13 Ultra vs 15

Phone 1

Phone 2

Winner

Xiaomi 15

Lifespan decides this one: the 15 is supported until Mar 2030 at $16.81 per month of safe use, while the 13 Ultra runs out in Apr 2028 ($29.32/month). On a which-lasts-longer question, that's not a tie — it's the whole answer.

Value Score: 13 Ultra 62 · 15 67 — methodology

The lifespan decider

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

Xiaomi 13 Ultra $650

Buy with care$29.32/mo

2023◆ Buy-by Apr 20262028

Xiaomi 15 $750

Safe to buy$16.81/mo

2025◆ Buy-by Mar 20282030

Category by category

Display

13 Ultra 9015 90

Both displays are effectively the same class.

Performance

13 Ultra 8515 98

The 15's Snapdragon 8 Elite is simply the faster chip.

Camera

13 Ultra 9115 79

The 13 Ultra has the stronger camera system (4 real rear lenses vs 3).

Battery

13 Ultra 8015 85

5,240mAh vs 5,000mAh — the 15 lasts longer between charges.

Software longevity

13 Ultra 2615 53

The 15 is supported until Mar 2030 — 22 months longer than the 13 Ultra.

Value

13 Ultra 6215 67

Overall value goes to the 15 at $16.81 per month of safe use.

Full spec table

Spec	13 Ultra	15
Price (street)	$650	$750
Display	6.73-inch LTPO AMOLED, 3200 x 1440, 120Hz	6.36-inch CrystalRes AMOLED, 2670×1200 (460 ppi), 1–120Hz LTPO, up to 3200 nits peak, Dolby Vision/HDR10+
Chipset	Qualcomm Snapdragon 8 Gen 2	Snapdragon 8 Elite
RAM	12GB/16GB	12GB
Storage	256GB/512GB/1TB	256GB/512GB
Battery	5,000 mAh	5,240 mAh
Charging	90W wired, 50W wireless	90W wired, 50W wireless
Rear cameras	50MP main, 50MP ultra-wide, 50MP telephoto 3.2x, 50MP periscope telephoto 5x	50MP main (Light Fusion 900, f/1.62), 50MP ultra-wide, 50MP telephoto (Leica 60mm floating)
Dimensions	163.2 × 74.6 × 9.1 mm	152.3 × 71.2 × 8.08 mm
Weight	227 g	191 g
Water resistance	IP68	IP68
Supported until	Apr 2028	Mar 2030

13 Ultra full verdict →15 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.