400 Pro vs 15 Ultra

Phone 1

Phone 2

Winner

Honor 400 Pro

Lifespan decides this one: the 400 Pro is supported until May 2031 at $11.81 per month of safe use, while the 15 Ultra runs out in Mar 2030 ($30.27/month). On a which-lasts-longer question, that's not a tie — it's the whole answer.

Value Score: 400 Pro 70 · 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.

Honor 400 Pro $700

Safe to buy$11.81/mo

2025◆ Buy-by May 20292031

Xiaomi 15 Ultra $1350

Safe to buy$30.27/mo

2025◆ Buy-by Mar 20282030

Category by category

Display

400 Pro 7015 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

400 Pro 9215 Ultra 98

The 15 Ultra's Qualcomm Snapdragon 8 Elite (3nm) is simply the faster chip.

Camera

400 Pro 8415 Ultra 96

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

Battery

400 Pro 8615 Ultra 88

Battery capacities are close enough not to decide this.

Software longevity

400 Pro 7115 Ultra 53

The 400 Pro is supported until May 2031 — 15 months longer than the 15 Ultra.

Value

400 Pro 7015 Ultra 65

Overall value goes to the 400 Pro at $11.81 per month of safe use.

Full spec table

Spec	400 Pro	15 Ultra
Price (street)	$700	$1350
Display	6.7-inch AMOLED, 2800x1280, 120Hz	6.73-inch 2K (1440×3200) LTPO AMOLED, 1–120Hz, up to 3200 nits peak
Chipset	Qualcomm Snapdragon 8 Gen 3	Qualcomm Snapdragon 8 Elite (3nm)
RAM	12GB/16GB	16GB
Storage	256GB/512GB	512GB/1TB
Battery	5,300 mAh	5,410 mAh
Charging	100W wired, 50W wireless	90W wired, 80W wireless
Rear cameras	200MP main, 50MP telephoto 3x, 12MP ultra-wide	50MP main, 50MP ultra-wide, 50MP telephoto (70mm floating), 200MP periscope telephoto
Dimensions	160.8 × 76.1 × 8.1 mm	161.3 × 75.3 × 9.35 mm
Weight	205 g	226 g
Water resistance	IP68/IP69	IP68
Supported until	May 2031	Mar 2030

400 Pro 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.