OnePlus 15T vs Samsung Galaxy S25 Ultra

OnePlus 15T

The 6.32-inch 165 Hz 1.5K AMOLED panel is the only true 165 Hz compact-flagship display on the market and pairs that refresh rate with a measured 1,800 nits brightness, 460 ppi pixel density, Crystal Shield Glass, and HDR10+/Dolby Vision support. Native 165 Hz support in popular FPS games is a real differentiator. Notebookcheck flags 120.7 Hz PWM dimming that can cause eyestrain for sensitive users.

• The 6.32-inch 165 Hz AMOLED panel achieves a very good 460 ppi pixel density and the advertised maximum brightness of 1,800 nits in standard measurement.
• Display sharpness is plenty competent — sharp, smooth, and easily one of the strongest spec sheets you can get on a compact phone.
• Native 165 Hz support in COD, Delta Force and Peacekeeper Elite makes this the only small-screen flagship pushing a full 165 Hz gaming experience.
• OnePlus claims up to 3,600 nits peak brightness — even on a playground in direct sunlight you can still see everything clearly, no squinting required.
• Specifications confirm a 6.32-inch 1.5K (1216 × 2640) resolution with 165 Hz refresh — a configuration unique to the 15T in the compact class.
• Display backlight flickers at just 120.7 Hz under PWM dimming — low enough that the flickering may cause eyestrain and headaches for sensitive users after extended use.

Samsung Galaxy S25 Ultra

Virtually every reviewer calls the S25 Ultra display the best on a smartphone, thanks to the Gorilla Armor 2 anti-reflective coating that practically eliminates glare in sunlight, the 2,600-nit peak brightness, and the sharp 1440p LTPO panel. A few reviewers note PWM dimming only reaches 480 Hz and peak auto-brightness doesn't always sustain.

• The anti-reflective coating makes it one of the easiest phones to use in direct sunlight and held up well to scratches over a week of abuse.
• The Gorilla Armor 2 panel strikes an almost perfect balance between glossy and matte, with 2,600-nit peak brightness that dazzles in any environment.
• The S25 Ultra's anti-reflective screen eclipses every other smartphone right now, especially under harsh sunlight.
• After six months of use it is simply put: the best display I've ever seen on mobile — the bezels, brightness and colors are unbeatable.
• The low-glare, bright LTPO display is a strength, but PWM dimming is only at 480 Hz which can bother sensitive eyes.

OnePlus 15T

Snapdragon 8 Elite Gen 5 paired with 12-16GB LPDDR5X Ultra Pro RAM delivers flagship synthetic scores — Notebookcheck recorded Geekbench multi-core 10,976 and 3DMark Wild Life Unlimited 29,901, on par with the larger Xiaomi 17 and Honor Magic8 Pro Air. The problem is sustained: in the 3DMark Wild Life stress test the GPU drops over 50% and the back of the phone hits 50 °C, which both Notebookcheck and SuperSaf flag as a deal-breaker for long gaming sessions.

• Geekbench 6 multi-core hits 10,976 — flagship-tier and within 1% of the average 8 Elite Gen 5 result, so there is no compromise on the chipset versus larger phones.
• 3DMark Wild Life Unlimited hits 29,901 — 5% above the 8 Elite Gen 5 average and ahead of the Xiaomi 17 with the same chip.
• In the 3DMark stress tests the OnePlus 15T shows a sharp drop in performance of over 50%, which significantly lowers our rating.
• Wildlife Extreme stress test scores swung from 6,990 best loop to 3,743 worst loop in a single run — the chart is 'quite a bit of a bumpy ride' and performance mode did nothing to stabilize it.
• Surface temperatures hit 48.3 °C on the back during stress testing and continued climbing to 50 °C near the camera bump — about 45 °C internal — which seems to be the phone's thermal limit.
• Genshin Impact averaged 60.3 fps over 30 minutes at just 3.2 W power draw, with the phone staying cool to the touch — and Peacekeeper Elite pushed 164.5 fps thanks to native 165 Hz support.
• r/Android's reviewer thread flags the same thermal issue directly: 'Gets kinda hot, over 50 degrees in the corner. This is with its very heavy throttling.'

