X100 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 X100 runs out in Nov 2028 ($21.16/month). On a which-lasts-longer question, that's not a tie — it's the whole answer.

Value Score: X100 64 · 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.

Vivo X100 $620

Buy with care$21.16/mo

2023◆ Buy-by Nov 20262028

Xiaomi 15 $750

Safe to buy$16.81/mo

2025◆ Buy-by Mar 20282030

Category by category

Display

X100 9015 90

Both displays are effectively the same class.

Performance

X100 9315 98

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

Camera

X100 7915 79

Camera systems are comparable on paper — pick by sample photos.

Battery

X100 8015 85

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

Software longevity

X100 3515 53

The 15 is supported until Mar 2030 — 15 months longer than the X100.

Value

X100 6415 67

Pound for pound, these two are equally good deals.

Full spec table

Spec	X100	15
Price (street)	$620	$750
Display	6.78-inch LTPO AMOLED, 2800x1260, 120Hz, up to 3000 nits peak	6.36-inch CrystalRes AMOLED, 2670×1200 (460 ppi), 1–120Hz LTPO, up to 3200 nits peak, Dolby Vision/HDR10+
Chipset	MediaTek Dimensity 9300	Snapdragon 8 Elite
RAM	12GB/16GB	12GB
Storage	256GB/512GB	256GB/512GB
Battery	5,000 mAh	5,240 mAh
Charging	120W wired	90W wired, 50W wireless
Rear cameras	50MP main, 50MP ultra-wide, 64MP telephoto 3x periscope	50MP main (Light Fusion 900, f/1.62), 50MP ultra-wide, 50MP telephoto (Leica 60mm floating)
Dimensions	164.1 × 75.3 × 8.2 mm	152.3 × 71.2 × 8.08 mm
Weight	202 g	191 g
Water resistance	IP68	IP68
Supported until	Nov 2028	Mar 2030

X100 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.