PhoneLifespan

13 vs 15 Ultra

vs

Winner

OnePlus 13

Lifespan decides this one: the 13 is supported until Jan 2031 at $14.21 per month of safe use, while the 15 Ultra runs out in Mar 2030 ($30.26/month). On a which-lasts-longer question, that's not a tie — it's the whole answer.

Value Score: 13 74 · 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.

OnePlus 13 $779
Safe to buy$14.21/mo
2025◆ Buy-by Jan 20292031
Xiaomi 15 Ultra $1350
Safe to buy$30.26/mo
2025◆ Buy-by Mar 20282030

Category by category

Display
13 10015 Ultra 100

Both displays are effectively the same class.

Performance
13 9815 Ultra 98

Performance is a wash — same chip tier.

Camera
13 7915 Ultra 96

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

Battery
13 10015 Ultra 88

6,000mAh vs 5,410mAh — the 13 lasts longer between charges.

Software longevity
13 6515 Ultra 53

The 13 is supported until Jan 2031 — 10 months longer than the 15 Ultra.

Value
13 7415 Ultra 65

Overall value goes to the 13 at $14.21 per month of safe use.

Full spec table
Spec1315 Ultra
Price (street)$779$1350
Display6.82-inch LTPO AMOLED, QHD+, 1–120Hz, up to 4500 nits peak6.73-inch 2K (1440×3200) LTPO AMOLED, 1–120Hz, up to 3200 nits peak
ChipsetSnapdragon 8 EliteQualcomm Snapdragon 8 Elite (3nm)
RAM12GB/16GB16GB
Storage256GB/512GB512GB/1TB
Battery6,000 mAh5,410 mAh
Charging100W wired SUPERVOOC, 50W AIRVOOC wireless90W wired, 80W wireless
Rear cameras50MP main, 50MP ultra-wide, 50MP periscope 3x50MP main, 50MP ultra-wide, 50MP telephoto (70mm floating), 200MP periscope telephoto
Dimensions162.9 × 76.5 × 8.5 mm161.3 × 75.3 × 9.35 mm
Weight210 g226 g
Water resistanceIP68/IP69IP68
Supported untilJan 2031Mar 2030
13 full verdict →15 Ultra 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.