hybrid SlotNoNo
2G BandsGSM 850, GSM 900, GSM 1800, GSM 1900n/a
3G BandsHSDPA 850, HSDPA 900, HSDPA 1900, HSDPA 2100n/a
LTE Bands*LTE (B800/B900/B1800/B2100/B2300/B2500/B2600)n/a
LTE category20n/a
5G SupportNoYes

Sound

Speakers Mono n/a
3.5 mm Jack No No
FM Radio No No
Dolby Atmos No No
Speaker Test
Max Volume
Xiaomi Mi 9
87.1 dB
OnePlus 15
n/a

Other

Class Flagship Flagship
Announced February, 2019 yr October, 2025 yr
Release Date April, 2019 yr October, 2025 yr
Launch Price ($) 460 n/a
MSRP ($) n/a 899
Sensors - Hall Sensor
- Barometer
- Proximity Sensor
- Gyroscope
- Accelerometer
- Ambient Light Sensor
- Compass
- Fingerprint sensor		 - Proximity Sensor
- Gyroscope
- Accelerometer
- Ambient Light Sensor
- Compass
- Fingerprint sensor
Charger Included n/a Yes, 120 W
* Attention! Config, frequencies, NFC, and other specs may vary by region.

Results

After analyzing the data, we consider OnePlus 15 the clear winner in this comparison.

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