OnePlus 15T vs Samsung Galaxy S24

OnePlus 15T

OnePlus

8.2

Compact battery champion

Samsung Galaxy S24

Samsung

8.2

The best small Android flagship

OnePlus 15T

What Reviewers Agree On

The 7,500 mAh silicon-carbon 'Glacier' battery is unprecedented in a 6.32-inch body and delivers roughly 1.5 days of real-world endurance — easily the longest battery life in the compact-flagship class.
Build quality is genuine flagship-grade: metal frame, IP66/IP68/IP69/IP69K dust + water resistance, ultrasonic in-display fingerprint sensor, and a 91% screen-to-body ratio with ~1.1 mm symmetric bezels.
The 6.32-inch 165 Hz 1.5K AMOLED reaches the advertised 1,800 nits in standard measurement and is marketed up to 3,600 nits peak — making it the only true 165 Hz compact-flagship display on the market.
Snapdragon 8 Elite Gen 5 + 16GB LPDDR5X Ultra Pro RAM hits Geekbench multi-core ~10,976 and 3DMark Wild Life Unlimited ~29,901 — top-tier flagship synthetic performance in a sub-200g chassis.
100W wired SuperVOOC and 50W wireless charging mean even the giant battery refills fast.

Pros & Cons

OnePlus 15T

Pros

The 7,500 mAh silicon-carbon 'Glacier' battery is unprecedented in a 6.32-inch body and delivers roughly 1.5 days of real-world endurance — easily the longest battery life in the compact-flagship class.
Build quality is genuine flagship-grade: metal frame, IP66/IP68/IP69/IP69K dust + water resistance, ultrasonic in-display fingerprint sensor, and a 91% screen-to-body ratio with ~1.1 mm symmetric bezels.
The 6.32-inch 165 Hz 1.5K AMOLED reaches the advertised 1,800 nits in standard measurement and is marketed up to 3,600 nits peak — making it the only true 165 Hz compact-flagship display on the market.
Snapdragon 8 Elite Gen 5 + 16GB LPDDR5X Ultra Pro RAM hits Geekbench multi-core ~10,976 and 3DMark Wild Life Unlimited ~29,901 — top-tier flagship synthetic performance in a sub-200g chassis.

Detailed Comparison

Design & Build

OnePlus 15T

OnePlus inherits the design language of the OnePlus 15 — metal frame, glass back, micro-arc oxidation finish on the rails — and shrinks it into a 6.32-inch, 194g body that's roughly iPhone 17-sized but with more than twice the battery capacity. IP66/IP68/IP69/IP69K rating, ultrasonic fingerprint sensor and ~1.1mm symmetric bezels are unambiguous flagship moves. Reviewers debate whether 6.32-inch genuinely counts as compact in 2026.

Same premium design as the OnePlus 15 — metal frame, glass back, IP69 water resistance — feels high-quality in the hand at just 194g.
Dimensions and weight are similar to an iPhone 17, but the 15T packs more than twice the battery capacity with a ~91% screen-to-body ratio.
Full-level water resistance and a fast ultrasonic fingerprint sensor make the 15T noticeably more confident outdoors than the OnePlus 13T was.
The metal frame uses a micro-arc oxidation process with a 50/50 weight distribution — it doesn't feel top-heavy and one-handed use is genuinely comfortable.

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Deal Breakers

China-only launch with no confirmed global release — ColorOS instead of OxygenOS, no eSIM support, no WearOS support, and missing European LTE band 20 and band 32 make it a compromise outside China.
Notebookcheck measured pronounced sustained-performance throttling of over 50% in 3DMark stress tests, with surface temperatures climbing past 46 °C; SuperSaf hit 50 °C on the back during Wildlife Extreme and saw scores drop from 6,990 to 3,743 inside a single loop.
No ultrawide camera at all — the 'triple camera' is just main + 16MP front + 3.5x periscope telephoto, which is a downgrade versus the OnePlus 15 for anyone who shoots landscapes, group photos or wide-angle video.
Charging port is still USB 2.0 in 2026, which SuperSaf calls 'a choice and not a good one' on a flagship-tier device at this price.
No built-in MagSafe-style magnets — wireless-charging accessories require a separate magnetic case to align properly.
Software-support window is uncertain: OnePlus has not committed to a specific update timeline for the Chinese-market 15T, and the global OnePlus 15 already commits to only 4 years of major Android upgrades — well behind Samsung and Google's 7-year promises.

