Galaxy S23 Ultra vs Redmi 15 5G

Phone 1

Phone 2

Winner

Xiaomi Redmi 15 5G

Lifespan decides this one: the Redmi 15 5G is supported until Aug 2029 at $4.80 per month of safe use, while the Galaxy S23 Ultra runs out in Feb 2028 ($16.94/month). On a which-lasts-longer question, that's not a tie — it's the whole answer.

Value Score: Galaxy S23 Ultra 76 · Redmi 15 5G 75 — methodology

The lifespan decider

When specs are close, support length decides it — this is what each phone costs per month of safe use.

Samsung Galaxy S23 Ultra $339

Buy with care$16.94/mo

2023◆ Buy-by Feb 20262028

Xiaomi Redmi 15 5G $180

Safe to buy$4.80/mo

2025◆ Buy-by Aug 20272029

Category by category

Display

Galaxy S23 Ultra 90Redmi 15 5G 70

The Galaxy S23 Ultra's screen is the better one — 6.8-inch dynamic amoled 2x, qhd+, ltpo 1–120hz, 1750 nits peak.

Performance

Galaxy S23 Ultra 85Redmi 15 5G 46

The Galaxy S23 Ultra's Snapdragon 8 Gen 2 for Galaxy is simply the faster chip.

Camera

Galaxy S23 Ultra 96Redmi 15 5G 55

The Galaxy S23 Ultra has the stronger camera system (4 real rear lenses vs 1).

Battery

Galaxy S23 Ultra 80Redmi 15 5G 100

7,000mAh vs 5,000mAh — the Redmi 15 5G lasts longer between charges.

Software longevity

Galaxy S23 Ultra 24Redmi 15 5G 45

The Redmi 15 5G is supported until Aug 2029 — 17 months longer than the Galaxy S23 Ultra.

Value

Galaxy S23 Ultra 76Redmi 15 5G 75

Pound for pound, these two are equally good deals.

Full spec table

Spec	Galaxy S23 Ultra	Redmi 15 5G
Price (street)	$339	$180
Display	6.8-inch Dynamic AMOLED 2X, QHD+, LTPO 1–120Hz, 1750 nits peak	6.9-inch IPS LCD, FHD+, 144Hz, 850 nits peak
Chipset	Snapdragon 8 Gen 2 for Galaxy	Qualcomm Snapdragon 6s Gen 3
RAM	8GB/12GB	4GB/6GB/8GB
Storage	256GB/512GB/1TB	128GB/256GB
Battery	5,000 mAh	7,000 mAh
Charging	45W wired, 15W wireless, 4.5W reverse wireless	33W wired, 18W reverse wired
Rear cameras	200MP main, 12MP ultra-wide, 10MP telephoto 3x, 10MP periscope 10x	50MP main, 2MP depth
Dimensions	163.4 × 78.1 × 8.9 mm	169.5 × 80.5 × 8.4 mm
Weight	234 g	217 g
Water resistance	IP68	IP64
Supported until	Feb 2028	Aug 2029

Galaxy S23 Ultra full verdict →Redmi 15 5G full verdict →Longevity master board →

Scores and verdicts are computed from our verified database — see exactly how. Specs from manufacturer documentation; prices reflect major US retailers.