400 Pro vs Open

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 Open runs out in Oct 2028 ($31.91/month). On a which-lasts-longer question, that's not a tie — it's the whole answer.

Value Score: 400 Pro 70 · Open 57 — 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

OnePlus Open $900

Buy with care$31.91/mo

2023◆ Buy-by Oct 20262028

Category by category

Display

400 Pro 70Open 90

The Open's screen is the better one — 7.82-inch 2k ltpo3 fluid amoled inner foldable (2440×2268, 426 ppi) + 6.31-inch 2k amoled cover (2484×1116, 431 ppi), both 120hz, up to 2800 nits peak.

Performance

400 Pro 92Open 85

The 400 Pro's Qualcomm Snapdragon 8 Gen 3 is simply the faster chip.

Camera

400 Pro 84Open 79

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

Battery

400 Pro 86Open 76

5,300mAh vs 4,805mAh — the 400 Pro lasts longer between charges.

Software longevity

400 Pro 71Open 34

The 400 Pro is supported until May 2031 — 31 months longer than the Open.

Value

400 Pro 70Open 57

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

Full spec table

Spec	400 Pro	Open
Price (street)	$700	$900
Display	6.7-inch AMOLED, 2800x1280, 120Hz	7.82-inch 2K LTPO3 Fluid AMOLED inner foldable (2440×2268, 426 ppi) + 6.31-inch 2K AMOLED cover (2484×1116, 431 ppi), both 120Hz, up to 2800 nits peak
Chipset	Qualcomm Snapdragon 8 Gen 3	Snapdragon 8 Gen 2
RAM	12GB/16GB	16GB
Storage	256GB/512GB	512GB
Battery	5,300 mAh	4,805 mAh
Charging	100W wired, 50W wireless	67W SUPERVOOC wired, no wireless
Rear cameras	200MP main, 50MP telephoto 3x, 12MP ultra-wide	48MP main, 48MP ultra-wide, 64MP periscope telephoto 3x
Dimensions	160.8 × 76.1 × 8.1 mm	Unfolded 153.4 × 143.1 × 5.8 mm; Folded 153.4 × 73.3 × 11.7 mm
Weight	205 g	239 g
Water resistance	IP68/IP69	IPX4
Supported until	May 2031	Oct 2028

400 Pro full verdict →Open 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.