Outstanding value — reviewers repeatedly call it a 'flagship killer' and 'the best value in an Android flagship', undercutting Samsung and Google substantially.
Battery life is a defining strength — the big 5,400mAh cell delivers 6–10 hours of screen-on time and is the single feature owners praise most, even those who switched away.
Charging is exceptional — 80W (US) / 100W (international) wired fully charges in roughly 30 minutes (owners report ~40 min real-world), plus 50W wireless.
The 6.82-inch LTPO AMOLED is among the best phone displays — 120Hz, Dolby Vision, and a 4,500-nit peak that stays readable in harsh sunlight.
Snapdragon 8 Gen 3 with up to 16/24GB RAM delivers top-tier performance that still feels fast a year-plus later.
Deal Breakers
Pros & Cons
OnePlus 12
Pros
Outstanding value — reviewers repeatedly call it a 'flagship killer' and 'the best value in an Android flagship', undercutting Samsung and Google substantially.
Battery life is a defining strength — the big 5,400mAh cell delivers 6–10 hours of screen-on time and is the single feature owners praise most, even those who switched away.
Charging is exceptional — 80W (US) / 100W (international) wired fully charges in roughly 30 minutes (owners report ~40 min real-world), plus 50W wireless.
The 6.82-inch LTPO AMOLED is among the best phone displays — 120Hz, Dolby Vision, and a 4,500-nit peak that stays readable in harsh sunlight.
Detailed Comparison
Design & Build
OnePlus 12
Premium curved glass-sandwich build with a polarising circular Hasselblad camera island. Reviewers and owners love the in-hand feel; the camera bump and curved edges divide opinion.
The OnePlus 12 feels great in hand right out of the box — curved front and rear glass and a smooth matte rear panel make it comfortable to hold without flat edges digging in.
The familiar circular rear camera housing on a glass-sandwich design stands out with character and contributes significantly to the phone's premium appeal.
The camera module is strikingly bulky and carries a Hasselblad watermark unless you opt to remove it.
Reddit reaction to the design is split — 'the ugliest camera layout in the game' versus owners who find the Flowy Emerald finish gorgeous.
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OxygenOS has regressed and software-update longevity lags Samsung/Google — a recurring concern that makes some buyers hesitate.
The curved screen frustrates ergonomically and makes finding a good screen protector a genuine, repeated headache.
US connectivity is compromised — no Forced SA/VoNR support and occasional Wi-Fi-to-mobile-data handoff bugs.
The camera island is strikingly bulky and the periscope struggles in low light versus the main sensor.
Xiaomi 17 Ultra
What Reviewers Agree On
Class-leading camera hardware: a 1.0"-type LOFIC main sensor and a true continuous mechanical optical zoom (75–100mm) that GSMArena rates as quite probably the best of its kind
Among the very best phones for photography on the market today, possibly the single best for stills
Snapdragon 8 Elite Gen 5 delivers flagship-class performance — ~20% faster CPU and ~23% faster GPU than the previous generation, leading the iPhone in multi-core
Bright 6.9-inch 120Hz LTPO AMOLED rated at 3,500 nits peak with strong measured outdoor brightness
Distinctive physical camera controls (zoom ring on the Leica edition, Leica film simulations) that no mainstream rival offers
6 years of security patches confirmed (EOL February 2032)
Deal Breakers
HyperOS is widely seen as lagging the hardware — camera-app limitations, automatic JPEG post-processing criticised as poor, and a Phone Arena verdict that it's 'the best camera phone you'll hate using every day'
The global model runs noticeably hotter and shorter on battery than the China version, draining ~10% per hour in mixed use and losing more battery and running hotter than the OnePlus 15 and Oppo Find X9 Pro in head-to-head endurance
Very expensive globally — about $1,750 for the 17 Ultra and ~$2,300 for the Leitzphone — narrowing its value versus the previous generation
Polarising design and a usability tax: it's a camera-first device that some reviewers and users find feels more like a toy than a polished daily phone
Snapdragon 8 Gen 3 with up to 16/24GB RAM delivers top-tier performance that still feels fast a year-plus later.
Cons
OxygenOS has regressed and software-update longevity lags Samsung/Google — a recurring concern that makes some buyers hesitate.
The curved screen frustrates ergonomically and makes finding a good screen protector a genuine, repeated headache.