Samsung Galaxy S25 Ultra

The Snapdragon 8 Elite for Galaxy delivers a meaningful generational jump in both CPU and GPU, rivaling Apple's A18 Pro and outscoring the iPhone 16 Pro Max in multi-core. The 40 percent larger vapor chamber keeps the phone cool even under sustained gaming loads. The r/apple thread citing a 36% GPU lead over the iPhone 16 Pro Max generated heated discussion, with most commenters conceding the Snapdragon chip is genuinely fast even if they still wouldn't switch.

• The phone benchmarks crazy high, rivaling Apple's A18 Pro — a little lower in single core but higher in multi-core.
• Samsung's 40 percent larger vapor chamber keeps the phone from warming up in normal use and benchmarks are up 30-40 percent depending on the task.
• Playing Genshin Impact at max settings for nearly an hour produced no stutters and no hot spots — a noticeable improvement over the S24 series.
• Multi-core Geekbench hits 9,793 versus the iPhone 16 Pro Max at 8,772 — the S25 Ultra pulls ahead thanks to extra cores and 12GB of RAM.
• The Snapdragon 8 Elite is the most welcome generational upgrade this year, with a boosted 'for Galaxy' variant delivering more CPU headroom than the standard chip.

OnePlus 15T

OnePlus has dropped the Hasselblad partnership (now Oppo-exclusive) and built the 15T camera around two 50MP sensors — a main with a 1/1.56-inch Sony IMX906 and OIS, plus a new 3.5x periscope telephoto with OIS at the classic 85mm portrait focal length. There is no ultrawide. Notebookcheck still rates the system 'a class above' the iPhone 17, but reviewers agree this is the area where the 15T's compact-and-cheap positioning is most visible — sensor sizes are small, sharpness and dynamic range trail genuine top-tier flagships, and the OnePlus 15 / Oppo Find X9 Pro siblings keep the better imaging.

• The new 3.5x periscope telephoto delivers a classic 85 mm focal length perfect for portraits — a huge step forward from the OnePlus 13T's limited 2x zoom.
• OnePlus has confirmed the headline upgrade is a LUMO periscope telephoto with both improved hardware and improved algorithms, focused on stronger zoom and better atmospheric portraits.
• Despite the small 1/1.56-inch main sensor, the 15T's daylight and low-light photos are 'still a class above' the iPhone 17 in side-by-side comparison.
• The 50MP main sensor lacks sharpness and dynamics — good photos are possible in both daylight and dark, but top quality looks different.
• There is no ultra-wide-angle camera at all — the omission is partly excused by the new periscope, but it's a meaningful downgrade versus the OnePlus 15's triple-camera system.
• The telephoto produces unstable results inconsistent with the main sensor — at night the camera struggles with depth perception and doesn't always switch to the periscope when it should.
• The cooperation with Hasselblad is now Oppo-exclusive, and the OnePlus 15T's built-in image sensors are quite small and therefore not very bright.
• The selfie camera drops from 32MP on the OnePlus 15 to 16MP on the 15T — a small but real downgrade for anyone who shoots a lot of front-facing video.

Samsung Galaxy S25 Ultra

The only new hardware is a 50MP ultrawide with an f/1.9 aperture and autofocus — the 200MP main, 10MP 3x and 50MP 5x telephoto lenses all carry over from the S24 Ultra. Reviewers agree the ultrawide is a genuine improvement and low-light video processing is noticeably cleaner, but colors still skew saturated and shutter lag persists — a complaint echoed on Reddit by would-be switchers. Samsung's imaging is now slightly behind the Vivo X200 Pro and Xiaomi 15 Ultra but remains top-tier.

