OnePlus 15T vs Samsung Galaxy S23+

OnePlus 15T

OnePlus

8.2

Compact battery champion

Samsung Galaxy S23+

Samsung

8.3

Best-value Galaxy S23 — same chip + 45W as Ultra, no S Pen

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

Performance

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.

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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 S23+

What Reviewers Agree On

Same bespoke Snapdragon 8 Gen 2 for Galaxy (3.36GHz) chip as the S23 Ultra — flagship performance, more efficient than the Exynos S22+
Same 45W wired + 15W wireless charging as the Ultra (only the standard S23 is stuck at 25W)
6.6-inch FHD+ Dynamic AMOLED 2X with 120Hz and 1750-nit peak — beautifully bright in sunlight
Excellent endurance from a 4,700mAh battery and the efficient chip — GSMArena measured ~14h Active Use score and 111h endurance, owners report 12h+ days with 40% left
IP68 + Gorilla Glass Victus 2 + Armor Aluminum frame, redesigned floating-camera look borrowed from the Ultra
4 OS updates / 5 years of security — among the best support in Android

Deal Breakers

'Awkward middle child' — doesn't stand out vs the Ultra (which adds S Pen, 10x periscope, 200MP camera, QHD+) or vs the cheaper standard S23
No S Pen and no periscope telephoto — the two features most reviewers cite as the Ultra's real edge
Only FHD+ display resolution (not QHD+ like the Ultra) — sharp enough but not class-leading
Box cable doesn't trigger 45W charging — must buy a separate 5A PPS cable to hit rated speeds
$999 launch price feels steep next to the OnePlus 11 (80W charging at lower price) and Pixel 7 Pro

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 S23+

Pros

Same bespoke Snapdragon 8 Gen 2 for Galaxy (3.36GHz) chip as the S23 Ultra — flagship performance, more efficient than the Exynos S22+
Same 45W wired + 15W wireless charging as the Ultra (only the standard S23 is stuck at 25W)
6.6-inch FHD+ Dynamic AMOLED 2X with 120Hz and 1750-nit peak — beautifully bright in sunlight
Excellent endurance from a 4,700mAh battery and the efficient chip — GSMArena measured ~14h Active Use score and 111h endurance, owners report 12h+ days with 40% left
IP68 + Gorilla Glass Victus 2 + Armor Aluminum frame, redesigned floating-camera look borrowed from the Ultra
4 OS updates / 5 years of security — among the best support in Android

Cons

'Awkward middle child' — doesn't stand out vs the Ultra (which adds S Pen, 10x periscope, 200MP camera, QHD+) or vs the cheaper standard S23
No S Pen and no periscope telephoto — the two features most reviewers cite as the Ultra's real edge
Only FHD+ display resolution (not QHD+ like the Ultra) — sharp enough but not class-leading
Box cable doesn't trigger 45W charging — must buy a separate 5A PPS cable to hit rated speeds
$999 launch price feels steep next to the OnePlus 11 (80W charging at lower price) and Pixel 7 Pro

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 S23+

4,700mAh paired with the efficient chip delivers excellent real-world endurance — owners regularly hit 5-8 hours SOT and full days with 40% to spare. Charging is 45W rated (the standard S23 is only 25W) but caps out at ~1h6m to full and needs the correct PPS cable.

4,700mAh battery (up 200mAh from S22+) and 8 Gen 2 for Galaxy give a measured 14h Active Use score and a 111h GSMArena endurance rating — beating the S22+'s 97h.
Real-world: 5-8 hours of SOT typical, with one owner reporting 12 hours of mixed use (YouTube, gaming, Bluetooth, texting) and still 40% left.
After 2.5 years, moderate use still gets 2 days of battery — long-term efficiency holds up well.
45W wired charging: 21% in 10 min, 39% in 20 min, 55% in 30 min, 79% in 45 min, full in ~1h9m.
ChargerLAB confirmed: peak charging is ~40W (drops to 33W after 6 min); a PPS-capable charger is needed — without it the rate caps at 27W.