X100 Ultra vs 15T Pro

Phone 1

Phone 2

Winner

Xiaomi 15T Pro

Lifespan decides this one: the 15T Pro is supported until Sep 2030 at $12.69 per month of safe use, while the X100 Ultra runs out in May 2029 ($20.39/month). On a which-lasts-longer question, that's not a tie — it's the whole answer.

Value Score: X100 Ultra 66 · 15T Pro 69 — 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 Ultra $720

Buy with care$20.39/mo

2024◆ Buy-by May 20272029

Xiaomi 15T Pro $650

Safe to buy$12.69/mo

2025◆ Buy-by Sep 20282030

Category by category

Display

X100 Ultra 9015T Pro 70

The X100 Ultra's screen is the better one — 6.78-inch ltpo amoled, 120hz, 3000 nits peak.

Performance

X100 Ultra 9215T Pro 94

Performance is a wash — same chip tier.

Camera

X100 Ultra 8415T Pro 79

The X100 Ultra has the stronger camera system — same lens count, higher-grade sensors.

Battery

X100 Ultra 9015T Pro 90

Battery capacities are close enough not to decide this.

Software longevity

X100 Ultra 4215T Pro 61

The 15T Pro is supported until Sep 2030 — 16 months longer than the X100 Ultra.

Value

X100 Ultra 6615T Pro 69

Pound for pound, these two are equally good deals.

Full spec table

Spec	X100 Ultra	15T Pro
Price (street)	$720	$650
Display	6.78-inch LTPO AMOLED, 120Hz, 3000 nits peak	6.83-inch AMOLED, 2772x1280, 144Hz
Chipset	Snapdragon 8 Gen 3	MediaTek Dimensity 9400+
RAM	12GB/16GB	12GB
Storage	256GB/512GB/1TB	256GB/512GB/1TB
Battery	5,500 mAh	5,500 mAh
Charging	80W wired, 30W wireless	90W wired, 50W wireless
Rear cameras	50MP main, 200MP periscope telephoto, 50MP ultra-wide	50MP main, 50MP telephoto 5x periscope, 12MP ultra-wide
Dimensions	164.1 x 75.6 x 9.2 mm	162.7 × 77.9 × 8.0 mm
Weight	229 g	210 g
Water resistance	IP68/IP69	IP68
Supported until	May 2029	Sep 2030

X100 Ultra full verdict →15T Pro 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.