PhoneLifespan

15 vs 15 Ultra

vs

It depends

Too close to call outright

These two are within 2 points overall — it genuinely depends on price on the day. The 15 edges both longevity and performance, so prefer it when prices are close.

Value Score: 15 67 · 15 Ultra 65 methodology

The lifespan decider

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

Xiaomi 15 $750
Safe to buy$16.81/mo
2025◆ Buy-by Mar 20282030
Xiaomi 15 Ultra $1350
Safe to buy$30.26/mo
2025◆ Buy-by Mar 20282030

Category by category

Display
15 9015 Ultra 100

The 15 Ultra's screen is the better one — 6.73-inch 2k (1440×3200) ltpo amoled, 1–120hz, up to 3200 nits peak.

Performance
15 9815 Ultra 98

Performance is a wash — same chip tier.

Camera
15 7915 Ultra 96

The 15 Ultra has the stronger camera system (4 real rear lenses vs 3).

Battery
15 8515 Ultra 88

5,410mAh vs 5,240mAh — the 15 Ultra lasts longer between charges.

Software longevity
15 5315 Ultra 53

Both phones' support windows end around the same time.

Value
15 6715 Ultra 65

Pound for pound, these two are equally good deals.

Full spec table
Spec1515 Ultra
Price (street)$750$1350
Display6.36-inch CrystalRes AMOLED, 2670×1200 (460 ppi), 1–120Hz LTPO, up to 3200 nits peak, Dolby Vision/HDR10+6.73-inch 2K (1440×3200) LTPO AMOLED, 1–120Hz, up to 3200 nits peak
ChipsetSnapdragon 8 EliteQualcomm Snapdragon 8 Elite (3nm)
RAM12GB16GB
Storage256GB/512GB512GB/1TB
Battery5,240 mAh5,410 mAh
Charging90W wired, 50W wireless90W wired, 80W wireless
Rear cameras50MP main (Light Fusion 900, f/1.62), 50MP ultra-wide, 50MP telephoto (Leica 60mm floating)50MP main, 50MP ultra-wide, 50MP telephoto (70mm floating), 200MP periscope telephoto
Dimensions152.3 × 71.2 × 8.08 mm161.3 × 75.3 × 9.35 mm
Weight191 g226 g
Water resistanceIP68IP68
Supported untilMar 2030Mar 2030

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