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; estimated prices are $555 and $309. By overall MobileRank rating, the OnePlus Ace 6 Ultra leads — 66/100 vs 34/100 (a 32-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).
OnePlus Ace 6 Ultra
Redmi K40
- Higher AnTuTu: 3429868 vs 1010069
- Better Geekbench Single: 3228 vs 1298
- Better Geekbench Multi: 9553 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 (76/100 vs 8/100)
- Longer battery life (82/100 vs 28/100)
- Lighter: 196g vs 217g
- Cheaper: $309 vs $555
- Better design/ergonomics (55/100 vs 28/100)
- Better value for money (89/100 vs 72/100)
Comparing the OnePlus Ace 6 Ultra vs the Redmi K40, the OnePlus Ace 6 Ultra scores 32 points higher (66/100 vs 34/100). In the "performance" category, the OnePlus Ace 6 Ultra leads (76/100 vs 8/100). In the "battery" category, the OnePlus Ace 6 Ultra leads (82/100 vs 28/100). In the "value for money" category, the Redmi K40 leads (89/100 vs 72/100). In the "performance" category, the OnePlus Ace 6 Ultra significantly outperforms the Redmi K40 (76/100 vs 8/100). In the "display" category, both devices are on the same level — 100/100. In the "camera" category, both devices are on the same level — 31/100. In the "battery" category, the OnePlus Ace 6 Ultra significantly outperforms the Redmi K40 (82/100 vs 28/100). In the "design" category, the Redmi K40 notably outperforms the OnePlus Ace 6 Ultra (55/100 vs 28/100). In the "value for money" category, the Redmi K40 notably outperforms the OnePlus Ace 6 Ultra (89/100 vs 72/100).
| Specification | OnePlus Ace 6 Ultra | Redmi K40 | |
|---|---|---|---|
| Processor | MediaTek Dimensity 9500 | Qualcomm Snapdragon 870 | |
| AnTuTu | 3429868 | 1010069 | |
| Geekbench Single | 3228 | 1298 | |
| Geekbench Multi | 9553 | 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 | — | |
| NFC | yes | — | |
| Protection | IP66 | — | |
| Dimensions | 162.5×77.5×8.5 mm | — | |
| Weight | 217 g | 196 g | |
| Price | $555 | $309 |
OnePlus Ace 6 Ultra
- Main: 50MP f/f/1.8
- Ultrawide: 8MP
- Front: 16MP
Redmi K40
- Main: 48MP f/1.79
- Ultrawide: 8MP
- Front: 20MP
OnePlus Ace 6 Ultra
- 6.8" AMOLED
- Resolution: 1272x2772
- Refresh rate: 165 Hz
Redmi K40
- 6.7" AMOLED
- Resolution: 2400x1080
- Refresh rate: 120 Hz
OnePlus Ace 6 Ultra
- 8600 mAh
- Wired: 120W
- No wireless charging
Redmi K40
- 4520 mAh
- Wired: 33W
- No wireless charging
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.
Price difference: $246. Redmi K40 is cheaper by $246.
performance
In the "performance" category, the OnePlus Ace 6 Ultra significantly outperforms the Redmi K40 (76/100 vs 8/100).
display
In the "display" category, both devices are on the same level — 100/100.
camera
In the "camera" category, both devices are on the same level — 31/100.
battery
In the "battery" category, the OnePlus Ace 6 Ultra significantly outperforms the Redmi K40 (82/100 vs 28/100).
design
In the "design" category, the Redmi K40 notably outperforms the OnePlus Ace 6 Ultra (55/100 vs 28/100).
value for money
In the "value for money" category, the Redmi K40 notably outperforms the OnePlus Ace 6 Ultra (89/100 vs 72/100).
Which is better: the OnePlus Ace 6 Ultra or the Redmi K40?
The OnePlus Ace 6 Ultra significantly outperforms the Redmi K40 by 32 points (66/100 vs 34/100).
What is the rating of the OnePlus Ace 6 Ultra and the Redmi K40?
The OnePlus Ace 6 Ultra has a MobileRank rating of 66/100, the Redmi K40 — 34/100.
Which is more powerful: the OnePlus Ace 6 Ultra or the Redmi K40?
The OnePlus Ace 6 Ultra leads on performance (76/100 vs 8/100).
Should you choose the OnePlus Ace 6 Ultra over the Redmi K40?
The OnePlus Ace 6 Ultra is a better fit for active users, those who care about battery life. The Redmi K40 is a better fit for budget-conscious buyers.