Samsung Galaxy A51 vs Samsung Galaxy S25 Ultra
The Samsung Galaxy A51 (2020) runs on the Exynos 9611, while the Samsung Galaxy S25 Ultra (2025) runs on the Qualcomm Snapdragon 8 Elite; launch prices were $399 and $1299. By overall MobileRank rating, the Samsung Galaxy S25 Ultra leads — 80/100 vs 34/100 (a 46-point difference). Key differences: the Samsung Galaxy S25 Ultra has the bigger battery (5000 mAh vs 4000); the main camera is 48 MP vs 200 MP; the Samsung Galaxy S25 Ultra is faster in AnTuTu (3,128,552 vs 355,351); the Samsung Galaxy A51 is noticeably lighter (172g vs 218g).
Profile comparison
Category scores
Samsung Galaxy A51
Samsung Galaxy S25 Ultra
What makes Samsung Galaxy A51 better?
- Lighter: 172g vs 218g
- Cheaper at launch: $399 vs $1299
- Better portability (77/100 vs 46/100)
What makes Samsung Galaxy S25 Ultra better?
- Higher AnTuTu: 3128552 vs 355351
- Better Geekbench Single: 3100 vs 365
- Better Geekbench Multi: 9760 vs 1107
- Bigger battery: 5000 vs 4000 mAh
- Better main camera: 200MP vs 48MP
- Higher refresh rate: 120Hz vs 60Hz
- Higher performance (92/100 vs 25/100)
- Better camera (81/100 vs 36/100)
- Longer battery life (56/100 vs 25/100)
- Better display (88/100 vs 51/100)
Comparison verdict
Comparing the Samsung Galaxy A51 vs the Samsung Galaxy S25 Ultra, the Samsung Galaxy S25 Ultra scores 46 points higher (80/100 vs 34/100). In the "performance" category, the Samsung Galaxy S25 Ultra leads (92/100 vs 25/100). In the "camera" category, the Samsung Galaxy S25 Ultra leads (81/100 vs 36/100). In the "battery" category, the Samsung Galaxy S25 Ultra leads (56/100 vs 25/100). Value score: Samsung Galaxy A51 — 0/100, Samsung Galaxy S25 Ultra — 70/100; 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 Samsung Galaxy S25 Ultra significantly outperforms the Samsung Galaxy A51 (92/100 vs 25/100). In the "display" category, the Samsung Galaxy S25 Ultra significantly outperforms the Samsung Galaxy A51 (88/100 vs 51/100). In the "camera" category, the Samsung Galaxy S25 Ultra significantly outperforms the Samsung Galaxy A51 (81/100 vs 36/100). In the "battery" category, the Samsung Galaxy S25 Ultra significantly outperforms the Samsung Galaxy A51 (56/100 vs 25/100). In the "portability" category, the Samsung Galaxy A51 significantly outperforms the Samsung Galaxy S25 Ultra (77/100 vs 46/100).
Specs comparison
| Specification | Samsung Galaxy A51 | Samsung Galaxy S25 Ultra | |
|---|---|---|---|
| Processor | Exynos 9611 | Qualcomm Snapdragon 8 Elite | |
| AnTuTu | 355351 | 3128552 | |
| Geekbench Single | 365 | 3100 | |
| Geekbench Multi | 1107 | 9760 | |
| Display | 6.5" AMOLED | 6.9" Dynamic AMOLED 2X | |
| Resolution | — | 3120x1440 | |
| Refresh rate | 60 Hz | 120 Hz | |
| Battery | 4000 mAh | 5000 mAh | |
| Charging | — | 45W | |
| Wireless charging | 0W | 15W | |
| DXOMark (camera) | — | 151 | |
| Main camera | 48 MP | 200 MP | |
| Ultrawide | 0 MP | 50 MP | |
| Telephoto | 0 MP | 50 MP | |
| Front camera | 32 MP | 12 MP | |
| RAM | 4GB / 6GB | 12GB / 16GB | |
| Storage | 64GB / 128GB | 256GB / 512GB / 1TB | |
| OS | — | Android 15 / One UI 7 | |
| Brightness (peak) | — | 2600 nits | |
| NFC | yes | yes | |
| Protection | — | IP68 | |
| Dimensions | 158.5×73.6×7.9 mm | 162.8×77.6×8.2 mm | |
| Weight | 172 g | 218 g | |
| Launch price | $399 | $1299 |
Camera comparison
Samsung Galaxy A51
- Main: 48MP
- Front: 32MP
Samsung Galaxy S25 Ultra
- Main: 200MP f/1.7
- Ultrawide: 50MP
- Telephoto: 50MP
- Front: 12MP
Display comparison
Samsung Galaxy A51
- 6.5" AMOLED
- Refresh rate: 60 Hz
Samsung Galaxy S25 Ultra
- 6.9" Dynamic AMOLED 2X
- Resolution: 3120x1440
- Refresh rate: 120 Hz
Battery and charging
Samsung Galaxy A51
- 4000 mAh
- No wireless charging
Samsung Galaxy S25 Ultra
- 5000 mAh
- NanoReview test: web browsing 11:10 hrs, total 28:43 hrs
- Wired: 45W
- Wireless: 15W
Overall performance score
We compared Samsung Galaxy A51 and Samsung Galaxy S25 Ultra, covering their specs and all relevant benchmarks.
Samsung Galaxy S25 Ultra leads Samsung Galaxy A51 by 88.6% in our overall performance rating.
Benchmarks
Launch prices and where to check today's
Launch price difference: $900. Samsung Galaxy A51 was $900 cheaper at launch.
Detailed category analysis
performance
In the "performance" category, the Samsung Galaxy S25 Ultra significantly outperforms the Samsung Galaxy A51 (92/100 vs 25/100).
display
In the "display" category, the Samsung Galaxy S25 Ultra significantly outperforms the Samsung Galaxy A51 (88/100 vs 51/100).
camera
In the "camera" category, the Samsung Galaxy S25 Ultra significantly outperforms the Samsung Galaxy A51 (81/100 vs 36/100).
battery
In the "battery" category, the Samsung Galaxy S25 Ultra significantly outperforms the Samsung Galaxy A51 (56/100 vs 25/100).
portability
In the "portability" category, the Samsung Galaxy A51 significantly outperforms the Samsung Galaxy S25 Ultra (77/100 vs 46/100).
Frequently asked questions
Which is better: the Samsung Galaxy A51 or the Samsung Galaxy S25 Ultra?
The Samsung Galaxy S25 Ultra significantly outperforms the Samsung Galaxy A51 by 46 points (80/100 vs 34/100).
What is the rating of the Samsung Galaxy A51 and the Samsung Galaxy S25 Ultra?
The Samsung Galaxy A51 has a MobileRank rating of 34/100, the Samsung Galaxy S25 Ultra — 80/100.
Which has the better camera: the Samsung Galaxy A51 or the Samsung Galaxy S25 Ultra?
The Samsung Galaxy S25 Ultra leads on camera score (81/100 vs 36/100).
Which is more powerful: the Samsung Galaxy A51 or the Samsung Galaxy S25 Ultra?
The Samsung Galaxy S25 Ultra leads on performance (92/100 vs 25/100).
Should you choose the Samsung Galaxy A51 over the Samsung Galaxy S25 Ultra?
The Samsung Galaxy S25 Ultra is a better fit for gamers and power users, mobile photography enthusiasts.