US connectivity is compromised — no Forced SA/VoNR support and occasional Wi-Fi-to-mobile-data handoff bugs.
The camera island is strikingly bulky and the periscope struggles in low light versus the main sensor.
Xiaomi 17 Ultra
Pros
Class-leading camera hardware: a 1.0"-type LOFIC main sensor and a true continuous mechanical optical zoom (75–100mm) that GSMArena rates as quite probably the best of its kind
Among the very best phones for photography on the market today, possibly the single best for stills
Snapdragon 8 Elite Gen 5 delivers flagship-class performance — ~20% faster CPU and ~23% faster GPU than the previous generation, leading the iPhone in multi-core
Bright 6.9-inch 120Hz LTPO AMOLED rated at 3,500 nits peak with strong measured outdoor brightness
Distinctive physical camera controls (zoom ring on the Leica edition, Leica film simulations) that no mainstream rival offers
6 years of security patches confirmed (EOL February 2032)
Cons
HyperOS is widely seen as lagging the hardware — camera-app limitations, automatic JPEG post-processing criticised as poor, and a Phone Arena verdict that it's 'the best camera phone you'll hate using every day'
The global model runs noticeably hotter and shorter on battery than the China version, draining ~10% per hour in mixed use and losing more battery and running hotter than the OnePlus 15 and Oppo Find X9 Pro in head-to-head endurance
Very expensive globally — about $1,750 for the 17 Ultra and ~$2,300 for the Leitzphone — narrowing its value versus the previous generation
Polarising design and a usability tax: it's a camera-first device that some reviewers and users find feels more like a toy than a polished daily phone
Versus the S24+, owners note the Samsung is cleaner, thinner and lighter — the OnePlus is the chunkier of the two.
Xiaomi 17 Ultra
A camera-first design dominated by a huge circular Leica island, slim for what it packs, with a polarising aesthetic and a Leica edition that adds a knurled grip and rotating zoom ring.
Xiaomi has stuffed an enormous amount into the slim 8.5mm frame, and the massive rear camera island outclasses most competitors on hardware alone.
The Xiaomi is 8.29mm thick and 219g — slightly thinner and lighter than the iPhone 17 Pro Max — though the iPhone still feels more premium in hand.
The Leica Edition stands out with classic dual-tone styling, textured leather, matte metal and a gold knurled frame detail that looks premium and improves grip.
Compared to the S26 Ultra the Xiaomi 17 Ultra's design is divisive — one reviewer outright disliked it next to Samsung's more distinct visual identity.
IP68-rated body for dust and water resistance, with a centred circular camera island carrying Leica branding.
Display
OnePlus 12
A 6.82-inch LTPO AMOLED with 120Hz, Dolby Vision, 2160Hz PWM dimming and a 4,500-nit peak — widely rated one of the best phone panels available, with the only knock being curved-edge ergonomics.
These are some of the best OLED panels you can get on a smartphone right now — and it gets brighter than the iPhone 15 Pro at 4K HDR YouTube playback.
HBM mode delivers excellent outdoor visibility even under harsh sunlight, and the QHD panel is noticeably sharper than a 1080p screen.
Notebookcheck rates the display the standout — scoring it 114% in their weighted display metric.
The curved edges add a premium flair with good palm rejection, but finding screen protectors is a real headache — most UV guards bubble within a month.
Xiaomi 17 Ultra
A 6.9-inch 1.5K LTPO AMOLED rated at 3,500 nits peak. Measured brightness is strong on small patches but middling full-screen, and one long-term user was pleasantly surprised by it.
6.9-inch M10 OLED LTPO flat display at 1.5K resolution, 120Hz, with up to 3,500 nits peak brightness, HDR10 and Dolby Vision.
In automatic brightness the screen measured over 1,100 nits, rising to over 3,600 nits on a small patch of the screen.
Manual full-screen white brightness reached only 675 nits in controlled testing — well below the headline peak figure.
The display surprised one long-term user in a positive way — not at the level of the Pixel 10 Pro's panel, but still rather good.
Cameras
OnePlus 12
A Hasselblad-tuned triple system — 50MP main, 64MP 3x periscope, 48MP ultrawide — that delivers a genuine flagship experience and the best OnePlus camera yet, though it still trails Pixel/Galaxy for stills and the periscope weakens in low light.
