400 vs Redmi K70 Ultra

Phone 1

Phone 2

Winner

Honor 400

Lifespan decides this one: the 400 is supported until May 2031 at $5.92 per month of safe use, while the Redmi K70 Ultra runs out in Jul 2028 ($15.17/month). On a which-lasts-longer question, that's not a tie — it's the whole answer.

Value Score: 400 76 · Redmi K70 Ultra 73 — 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 Redmi K70 Ultra $380

Buy with care$15.17/mo

2024◆ Buy-by Jul 20262028

Category by category

Display

400 80Redmi K70 Ultra 80

Both displays are effectively the same class.

Performance

400 64Redmi K70 Ultra 95

The Redmi K70 Ultra's MediaTek Dimensity 9300+ (4nm) is simply the faster chip.

Camera

400 72Redmi K70 Ultra 67

The 400 has the stronger camera system — same lens count, higher-grade sensors.

Battery

400 86Redmi K70 Ultra 90

5,500mAh vs 5,300mAh — the Redmi K70 Ultra lasts longer between charges.

Software longevity

400 70Redmi K70 Ultra 30

The 400 is supported until May 2031 — 34 months longer than the Redmi K70 Ultra.

Value

400 76Redmi K70 Ultra 73

Pound for pound, these two are equally good deals.

Full spec table

Spec	400	Redmi K70 Ultra
Price (street)	$350	$380
Display	6.55-inch AMOLED, 1.5K, 120Hz, 5000 nits peak	6.67-inch AMOLED, 1.5K, 144Hz, 4000 nits peak, Dolby Vision
Chipset	Qualcomm Snapdragon 7 Gen 3 (4nm)	MediaTek Dimensity 9300+ (4nm)
RAM	8GB/12GB	12GB/16GB/24GB
Storage	256GB/512GB	256GB/512GB/1TB
Battery	5,300 mAh	5,500 mAh
Charging	66W wired (5300mAh EU model), 5W reverse wired	120W wired
Rear cameras	200MP main, 12MP ultra-wide	50MP main, 8MP ultra-wide, 2MP macro
Dimensions	156.5 × 74.6 × 7.3 mm	160.4 × 75.1 × 8.4 mm
Weight	184 g	211 g
Water resistance	IP65/IP66 (market dependent)	IP68
Supported until	May 2031	Jul 2028

400 full verdict →Redmi K70 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.