• The new 50MP ultrawide delivers more fine detail than the S24 Ultra's sensor, and the wider f/1.9 aperture helps keep noise low.
• Some low-light ultrawide shots are sharper than both the Google Pixel 9 Pro and iPhone 16 Pro Max, but the rest of the cameras feel static.
• Samsung's penchant for slightly overboard sharpening is still visible, though the new ultrawide beats what the Pixel 9 Pro can do.
• Photos straight from the camera are a little too natural-looking, and most shots need editing to look their best.

OnePlus 15T

This is the section the OnePlus 15T was built to win. The 7,500 mAh silicon-carbon 'Glacier' cell is the largest ever fitted to a true compact phone — 50% bigger than the iPhone 17's pack in a similar footprint. Notebookcheck measured roughly 1.5 days of real-world endurance at 150 cd/m². Wired charging tops out at 100 W, wireless at 50 W. The only friction points are the missing built-in magnets for MagSafe-style alignment and the still-USB-2.0 port.

• OnePlus relies on a silicon-carbon-based battery with a large capacity of 7,500 mAh for its mini flagship — in our practical battery test at 150 cd/m² brightness, the 15T achieved an excellent battery life of nearly 1.5 days.
• 9to5Google's preview confirms the 7,500 mAh cell carries the same 'Glacier' moniker as the OnePlus 15's battery, so the silicon-carbon structure is here too — 200 mAh more than the larger sibling.
• Even though the phone keeps the same compact size, it now packs a massive 7,500 mAh battery — to put that into perspective, the iPhone 17 Pro Max only has around 5,000 mAh, and this is a 6.32-inch phone.
• Battery life is wild for a phone this size and is actually a hair bigger than the one in the OnePlus 15, which has a noticeably larger footprint.
• 100W SuperVOOC wired charging and 50W wireless mean even the huge cell refills fast — getting through two full days on a single charge feels totally realistic.
• There is no native magnetic Qi alignment — wireless charging works, but accessories require a separate magnetic case for MagSafe-style snap-on functionality.
• r/Android's reaction to the battery is unambiguous — 'Incredible battery life makes the compact smartphone competition pale in comparison' is the actual review-thread headline.

Samsung Galaxy S25 Ultra

The 5,000 mAh battery is unchanged but the more efficient chip pushes real-world endurance comfortably beyond a day — Engadget measured 29h 27m video runtime, Mrwhosetheboss got nearly 9 hours of screen-on time. Wired charging tops out at 45W, wireless at 25W. The Qi2 Ready implementation without built-in magnets is a consistent frustration, and Reddit users openly say the OnePlus 13's silicon-carbon battery was the more exciting release this year.

• Most days end with 60 percent left over — good but not amazing for a modern flagship.
• Local video rundown lasted an incredible 29 hours 27 minutes — almost two hours longer than the S24 Ultra.
• Battery life is just under 9 hours of total screen-on time per charge, regularly ending days with 30-40 percent remaining.
• Standby time after half a year of use remains excellent — never a single battery issue during long-term testing.
• Qi2 Ready is frustrating — you need a third-party magnetic case for MagSafe-like functionality, and some cases have weak magnets that pop off.

OnePlus 15T

The OnePlus 15T ships with ColorOS 16 on Android 16 in China rather than the global OxygenOS, though the two skins are now nearly identical in feel. Update commitments are unclear — OnePlus doesn't publish a timeline for Chinese-market hardware, and even the global OnePlus 15 only commits to 4 years of major Android upgrades. Mind Space (AI-powered productivity vault) and Gemini integration are the headline software features.

• ColorOS 16 comes pre-installed on the 15T instead of OxygenOS — but the differences are minor overall, with German language and Android Auto supported, though no WearOS watches or eSIMs.
• There are question marks over the duration of the updates provided — the manufacturer does not usually provide any information on this for China, though typically a OnePlus 15-class phone should receive security updates for six years.
• OxygenOS 16 (and ColorOS 16 by extension) integrates Gemini with Mind Space — you can ask Gemini about any saved memory and it accesses local content to perform tasks, making it the best on-phone AI integration we have seen.
• Mind Space is the headline AI feature — a digital vault that takes a screenshot of important content and saves it as a card with URL, summary, title and hashtags for contextual search.
• The system feels incredibly smooth — arguably one of the best experiences you can get on Android right now, with useful features for students like meeting summaries and lecture transcription.
• Update commitment trails the competition — even on the global OnePlus 15 the company only promises 4 years of major Android upgrades, well behind Samsung and Google's 7-year commitments.