Triple rear: 50MP f/1.6 main with OIS, 64MP f/2.6 3x periscope telephoto with OIS, and 48MP ultrawide — plus 8K/24fps video.
The OnePlus 12 delivers on its camera promise — impressive detail and reliable zoom, easily one of the best camera efforts from OnePlus.
The 3x periscope is a daily-driver favorite — used 90% of the time — and 3x portrait mode is the standout, though it produces warmer tones and struggles in low light versus the main sensor.
In a three-way test against the Pixel 8 Pro and S24 Ultra, owners were 'honestly surprised at how good the cameras of the 12 are' — but the Pixel still took the best, most true-to-life pictures.
Versus the S24, owners say Samsung's cameras are definitely better in most comparison shots, though the OP12 occasionally looks better.
Xiaomi 17 Ultra
The reason this phone exists. A 1-inch LOFIC main sensor and an industry-first continuous mechanical optical zoom put it at or near the top of the smartphone camera rankings — but JPEG processing and a steep learning curve divide opinion.
The 17 Ultra keeps a 1.0"-type main sensor while most makers go smaller; its main camera is quite probably the best of its kind and the phone is among the best for taking pictures currently on the market, possibly the best.
It combines two technologies not seen together in mobile before — a 1-inch LOFIC sensor in the main camera and a mechanical periscope with continuous optical zoom — reducing ghosting and capturing highlights and shadows in a single exposure.
Camera kit details: 23mm 50MP 1-inch main at fixed f/1.67, a 200MP 75–100mm true mechanical optical zoom (not a digital crop), and a 14mm 50MP f/2.2 ultrawide.
This is one of the best camera systems ever used on a smartphone, as was the 15 Ultra.
The sensor is excellent, but Xiaomi's automatic JPEG post-processing is an absolute disaster, and distant faces can look like paint blobs.
Performance
OnePlus 12
Snapdragon 8 Gen 3 with up to 16/24GB RAM makes it 'uber-powerful' — top-tier speed that holds up well over time, with only thermal-throttled gaming as a caveat.
Powered by the high-end Snapdragon 8 Gen 3 with up to 16GB of RAM — 'uber-powerful' and one of the best phones money can buy.
Snapdragon 8 Gen 3 with 12GB LPDDR5X and UFS 4.0 keeps the phone feeling as fast in 2025 as it did on day one.
Notebookcheck scores performance 86% — strong, with the OnePlus 12 carrying the Snapdragon 8 Gen 3 (the 12R uses the older Gen 2).
Gaming is smooth and lag-free, but the phone restricts frame rates to 60fps once temperatures hit 40°C.
Xiaomi 17 Ultra
Snapdragon 8 Elite Gen 5 keeps it firmly in the flagship tier with strong gaming, though sustained behaviour and thermals draw mixed verdicts.
The Snapdragon 8 Elite Gen 5 brings ~20% faster CPU, ~23% faster GPU and peak speeds up to 4.61GHz over the previous generation.
The iPhone has a slight single-core edge but the Xiaomi takes the lead in Geekbench multi-core.
Genshin Impact at very high settings ran 30 minutes at an average of 55.3fps with a 1% frame drop, while lighter titles like Honor of Kings averaged 107.8fps; both front and back stayed around 40°C.
It delivered significantly better gaming performance than the Xiaomi 17 Pro and performed better in the stress test than the 17 Pro with the same 16GB of RAM.
Delta Force ran for 23 minutes straight with impressive thermal management and no notable heating.
Running AnTuTu pushed the phone to 47.5°C — hotter than rival devices measured at 40–42°C.
Xiaomi makes some of the best fingerprint sensors in the game, and the ultrasonic sensor works well even with tempered glass.
Battery & Charging
OnePlus 12
The 5,400mAh battery is the phone's most-praised feature — multi-day-feeling endurance with 6–10 hours of screen-on time — paired with class-leading 80W (US) / 100W wired and 50W wireless charging.
The huge 5,400mAh battery is one of the key reasons the OnePlus 12 excels in long-term use, consistently delivering 6–7 hours of screen-on time at a constant 120Hz.
It easily lasts 9 to 10 hours of screen time on moderate use; at 6 months, 7–8 hours with all features on.
Charging spec: 100W wired 100% in 26 min (international) / 80W in 30 min (USA), plus 50W wireless to full in 55 min.
