REDMI K90 Ultra vs OnePlus Ace 6 Ultra
The REDMI K90 Ultra and the OnePlus Ace 6 Ultra share the same PhoneRanked score of 7.9. The REDMI K90 Ultra leads in camera, while the OnePlus Ace 6 Ultra is ahead in performance and battery. The REDMI K90 Ultra is the newer phone, announced Jun 30, 2026.
Key differences
Why choose the REDMI K90 Ultra
- Bigger screen 6.83 inches vs 6.78 inches
- Newer model Jun 30, 2026 vs Apr 28, 2026
- Thinner 8.18 mm vs 8.45 mm
- Higher-resolution video 8K@30 vs 4K@60
- Higher screen resolution 1280 × 2772 px vs 1272 × 2772 px
- Better selfie video 1080p@60 vs 1080p@30
Why choose the OnePlus Ace 6 Ultra
- Bigger battery 8,600 mAh vs 8,550 mAh
- Faster wired charging 120 W vs 100 W
- Brighter screen 3,600 nits vs 3,500 nits
- Better water resistance IP68 + IP69K vs IP68 + IP69
- More storage 256 GB / 512 GB / 1 TB vs 256 GB / 512 GB
- Lighter 217 g vs 227 g
PhoneRanked scores
Calculated from specs, relative to phones from the same year and price range. How we rate phones
Value for money marked “est.” is an estimate: that phone has no official US launch price, so it is not highlighted against the others.
Spec
REDMI K90 UltraOnePlus Ace 6 Ultra
Overall
7.9
7.9
Display
8.4
8.4
Performance
8.6
8.9
Camera
6.6
6.0
Battery
7.7
7.9
Design
8.8
8.8
Software support
3.5
3.5
Value for money
5.0 est.
5.0 est.
Display
Spec
REDMI K90 UltraOnePlus Ace 6 Ultra
Size
6.83 inches
6.78 inches
Type
OLED
OLED
Resolution
1280 × 2772 px
1272 × 2772 px
Pixel density
447 ppi
450 ppi
Refresh rate
165 Hz
165 Hz
Adaptive refresh
✕ No
✕ No
Peak brightness
3,500 nits
3,600 nits
HDR
HDR10+, Dolby Vision, HDR Vivid
—
Protection
—
Crystal Shield Glass
Performance
Spec
REDMI K90 UltraOnePlus Ace 6 Ultra
Process
3 nm
3 nm
Max CPU clock
4.32 GHz
4.21 GHz
GPU
Adreno 830
Arm Mali-G1-Ultra MC12
RAM
12 GB / 16 GB
12 GB / 16 GB
Storage
256 GB / 512 GB
256 GB / 512 GB / 1 TB
Storage type
UFS 4.1
UFS 4.1
microSD slot
✕ No
✕ No
Cameras
Spec
REDMI K90 UltraOnePlus Ace 6 Ultra
Main camera
50 MP, f/1.68, 1/1.55"
50 MP, f/1.8
Optical stabilization
✓ Yes
✓ Yes
Ultrawide
8 MP
8 MP
Rear cameras
2
2
Rear video
8K@30
4K@60
Front camera
20 MP
16 MP
Front video
1080p@60
1080p@30
Battery and charging
Spec
REDMI K90 UltraOnePlus Ace 6 Ultra
Capacity
8,550 mAh
8,600 mAh
Battery type
Silicon-carbon
—
Wired charging
100 W
120 W
Reverse wireless
✕ No
✕ No
Charger in box
✓ Yes
✓ Yes
Design and build
Spec
REDMI K90 UltraOnePlus Ace 6 Ultra
Dimensions
162.91 × 77.93 × 8.18 mm
162.45 × 77.47 × 8.45 mm
Thickness
8.18 mm
8.45 mm
Weight
227 g
217 g
Form factor
Bar
Bar
Frame
Aluminum
Aluminum
Back
—
Glass
Water resistance
IP68 + IP69
IP68 + IP69K
Fingerprint
Under-display ultrasonic
Under-display ultrasonic
3D face unlock
✕ No
✕ No
SIM
Dual Nano-SIM
Dual Nano-SIM
Colors
Space Silver, Sky Blue, Shadow Black
Ace Awakening, Metal Storm
Connectivity and features
Spec
REDMI K90 UltraOnePlus Ace 6 Ultra
5G
✓ Yes
✓ Yes
Wi-Fi
Wi-Fi 7
Wi-Fi 7
Bluetooth
5.4
6.0
USB
—
USB-C 2.0
NFC
✓ Yes
✓ Yes
3.5 mm jack
✕ No
✕ No
Stereo speakers
✓ Yes
✓ Yes
Satellite
✕ No
✕ No
IR blaster
✓ Yes
✓ Yes
Software
Spec
REDMI K90 UltraOnePlus Ace 6 Ultra
OS at launch
Android 16
Android 16
Interface
Xiaomi HyperOS 3
ColorOS 16
Launch and price
Spec
REDMI K90 UltraOnePlus Ace 6 Ultra
Announced
Jun 30, 2026
Apr 28, 2026
Released
Jun 30, 2026
—
Status
Released
Released
Green marks the stronger value in a row. Specs come from official manufacturer data, cross-checked with established tech media; each phone page lists its sources. Report an error
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