Oppo A6s 4G vs Redmi K90 Ultra
The Oppo A6s 4G (2026) runs on the Qualcomm Snapdragon 685, while the Redmi K90 Ultra (2026) runs on the Qualcomm Snapdragon 8 Elite. By overall MobileRank rating, the Redmi K90 Ultra leads — 73/100 vs 42/100 (a 31-point difference). Key differences: the Redmi K90 Ultra has the bigger battery (8550 mAh vs 7000); the Redmi K90 Ultra is faster in AnTuTu (3,233,695 vs 476,175).
Profile comparison
Category scores
Oppo A6s 4G
Redmi K90 Ultra
What makes Oppo A6s 4G better?
- Lighter: 215g vs 227g
- Better portability (44/100 vs 40/100)
What makes Redmi K90 Ultra better?
- Higher AnTuTu: 3233695 vs 476175
- Better Geekbench Single: 3013 vs 466
- Better Geekbench Multi: 9287 vs 1396
- Bigger battery: 8550 vs 7000 mAh
- Faster charging: 100W vs 80W
- Higher refresh rate: 165Hz vs 120Hz
- Higher performance (92/100 vs 34/100)
- Better camera (37/100 vs 32/100)
- Longer battery life (78/100 vs 68/100)
- Better display (94/100 vs 55/100)
Comparison verdict
Comparing the Oppo A6s 4G vs the Redmi K90 Ultra, the Redmi K90 Ultra scores 31 points higher (73/100 vs 42/100). In the "performance" category, the Redmi K90 Ultra leads (92/100 vs 34/100). In the "battery" category, the Redmi K90 Ultra leads (78/100 vs 68/100). In the "performance" category, the Redmi K90 Ultra significantly outperforms the Oppo A6s 4G (92/100 vs 34/100). In the "display" category, the Redmi K90 Ultra significantly outperforms the Oppo A6s 4G (94/100 vs 55/100). In the "camera" category, the Redmi K90 Ultra is a bit better (37/100 vs 32/100). In the "battery" category, the Redmi K90 Ultra is a bit better (78/100 vs 68/100). In the "portability" category, the Oppo A6s 4G and the Redmi K90 Ultra are nearly equal (44/100 vs 40/100).
Specs comparison
| Specification | Oppo A6s 4G | Redmi K90 Ultra | |
|---|---|---|---|
| Processor | Qualcomm Snapdragon 685 | Qualcomm Snapdragon 8 Elite | |
| AnTuTu | 476175 | 3233695 | |
| Geekbench Single | 466 | 3013 | |
| Geekbench Multi | 1396 | 9287 | |
| Display | 6.8" IPS LCD | 6.8" AMOLED | |
| Resolution | 720x1570 | 1280x2772 | |
| Refresh rate | 120 Hz | 165 Hz | |
| Battery | 7000 mAh | 8550 mAh | |
| Charging | 80W | 100W | |
| Main camera | 50 MP | 50 MP | |
| Ultrawide | 0 MP | 8 MP | |
| Front camera | 16 MP | 20 MP | |
| RAM | 8GB | 12GB / 16GB | |
| Storage | 128GB / 256GB | 256GB / 512GB | |
| OS | Android 15, ColorOS 15 | Android 16 | |
| Brightness (peak) | 1125 nits | 3500 nits | |
| NFC | yes | yes | |
| Protection | IP68 | IP68/IP69 | |
| Dimensions | 166.6×78.5×8.6 mm | 162.9×77.9×8.2 mm | |
| Weight | 215 g | 227 g | |
| Launch price | — | $420 |
Camera comparison
Oppo A6s 4G
- Main: 50MP f/1.8
- Front: 16MP
Redmi K90 Ultra
- Main: 50MP f/1.7
- Ultrawide: 8MP
- Front: 20MP
Display comparison
Oppo A6s 4G
- 6.8" IPS LCD
- Resolution: 720x1570
- Refresh rate: 120 Hz
Redmi K90 Ultra
- 6.8" AMOLED
- Resolution: 1280x2772
- Refresh rate: 165 Hz
Battery and charging
Oppo A6s 4G
- 7000 mAh
- Wired: 80W
- No wireless charging
Redmi K90 Ultra
- 8550 mAh
- Wired: 100W
- No wireless charging
Overall performance score
We compared Oppo A6s 4G and Redmi K90 Ultra, covering their specs and all relevant benchmarks.
Redmi K90 Ultra leads Oppo A6s 4G by 85.3% in our overall performance rating.
Benchmarks
Launch prices and where to check today's
Oppo A6s 4G
Price unknownDetailed category analysis
performance
In the "performance" category, the Redmi K90 Ultra significantly outperforms the Oppo A6s 4G (92/100 vs 34/100).
display
In the "display" category, the Redmi K90 Ultra significantly outperforms the Oppo A6s 4G (94/100 vs 55/100).
camera
In the "camera" category, the Redmi K90 Ultra is a bit better (37/100 vs 32/100).
battery
In the "battery" category, the Redmi K90 Ultra is a bit better (78/100 vs 68/100).
portability
In the "portability" category, the Oppo A6s 4G and the Redmi K90 Ultra are nearly equal (44/100 vs 40/100).
Frequently asked questions
Which is better: the Oppo A6s 4G or the Redmi K90 Ultra?
The Redmi K90 Ultra significantly outperforms the Oppo A6s 4G by 31 points (73/100 vs 42/100).
What is the rating of the Oppo A6s 4G and the Redmi K90 Ultra?
The Oppo A6s 4G has a MobileRank rating of 42/100, the Redmi K90 Ultra — 73/100.
Which has the better camera: the Oppo A6s 4G or the Redmi K90 Ultra?
The Redmi K90 Ultra leads on camera score (37/100 vs 32/100).
Which is more powerful: the Oppo A6s 4G or the Redmi K90 Ultra?
The Redmi K90 Ultra leads on performance (92/100 vs 34/100).
Should you choose the Oppo A6s 4G over the Redmi K90 Ultra?
The Redmi K90 Ultra is a better fit for gamers and power users, those who care about battery life.