Samsung Galaxy S24

What Reviewers Agree On

It is the best small/compact Android flagship — full flagship performance in a genuinely pocketable 6.2-inch body.
The flat 6.2-inch Dynamic AMOLED 2X at 120Hz with 2,600-nit peak is excellent and a big jump over the S23's 1,750 nits.
Battery life improved markedly over the S23 (17:46h video, ~9:46h browsing) despite a still-small 4,000mAh cell.
Snapdragon 8 Gen 3 for Galaxy delivers flagship performance and stays fast years later, with seven years of updates keeping it current.
It launched cheaper than the S23 ($799/128GB) and is an outstanding value on the used market in 2026 (~$400).

Deal Breakers

Charging is still capped at 25W wired with no UWB — unchanged from the S23 and slow by 2026 standards.
The camera is good but not class-leading; the telephoto and fine detail trail the best, and it's largely unchanged from the S23.
The Exynos 2400 variant runs hot, drains faster and has had 5G freezing and global-vs-US quality complaints.

Cons

China-only launch with no confirmed global release — ColorOS instead of OxygenOS, no eSIM support, no WearOS support, and missing European LTE band 20 and band 32 make it a compromise outside China.
Notebookcheck measured pronounced sustained-performance throttling of over 50% in 3DMark stress tests, with surface temperatures climbing past 46 °C; SuperSaf hit 50 °C on the back during Wildlife Extreme and saw scores drop from 6,990 to 3,743 inside a single loop.
No ultrawide camera at all — the 'triple camera' is just main + 16MP front + 3.5x periscope telephoto, which is a downgrade versus the OnePlus 15 for anyone who shoots landscapes, group photos or wide-angle video.
Charging port is still USB 2.0 in 2026, which SuperSaf calls 'a choice and not a good one' on a flagship-tier device at this price.
No built-in MagSafe-style magnets — wireless-charging accessories require a separate magnetic case to align properly.
Software-support window is uncertain: OnePlus has not committed to a specific update timeline for the Chinese-market 15T, and the global OnePlus 15 already commits to only 4 years of major Android upgrades — well behind Samsung and Google's 7-year promises.

Samsung Galaxy S24

Pros

It is the best small/compact Android flagship — full flagship performance in a genuinely pocketable 6.2-inch body.
The flat 6.2-inch Dynamic AMOLED 2X at 120Hz with 2,600-nit peak is excellent and a big jump over the S23's 1,750 nits.
Battery life improved markedly over the S23 (17:46h video, ~9:46h browsing) despite a still-small 4,000mAh cell.
Snapdragon 8 Gen 3 for Galaxy delivers flagship performance and stays fast years later, with seven years of updates keeping it current.
It launched cheaper than the S23 ($799/128GB) and is an outstanding value on the used market in 2026 (~$400).

Cons

Charging is still capped at 25W wired with no UWB — unchanged from the S23 and slow by 2026 standards.
The camera is good but not class-leading; the telephoto and fine detail trail the best, and it's largely unchanged from the S23.
The Exynos 2400 variant runs hot, drains faster and has had 5G freezing and global-vs-US quality complaints.

Display

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 S24

A 6.2-inch FHD+ Dynamic LTPO AMOLED 2X at 120Hz, jumping to a 2,600-nit peak (up from the S23's 1,750). Small but excellent.

6.2-inch Dynamic LTPO AMOLED 2X, 120Hz, HDR10+, 2,600 nits peak at 1080x2340 (416ppi) with always-on display.
Peak brightness is 2,600 nits, up from 1,750 on the S23 — a big real-world improvement.
It gets jaw-droppingly bright at 2,600 nits max, excellent for outdoor use.
Coming from a Pixel 6, the S24's screen is a dramatic upgrade and the speaker is far louder.

Battery & Charging

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 S24

A 4,000mAh cell (up from the S23's 3,900) with markedly better endurance — but charging is still capped at an unchanged 25W.

Battery grew from 3,900mAh to 4,000mAh; video playback hit 17:46h (~4h more than the S23 and beating the Pixel 8), browsing 9:46h, gaming 7:34h.
Charging remains 25W wired / 15W wireless / 4.5W reverse with no UWB — unchanged from the S23.
In a multi-phone endurance test the Snapdragon S24 outlasted a Pixel 8 that has a 22%-bigger battery — Tensor G3 is clearly less efficient than the Exynos 2400.
After a year of charging, gaming and streaming the battery still measured 100% health at 302 cycles (Samsung's hidden diagnostics).
The Exynos S24 ran hotter (43°C even on Wi-Fi) and was the first to die in the multi-phone drain test.