OnePlus 15T vs Samsung Galaxy S23

OnePlus 15T

OnePlus

8.2

Compact battery champion

Samsung Galaxy S23

Samsung

Best compact Android flagship of 2023

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

Genuinely compact flagship — 6.1" body 'frees you from awkward big phones and camera spec overkill' (Android Central)
Same Snapdragon 8 Gen 2 for Galaxy chip as the Plus and Ultra — no performance compromise vs the more expensive siblings
Same 50MP main + 12MP ultrawide + 10MP 3x telephoto + 12MP selfie as the Plus — the 3x optical zoom is a real step up from rivals stuck at 2x
Display brightness up 35% from the S22 to 1750-nit peak; 120Hz Dynamic AMOLED 2X stays sharp and vibrant
Adopts the Ultra's floating-camera design — cohesive trio look without the contour bump
4 OS upgrades + 5 years of security — covers it through Android 17 and into 2027/2028

Deal Breakers

Only 25W wired charging — the Plus and Ultra get 45W, OnePlus 11 gets 80W; 0-100% takes ~1h12m even on the right charger
Just 3,900mAh battery — adequate at launch but flagged as the family's weak point, made worse by One UI 6/7 updates that increased drain noticeably
Ars Technica caught a 60GB Samsung system partition out of the box — 4x the size of a Pixel 7 Pro's, only one OS copy means ~30 min downtime per update
No S Pen, no UWB, no periscope telephoto — Samsung's flagship-tier extras stay on the Ultra
Engadget's verdict: 'A solid phone that's probably not worth the upgrade' over a recent S22/S21

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

Genuinely compact flagship — 6.1" body 'frees you from awkward big phones and camera spec overkill' (Android Central)
Same Snapdragon 8 Gen 2 for Galaxy chip as the Plus and Ultra — no performance compromise vs the more expensive siblings
Same 50MP main + 12MP ultrawide + 10MP 3x telephoto + 12MP selfie as the Plus — the 3x optical zoom is a real step up from rivals stuck at 2x
Display brightness up 35% from the S22 to 1750-nit peak; 120Hz Dynamic AMOLED 2X stays sharp and vibrant
Adopts the Ultra's floating-camera design — cohesive trio look without the contour bump
4 OS upgrades + 5 years of security — covers it through Android 17 and into 2027/2028

Cons

Only 25W wired charging — the Plus and Ultra get 45W, OnePlus 11 gets 80W; 0-100% takes ~1h12m even on the right charger
Just 3,900mAh battery — adequate at launch but flagged as the family's weak point, made worse by One UI 6/7 updates that increased drain noticeably
Ars Technica caught a 60GB Samsung system partition out of the box — 4x the size of a Pixel 7 Pro's, only one OS copy means ~30 min downtime per update
No S Pen, no UWB, no periscope telephoto — Samsung's flagship-tier extras stay on the Ultra
Engadget's verdict: 'A solid phone that's probably not worth the upgrade' over a recent S22/S21

Samsung Galaxy S23

Same bespoke Snapdragon 8 Gen 2 for Galaxy (3.36GHz) chip as the Plus and Ultra — no compromise. 40% faster than the S22 Ultra and meaningfully cooler. 8GB RAM keeps multitasking smooth even 3 years on.

Snapdragon 8 Gen 2 for Galaxy at 3.36GHz with 8GB RAM and 128GB UFS 3.1 base — same chip as the Plus and Ultra, no Exynos split.
Bespoke 8 Gen 2 for Galaxy is up to 40% faster than the S22 Ultra and adds Ray Tracing support for certain games.
Cool under normal use — even at 38-39°C ambient temps, no overheating issues; long-term performance holds up.
Three years in (2026): app opening, multitasking and Call of Duty still smooth — chip plus 8GB RAM has aged well.
Ars Technica caught a 60GB Samsung Android system partition out of the box — 4x the size of a Pixel 7 Pro's 15GB, and only one OS copy means ~30 min downtime during updates.

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

3,900mAh — the family's weakest point. Real-world ~5-6 hours of SOT typical (worsened by One UI 6/7), and only 25W charging means ~1h12m to full. The compact form factor's main cost.

3,900mAh battery — only 200mAh more than the S22, no 4,500mAh+ like the Plus. The smallest cell in the family.
Real-world: ~5-6 hours of SOT typical, comfortably a full day of moderate use, 1-1.5 days possible.
Battery life noticeably dropped after One UI 6 update — owner went from 5-6h SOT on 5G to barely 2h, recommends staying on Android 13 for best results.
Feb 2026 update real-world: ~4h SOT on Wi-Fi, drops to <2h on 5G — battery efficiency has gotten worse with time.
Charging caps at 25W (the Plus and Ultra get 45W): 0-100% takes ~1h12m on Samsung's 25W charger.