OnePlus 15 vs Samsung Galaxy S26 Ultra

How they differ in real use

Built from our best battery phones scoring, each product's published specifications, and verified owner feedback — not hands-on testing.

Both the OnePlus 15 and the Samsung Galaxy S26 Ultra made our Top 5 Gaming Phones, at #2 (best premium) and #5. ASUS confirmed it has no ROG Phone 10 for 2026 and has since exited the phone business entirely, and the ROG Phone 9 Pro it leaves behind is now out of stock across Amazon and ASUS's own store. The OnePlus 15 is the strongest mainstream stand-in: Snapdragon 8 Elite Gen 5, a 165Hz LTPO OLED display (higher than the ROG Phone 9 Pro's own panel), and a roughly 7,000mAh battery with 120W wired charging. Its triple-layer vapor-chamber cooling still throttles to about 60% of peak after 30+ minutes of sustained gaming load, per a HotHardware review, and it has no dedicated shoulder triggers. All-rounder flagship running the Snapdragon 8 Elite Gen 5 for Galaxy: GSMArena found it runs demanding titles at higher graphics settings than the Tensor-powered Pixel 10 series can manage. Game Booster, a 6.9" display, and the S Pen for strategy games round it out; it ranks below the dedicated gaming phones because it lacks triggers and active cooling.

We score gaming phones on Performance (35%), Display (25%), Cooling (20%), Gaming Features (10%) and Battery Life (10%). On that basis the OnePlus 15 totals 8.8 out of 10 and the Samsung Galaxy S26 Ultra 8.5. The widest gap is Display, where the OnePlus 15 scores 10 against 9 for the Samsung Galaxy S26 Ultra: refresh rate. Gaming Features also separates them: 7 for the Samsung Galaxy S26 Ultra versus 5 for the OnePlus 15.

On paper, the specifications that actually differ: Display: 6.78" LTPO AMOLED, 2780x1264, 120Hz on the OnePlus 15 versus 6.9" Dynamic AMOLED 2X, 3120x1440, 120Hz on the Samsung Galaxy S26 Ultra; Processor: Snapdragon 8 Elite on the OnePlus 15 versus Snapdragon 8 Elite Gen 5 for Galaxy on the Samsung Galaxy S26 Ultra; Storage: 256GB/512GB on the OnePlus 15 versus 256GB-1TB on the Samsung Galaxy S26 Ultra; Battery: 7,300mAh Si-C, 100W wired, 50W wireless on the OnePlus 15 versus 5,000mAh, 60W wired, 25W wireless on the Samsung Galaxy S26 Ultra; Camera: 50MP triple system on the OnePlus 15 versus 200MP f/1.4 main + 50MP ultrawide + 50MP 5x + 10MP 3x telephoto on the Samsung Galaxy S26 Ultra. They match on RAM.

Check current pricing at the merchant links below. Owners praise the OnePlus 15 for 25+ hours longest tested and 7,300mAh silicon-carbon; the most common complaint is large phone. Owners praise the Samsung Galaxy S26 Ultra for 200MP main camera now f/1.4 (47% more light for low-light shots) and privacy Display blocks side-angle viewing, first on any phone; the most common complaint is $1,299 list price with pricier storage upgrades.