400 vs 15T

Phone 1

Phone 2

Winner

Honor 400

The 400 wins this one, taking display and software longevity decisively. Against the 15T it's also the sounder buy at $5.92 per month of safe use.

Value Score: 400 76 · 15T 70 — methodology

The lifespan decider

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

Honor 400 $350

Safe to buy$5.92/mo

2025◆ Buy-by May 20292031

Xiaomi 15T $500

Safe to buy$9.76/mo

2025◆ Buy-by Sep 20282030

Category by category

Display

400 8015T 70

The 400's screen is the better one — 6.55-inch amoled, 1.5k, 120hz, 5000 nits peak.

Performance

400 6415T 78

The 15T's MediaTek Dimensity 8400-Ultra is simply the faster chip.

Camera

400 7215T 79

The 15T has the stronger camera system (3 real rear lenses vs 2).

Battery

400 8615T 90

5,500mAh vs 5,300mAh — the 15T lasts longer between charges.

Software longevity

400 7015T 61

The 400 is supported until May 2031 — 8 months longer than the 15T.

Value

400 7615T 70

Overall value goes to the 400 at $5.92 per month of safe use.

Full spec table

Spec	400	15T
Price (street)	$350	$500
Display	6.55-inch AMOLED, 1.5K, 120Hz, 5000 nits peak	6.83-inch AMOLED, 2772x1280, 144Hz
Chipset	Qualcomm Snapdragon 7 Gen 3 (4nm)	MediaTek Dimensity 8400-Ultra
RAM	8GB/12GB	12GB
Storage	256GB/512GB	256GB/512GB
Battery	5,300 mAh	5,500 mAh
Charging	66W wired (5300mAh EU model), 5W reverse wired	67W wired
Rear cameras	200MP main, 12MP ultra-wide	50MP main, 50MP telephoto 2x, 12MP ultra-wide
Dimensions	156.5 × 74.6 × 7.3 mm	163.2 × 78.0 × 7.5 mm
Weight	184 g	194 g
Water resistance	IP65/IP66 (market dependent)	IP68
Supported until	May 2031	Sep 2030

400 full verdict →15T 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.