Open vs 15

Phone 1

Phone 2

Winner

Xiaomi 15

Lifespan decides this one: the 15 is supported until Mar 2030 at $16.81 per month of safe use, while the Open runs out in Oct 2028 ($31.90/month). On a which-lasts-longer question, that's not a tie — it's the whole answer.

Value Score: Open 57 · 15 67 — methodology

The lifespan decider

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

OnePlus Open $900

Buy with care$31.90/mo

2023◆ Buy-by Oct 20262028

Xiaomi 15 $750

Safe to buy$16.81/mo

2025◆ Buy-by Mar 20282030

Category by category

Display

Open 9015 90

Both displays are effectively the same class.

Performance

Open 8515 98

The 15's Snapdragon 8 Elite is simply the faster chip.

Camera

Open 7915 79

Camera systems are comparable on paper — pick by sample photos.

Battery

Open 7615 85

5,240mAh vs 4,805mAh — the 15 lasts longer between charges.

Software longevity

Open 3415 53

The 15 is supported until Mar 2030 — 16 months longer than the Open.

Value

Open 5715 67

Overall value goes to the 15 at $16.81 per month of safe use.

Full spec table

Spec	Open	15
Price (street)	$900	$750
Display	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	6.36-inch CrystalRes AMOLED, 2670×1200 (460 ppi), 1–120Hz LTPO, up to 3200 nits peak, Dolby Vision/HDR10+
Chipset	Snapdragon 8 Gen 2	Snapdragon 8 Elite
RAM	16GB	12GB
Storage	512GB	256GB/512GB
Battery	4,805 mAh	5,240 mAh
Charging	67W SUPERVOOC wired, no wireless	90W wired, 50W wireless
Rear cameras	48MP main, 48MP ultra-wide, 64MP periscope telephoto 3x	50MP main (Light Fusion 900, f/1.62), 50MP ultra-wide, 50MP telephoto (Leica 60mm floating)
Dimensions	Unfolded 153.4 × 143.1 × 5.8 mm; Folded 153.4 × 73.3 × 11.7 mm	152.3 × 71.2 × 8.08 mm
Weight	239 g	191 g
Water resistance	IPX4	IP68
Supported until	Oct 2028	Mar 2030

Open full verdict →15 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.