Which has the bigger battery, the Nothing Phone (3) or the OnePlus 13?

The OnePlus 13 has the bigger battery: 6,000 mAh against 5,150 mAh. Real battery life also depends on the chip and screen.

Which was cheaper at launch?

The Nothing Phone (3) launched at $799, against $899 for the OnePlus 13 (US launch prices; street prices drop over time).

The Nothing Phone (3) is 2.3 mm shorter, 0.9 mm narrower, 0.5 mm thicker and 8 g heavier than the OnePlus 13. Its screen is 0.15" smaller.

Body	Nothing Phone (3)	OnePlus 13
Size	160.6 × 75.6 × 9 mm	162.9 × 76.5 × 8.5 mm
Thickness	9 mm	8.5 mm (better)
Weight	218 g	210 g? (better)
Frame	Aluminum1	metal1
Back	Gorilla Glass Victus1	glass (white and black), vegan leather (blue)1
Water resistance	IP68	IP68/IP69 (better)
Colours	White, Black	Arctic Dawn, Black Eclipse, Midnight Ocean

Performance and software	Nothing Phone (3)	OnePlus 13
Chipset	Qualcomm SM8735 Snapdragon 8s Gen 4	Snapdragon 8 Elite Mobile Platform
CPU	Octa-core (1x3.21 GHz Cortex-X4 & 3x3.0 GHz Cortex-A720 & 2x2.8 GHz Cortex-A720 & 2x2.0 GHz Cortex-A720)1	Qualcomm Oryon CPU @4.32GHz
Process	—	3 nm1
Ships with	Android 15 with Nothing OS 3.5	OxygenOS 15.0 based on Android 15

Cameras	Nothing Phone (3)	OnePlus 13
Rear	50 MP Main, OIS 50 MP Periscope telephoto (3× optical), OIS 50 MP Ultrawide	50 MP Main, OIS 50 MP Telephoto (3× optical), OIS 50 MP Ultrawide
Main camera	50 MP	50 MP
Optical zoom	3×	3×
Front	50 MP	32 MP
Video	4K at 60 fps1	8K at 30 fps (rear)

Features	Nothing Phone (3)	OnePlus 13
Fingerprint	Under-display optical	Ultrasonic
Stereo speakers	Yes	—

Highlighted: the better value where one is clearly better. Sources for each phone are listed on the Nothing Phone (3) and OnePlus 13 pages.

Is the Nothing Phone (3) bigger than the OnePlus 13?: The Nothing Phone (3) is 2.3 mm shorter, 0.9 mm narrower, 0.5 mm thicker and 8 g heavier than the OnePlus 13. Its screen is 0.15" smaller.
Which has the bigger battery, the Nothing Phone (3) or the OnePlus 13?: The OnePlus 13 has the bigger battery: 6,000 mAh against 5,150 mAh. Real battery life also depends on the chip and screen.
Which was cheaper at launch?: The Nothing Phone (3) launched at $799, against $899 for the OnePlus 13 (US launch prices; street prices drop over time).