OnePlus Ace 6 Ultra vs Redmi K40
The OnePlus Ace 6 Ultra (2026) runs on the MediaTek Dimensity 9500, while the Redmi K40 (2021) runs on the Qualcomm Snapdragon 870; launch prices were $555 and $309. By overall MobileRank rating, the OnePlus Ace 6 Ultra leads — 74/100 vs 54/100 (a 20-point difference). Key differences: the OnePlus Ace 6 Ultra has the bigger battery (8600 mAh vs 4520); the main camera is 50 MP vs 48 MP; the OnePlus Ace 6 Ultra is faster in AnTuTu (3,429,868 vs 1,010,069); the Redmi K40 is noticeably lighter (196g vs 217g).
Profile comparison
Category scores
OnePlus Ace 6 Ultra
Redmi K40
What makes OnePlus Ace 6 Ultra better?
- Higher AnTuTu: 3429868 vs 1010069
- Better Geekbench Single: 3293 vs 1298
- Better Geekbench Multi: 10243 vs 3520
- Bigger battery: 8600 vs 4520 mAh
- Faster charging: 120W vs 33W
- Better main camera: 50MP vs 48MP
- Higher refresh rate: 165Hz vs 120Hz
- Higher performance (94/100 vs 61/100)
- Longer battery life (82/100 vs 42/100)
- Better display (94/100 vs 79/100)
What makes Redmi K40 better?
- Lighter: 196g vs 217g
- Cheaper at launch: $309 vs $555
- Better camera (36/100 vs 35/100)
- Better portability (64/100 vs 43/100)
Comparison verdict
Comparing the OnePlus Ace 6 Ultra vs the Redmi K40, the OnePlus Ace 6 Ultra scores 20 points higher (74/100 vs 54/100). In the "performance" category, the OnePlus Ace 6 Ultra leads (94/100 vs 61/100). In the "battery" category, the OnePlus Ace 6 Ultra leads (82/100 vs 42/100). Value score: OnePlus Ace 6 Ultra — 66/100, Redmi K40 — 46/100; it shows how far a model sits above or below the usual level for its price, and is not part of the overall rating. In the "performance" category, the OnePlus Ace 6 Ultra significantly outperforms the Redmi K40 (94/100 vs 61/100). In the "display" category, the OnePlus Ace 6 Ultra notably outperforms the Redmi K40 (94/100 vs 79/100). In the "camera" category, the Redmi K40 and the OnePlus Ace 6 Ultra are nearly equal (36/100 vs 35/100). In the "battery" category, the OnePlus Ace 6 Ultra significantly outperforms the Redmi K40 (82/100 vs 42/100). In the "portability" category, the Redmi K40 notably outperforms the OnePlus Ace 6 Ultra (64/100 vs 43/100).
Specs comparison
| Specification | OnePlus Ace 6 Ultra | Redmi K40 | |
|---|---|---|---|
| Processor | MediaTek Dimensity 9500 | Qualcomm Snapdragon 870 | |
| AnTuTu | 3429868 | 1010069 | |
| Geekbench Single | 3293 | 1298 | |
| Geekbench Multi | 10243 | 3520 | |
| Display | 6.8" AMOLED | 6.7" AMOLED | |
| Resolution | 1272x2772 | 2400x1080 | |
| Refresh rate | 165 Hz | 120 Hz | |
| Battery | 8600 mAh | 4520 mAh | |
| Charging | 120W | 33W | |
| Main camera | 50 MP | 48 MP | |
| Ultrawide | 8 MP | 8 MP | |
| Front camera | 16 MP | 20 MP | |
| RAM | 12GB / 16GB | 6GB / 8GB / 12GB | |
| Storage | 256GB / 512GB / 1TB | 128GB / 256GB | |
| OS | Android 16 | Android 11 | |
| Brightness (peak) | 1800 nits | 1300 nits | |
| NFC | yes | yes | |
| Protection | IP66 | — | |
| Dimensions | 162.5×77.5×8.5 mm | 163.7×76.4×7.8 mm | |
| Weight | 217 g | 196 g | |
| Launch price | $555 | $309 |
Camera comparison
OnePlus Ace 6 Ultra
- Main: 50MP f/1.8
- Ultrawide: 8MP
- Front: 16MP
Redmi K40
- Main: 48MP f/1.79
- Ultrawide: 8MP
- Front: 20MP
Display comparison
OnePlus Ace 6 Ultra
- 6.8" AMOLED
- Resolution: 1272x2772
- Refresh rate: 165 Hz
Redmi K40
- 6.7" AMOLED
- Resolution: 2400x1080
- Refresh rate: 120 Hz
Battery and charging
OnePlus Ace 6 Ultra
- 8600 mAh
- Wired: 120W
- No wireless charging
Redmi K40
- 4520 mAh
- Wired: 33W
- Wireless charging: no data
Overall performance score
We compared OnePlus Ace 6 Ultra and Redmi K40, covering their specs and all relevant benchmarks.
OnePlus Ace 6 Ultra leads Redmi K40 by 239.6% in our overall performance rating.
Benchmarks
Launch prices and where to check today's
Launch price difference: $246. Redmi K40 was $246 cheaper at launch.
Detailed category analysis
performance
In the "performance" category, the OnePlus Ace 6 Ultra significantly outperforms the Redmi K40 (94/100 vs 61/100).
display
In the "display" category, the OnePlus Ace 6 Ultra notably outperforms the Redmi K40 (94/100 vs 79/100).
camera
In the "camera" category, the Redmi K40 and the OnePlus Ace 6 Ultra are nearly equal (36/100 vs 35/100).
battery
In the "battery" category, the OnePlus Ace 6 Ultra significantly outperforms the Redmi K40 (82/100 vs 42/100).
portability
In the "portability" category, the Redmi K40 notably outperforms the OnePlus Ace 6 Ultra (64/100 vs 43/100).
Frequently asked questions
Which is better: the OnePlus Ace 6 Ultra or the Redmi K40?
The OnePlus Ace 6 Ultra significantly outperforms the Redmi K40 by 20 points (74/100 vs 54/100).
What is the rating of the OnePlus Ace 6 Ultra and the Redmi K40?
The OnePlus Ace 6 Ultra has a MobileRank rating of 74/100, the Redmi K40 — 54/100.
Which is more powerful: the OnePlus Ace 6 Ultra or the Redmi K40?
The OnePlus Ace 6 Ultra leads on performance (94/100 vs 61/100).
Should you choose the OnePlus Ace 6 Ultra over the Redmi K40?
The OnePlus Ace 6 Ultra is a better fit for gamers and power users, those who care about battery life. The Redmi K40 is a better fit for active users.