Real-world the battery fully charges from ~5% to 100% in about 40 minutes (occasionally up to 50) — and OnePlus includes the 100W SuperVOOC adapter in the box.
Even owners who sold the phone agree the one thing it did better than any other phone they've used is the battery.
Xiaomi 17 Ultra
The single biggest divide in the coverage: lab tests record an excellent active-use score, but the global model's smaller battery, ~10%/hour real-world drain and heat make endurance inconsistent. Charging stepped down to 90W wired / 50W wireless.
The global 17 Ultra earned an excellent active-use battery score of over 19 hours, charging 0–70% in half an hour and to full in just 43 minutes.
After 3 months a user still had around 45% battery left at the end of the day when not using the camera intensively.
For a 6,000mAh battery, ~4 hours of screen-on time over a full day was disappointing — the S26 Ultra's 5,000mAh cell matched or beat it under the same camera-and-navigation use.
In a head-to-head extreme test the 17 Ultra ran hotter and lost more battery than the OnePlus 15 and Oppo Find X9 Pro at nearly every stage, finishing about 8 hours 8 minutes at 43.7°C.
The global model holds ~800mAh less than the China version and drains roughly 10% per hour, so it can't last a full 15-hour day the way the China version does.
Value vs Competition
OnePlus 12
The OnePlus 12's core argument: flagship hardware that materially undercuts the Galaxy S24 and Pixel, with frequent discounts to ~$650 making the value case even stronger.
9to5Google's headline verdict: 'OnePlus 12 Review: The best value in a smartphone in 2024'.
Forbes / Moor Insights framed it bluntly: 'Samsung beware — OnePlus debuts a flagship killer with the OnePlus 12'.
It is significantly lower priced than comparable mainstream flagships — about 57% cheaper than an equivalent S24+ in one owner's market — squarely back in flagship-killer territory.
Reddit consensus: being significantly less expensive than the S24 Ultra makes it the top choice for most people; r/Android dubbed it 'The Best Premium Phone of 2024 (in the USA)'.
It frequently drops to ~$650 — a record low — making an already strong value proposition even better.
Still hits a sweet spot in 2025 — flagship-level features without the ultra-premium price, 'one of the best beast devices from OnePlus'.
Xiaomi 17 Ultra
A premium price for a premium camera. Reviewers agree the hardware is exceptional but increasingly question whether the global price and software make it the right buy versus the cheaper Xiaomi 17 or rivals.
The 17 Ultra starts from £1,299 / €1,499 (about $1,750) globally, with the limited Leitzphone at £1,699 / €1,999 ($2,300) — right up there with high-end Pixel and Galaxy models.
The 17 Ultra is getting all the attention as a camera-focused device with best-of-the-best specs, but most buyers are likely considering something closer in price to the standard Xiaomi 17.
The Xiaomi 17 Ultra's value proposition has weakened compared to the previous generation, though at a discounted price it suddenly becomes excellent value.
Tech Advisor argues the standard Xiaomi 17 actually comes out ahead for most people — bigger 6,330mAh battery, 35+ hours video playback and faster 100W charging.
The bigger 1-inch sensor lets you get significantly closer with nicer background blur, and raw long exposures on a tripod are a real strength the iPhone can't match.
One long-term user found the cameras utterly underwhelming and sometimes downright horrible in video — Xiaomi really needs to fix the processing.
In a direct comparison, the Oppo Find X9 Ultra remained the best camera phone tested — the 17 Ultra didn't stand out as particularly better in any single way, though there's lots to love.
Telephoto closest focusing distance is around 30cm — worse than the Xiaomi 15 Ultra and roughly in line with competitors — and the Ultra showed the weakest resolution among the group when pushed to ~170mm.
JerryRigEverything's battery test had the 17 Ultra last 19.25 hours versus the iPhone 17 Pro Max's 26.5 hours.
Charging stepped down this generation — 90W wired (full charge ~62 minutes) and 50W wireless, down from 80W wireless previously.
It's one of the best phone batteries used on a flagship in recent memory according to a dedicated battery review.
It's hard to fully recommend the 17 Ultra to a regular consumer unless that person knows photography and how to switch the camera settings to make it work.
Still, in a vacuum it's an excellent premium flagship with one of the best camera systems around — definitely one of the best phones tested in 2026 so far.