Samsung Galaxy S25 Ultra

One UI 7 on Android 15 is Samsung's biggest skin update in years and earns broad praise for polish. Gemini replaces Bixby as the default assistant on long-press and gains cross-app actions, though the experience is uneven — some reviewers report magical moments, others catch hallucinations. Samsung has committed to seven years of updates, and Galaxy AI is free only through the end of 2025. The r/gadgets thread is openly hostile toward the AI pitch — most top comments view it as bloat, tracking, or a distraction from real hardware progress.

• Gemini can put events on the calendar, but it also hallucinates recipes and insists flights leave the wrong city — AI makes things up a lot.
• Galaxy AI features will be free only through the end of 2025, so don't be surprised if the AI phone comes with an AI subscription fee.
• Having two assistants (Gemini and Bixby) is confusing, and Now Brief still hasn't produced anything insightful in two weeks of use.
• Improved natural-language commands throughout the phone feel slightly magical — asking the phone to add the next Knicks game to a calendar just works.

OnePlus 15T

Strictly on price-to-spec the 15T is excellent — ¥4,300 (~$620 imported) for a Snapdragon 8 Elite Gen 5, 7,500 mAh battery and 165 Hz panel is hard to match. The catch is whether you should buy the 15T over the standard OnePlus 15 (which costs about the same money but adds an ultrawide camera, a 32MP selfie camera, and is actually available in the US). Reviewers split: SuperSaf says the math 'gets uncomfortable,' while Notebookcheck and TechMickey think the compact form factor is worth the camera compromises.

• For less than €600 the overall package is really good for the compact class — an interesting alternative to a Galaxy S26 or Pixel 10 Pro.
• When you put this next to the OnePlus 15, the math gets a little uncomfortable — you pay similar money for a smaller screen, one fewer camera sensor, a downgraded selfie camera, and a USB 2.0 port that hasn't been upgraded.
• Keeping a USB 2.0-level port on a flagship-tier device at this price in 2026 is a choice and not a good one.
• The base variant starts at 4,299 yuan in China — roughly £469 in the UK and $621 in the US — which makes it highly competitive in the compact segment despite rising industry storage costs.
• If the LUMO periscope delivers as promised and the battery and cooling upgrades don't add bulk, the OnePlus 15T could be shaping up as one of the more interesting compact flagships of the year.
• r/gadgets is openly excited about the pricing — 'finally a flagship that doesn't need a second mortgage' is one of the higher-voted reactions on the official first-look thread.

Samsung Galaxy S25 Ultra

At $1,299 the S25 Ultra is one of the priciest non-folding phones on the market, and reviewers repeatedly ask whether the incremental hardware improvements justify the premium. The OnePlus 13 ($400 less) and iPhone 16 Pro Max ($100 less) are the two most common recommended alternatives, though the Ultra's complete package — stylus, 5x tele, anti-reflective screen, seven years of updates — still wins over buyers who want it all in one device. User sentiment across r/Android and r/gadgets skews cooler: the dominant view is that the Ultra 'no longer feels Ultra' and that rivals offer better value in 2025.

• At $1,299 it is one of the most expensive non-folding phones, and it's fair to ask for more than a spec bump for that money.
• The iPhone 16 Pro is $300 less and also has a titanium frame — it's hard to justify the $1,300 asking price.
• A OnePlus 13 has a brighter display, IP69, better battery life, faster charging and a $400 lower price tag.
• This is still one of the most complete packages on Android and maybe the best outright phone you can buy, especially on discount.