Open vs 15 Ultra

Phone 1

Phone 2

Winner

Xiaomi 15 Ultra

Lifespan decides this one: the 15 Ultra is supported until Mar 2030 at $30.26 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 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.

OnePlus Open $900

Buy with care$31.90/mo

2023◆ Buy-by Oct 20262028

Xiaomi 15 Ultra $1350

Safe to buy$30.26/mo

2025◆ Buy-by Mar 20282030

Category by category

Display

Open 9015 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

Open 8515 Ultra 98

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

Camera

Open 7915 Ultra 96

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

Battery

Open 7615 Ultra 88

5,410mAh vs 4,805mAh — the 15 Ultra lasts longer between charges.

Software longevity

Open 3415 Ultra 53

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

Value

Open 5715 Ultra 65

Overall value goes to the 15 Ultra at $30.26 per month of safe use.

Full spec table

Spec	Open	15 Ultra
Price (street)	$900	$1350
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	6.73-inch 2K (1440×3200) LTPO AMOLED, 1–120Hz, up to 3200 nits peak
Chipset	Snapdragon 8 Gen 2	Qualcomm Snapdragon 8 Elite (3nm)
RAM	16GB	16GB
Storage	512GB	512GB/1TB
Battery	4,805 mAh	5,410 mAh
Charging	67W SUPERVOOC wired, no wireless	90W wired, 80W wireless
Rear cameras	48MP main, 48MP ultra-wide, 64MP periscope telephoto 3x	50MP main, 50MP ultra-wide, 50MP telephoto (70mm floating), 200MP periscope telephoto
Dimensions	Unfolded 153.4 × 143.1 × 5.8 mm; Folded 153.4 × 73.3 × 11.7 mm	161.3 × 75.3 × 9.35 mm
Weight	239 g	226 g
Water resistance	IPX4	IP68
Supported until	Oct 2028	Mar 2030

Open 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.