OnePlus 15 vs Samsung Galaxy S26 Ultra
OnePlus 15 (#1, best overall) vs Samsung Galaxy S26 Ultra (#5): in our Battery Life Phones scoring the OnePlus 15 totals 9.9/10 and the Samsung Galaxy S26 Ultra 8/10, the OnePlus 15 leading on Battery Life and Battery Capacity. At $899 versus $1,030, the OnePlus 15 costs $131 less.
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Side by side
| OnePlus 15 | Samsung Galaxy S26 Ultra | |
|---|---|---|
| Price | $899 | $1030 |
| Display | 6.78" LTPO AMOLED, 2780x1264, 120Hz | 6.9" Dynamic AMOLED 2X, 3120x1440, 120Hz |
| Processor | Snapdragon 8 Elite | Snapdragon 8 Elite Gen 5 for Galaxy |
| RAM | 12GB/16GB | 12GB/16GB |
| Storage | 256GB/512GB | 256GB-1TB |
| Battery | 7,300mAh Si-C, 100W wired, 50W wireless | 5,000mAh, 60W wired, 25W wireless |
| Camera | 50MP triple system | 200MP f/1.4 main + 50MP ultrawide + 50MP 5x + 10MP 3x telephoto |
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 Battery Life Phones, at #1 (best overall) and #5. Tom's Guide battery king at 25 hours 13 minutes—longest ever tested in US. First phone with genuine 2-day battery life using 7,300mAh silicon-carbon technology. 100W charging fills in 25 minutes. Tom's Guide measured 16 hours 10 minutes — over two hours longer than the Galaxy S25 Ultra from the same 5,000mAh cell, thanks to Snapdragon 8 Elite Gen 5 efficiency — and wired charging jumps from 45W to 60W. It trails the silicon-carbon phones above because Samsung hasn't adopted the higher-density battery tech yet.
We score battery life phones on Battery Life (40%), Battery Capacity (20%), Charging Speed (20%), Efficiency (10%) and Value (10%). On that basis the OnePlus 15 totals 9.9 out of 10 and the Samsung Galaxy S26 Ultra 8. The widest gap is Battery Life, where the OnePlus 15 scores 10 against 8 for the Samsung Galaxy S26 Ultra — hours. Battery Capacity also separates them: 10 for the OnePlus 15 versus 8 for the Samsung Galaxy S26 Ultra.
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.
Pricing as of July 18, 2026: $899 for the OnePlus 15 and $1,030 for the Samsung Galaxy S26 Ultra, a $131 difference in the OnePlus 15's favor. 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.
OnePlus 15
- 25+ hours longest tested
- 7,300mAh silicon-carbon
- 100W full charge 25 mins
- 50W wireless charging
- Large phone
- No telephoto
- OxygenOS not stock Android
Samsung Galaxy S26 Ultra
- 200MP main camera now f/1.4 — 47% more light for low-light shots
- Privacy Display blocks side-angle viewing, first on any phone
- Built-in S Pen and DeX desktop mode
- 60W wired charging up from 45W
- $1,299 list price with pricier storage upgrades
- Still 5,000mAh — no silicon-carbon battery like OnePlus and OPPO
- Large camera bump
Which should you buy?
The OnePlus 15 is the better fit for heavy users and multi-day travelers — it is the higher-scoring pick here, chiefly for Battery Life and Battery Capacity. The Samsung Galaxy S26 Ultra is the better fit for content creators and zoom photography. Since the OnePlus 15 is both the higher scorer and $131 cheaper, the Samsung Galaxy S26 Ultra only makes sense for content creators. The OnePlus 15 is a poor fit for compact phone seekers; the Samsung Galaxy S26 Ultra is a poor fit for compact phone seekers.
Choose the OnePlus 15 if
- Heavy users
- Multi-day travelers
- Power users
Skip it if
- Compact phone seekers
- Photography priority
Choose the Samsung Galaxy S26 Ultra if
- Content creators
- Zoom photography
- S Pen note-takers
Skip it if
- Compact phone seekers
- Clean Android preference
Common questions
Is the OnePlus 15 better than the Samsung Galaxy S26 Ultra?
In our Battery Life Phones ranking the OnePlus 15 scores higher overall, 9.9 to 8, with the biggest advantage in Battery Life. The Samsung Galaxy S26 Ultra does not out-score it on any criterion we weigh.
How much more does the Samsung Galaxy S26 Ultra cost than the OnePlus 15?
$131 more as of July 18, 2026: $1,030 for the Samsung Galaxy S26 Ultra against $899 for the OnePlus 15. Prices move, so the merchant page shows the current figure.
What is the main difference between the OnePlus 15 and the Samsung Galaxy S26 Ultra?
The headline spec difference is 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. In use, the gap that matters most is Battery Life (10 vs 8 in our scoring): hours.