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Smartphone comparison

Xiaomi 18 Pro Max vs Xiaomi 15 Ultra

Compare cameras, battery, screen and everyday features.

Compared products
01Selected
Xiaomi 18 Pro Max

Xiaomi 18 Pro Max

  • About 120 Hz display refresh rate.
  • About 6.9 inch screen.
  • Qualcomm SM8975 Snapdragon 8 Elite Extreme Gen 6 (2 nm) processor.
  • Storage: UFS 4.1.
  • 8,500 mAh battery capacity.
KSh 170,000Out of Stock
02
Xiaomi 15 Ultra

Xiaomi 15 Ultra

  • About 120 Hz display refresh rate.
  • About 6.73 inch screen.
  • Qualcomm SM8750-AB Snapdragon 8 Elite (3 nm) processor.
  • Storage: UFS 4.1.
  • 90 W rated wired charging power.
KSh 142,000In Stock
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Xiaomi 17 UltraKSh 164,000
Google Pixel 11 Pro XL 512GBKSh 166,000
iPhone 17 Pro MaxKSh 162,000
Google Pixel 11 Pro 512GBKSh 157,000
iPhone 17 ProKSh 155,000
Vivo X500 Pro MaxKSh 200,000
Vivo X300 UltraKSh 200,000
2 of 4 products

Our quick verdict

The Xiaomi 18 Pro Max has a much bigger battery (8,500 mAh), a larger 6.9-inch, brighter screen, a higher-resolution main camera (200 MP) and sharper selfies (50 MP), while the Xiaomi 15 Ultra has a sharper screen, charges faster wirelessly (80 W) and offers video output to a monitor over USB-C.

Display

Xiaomi 18 Pro Max
About 6.9 inch screen
Xiaomi 15 Ultra
About 6.73 inch screen

Performance

Xiaomi 18 Pro Max
Qualcomm SM8975 Snapdragon 8 Elite Extreme Gen 6 (2 nm) processor
Xiaomi 15 Ultra
Qualcomm SM8750-AB Snapdragon 8 Elite (3 nm) processor

Charging

Xiaomi 18 Pro Max
100 W rated wired charging power
Xiaomi 15 Ultra
90 W rated wired charging power

Battery capacity

Xiaomi 18 Pro Max
8,500 mAh battery
Xiaomi 15 Ultra
5,410 mAh battery

Weight

Xiaomi 18 Pro Max
235 g
Xiaomi 15 Ultra
226 g

Key differences

The main differences to help you choose.

Xiaomi 18 Pro Max

  • Bigger battery: 8,500 mAh (vs 5,410 mAh).
  • Higher rated immersion depth: 6 m (vs 1.5 m), both IP68.
  • Higher-resolution main camera: 200 MP (vs 50 MP).
  • Larger 6.9-inch screen (vs 6.73-inch).
  • Brighter display: up to 4,000 nits (vs 3,200).
  • Higher-resolution selfie camera: 50 MP (vs 32 MP).

Xiaomi 15 Ultra

  • Sharper screen: 522 ppi (vs 418 ppi).
  • Faster wireless charging: 80 W (vs 50 W).
  • Video output to an external display over USB-C.
  • Video output to a monitor over USB-C (DisplayPort).

What matters most to you?

Choose any priorities

How each product answers the questions buyers ask most. Tick a topic to add it, untick one to hide it.

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6 priorities selected.
How each product answers the selected priorities
PriorityXiaomi 18 Pro MaxXiaomi 15 Ultra
Display6.9-inch OLED display, 120 Hz, 418 ppi6.73-inch OLED display, 120 Hz, 522 ppi
Camera200 MP main camera with OIS, plus a 3.2x telephoto camera50 MP main camera with OIS, plus a 3x telephoto camera
PerformanceQualcomm Snapdragon 8 Elite Extreme Gen 6 processorQualcomm Snapdragon 8 Elite processor
Battery capacity8,500 mAh battery5,410 mAh battery
Charging100 W wired, 50 W wireless charging90 W wired, 80 W wireless charging
Weight235 g226 g

Detailed comparison

Explore the full specifications, section by section.

General

General specifications comparison
SpecificationXiaomi 18 Pro MaxXiaomi 15 Ultra
BrandXiaomiXiaomi
Model18 Pro Max15 Ultra
Announced2026, September 232025, February 27
Release statusAvailable. Released 2026, September 23Available. Released 2025, February 27
Model numbers2611FPNFAG25010PN30G

Design

Design specifications comparison
SpecificationXiaomi 18 Pro MaxXiaomi 15 Ultra
Dimensions163.4 x 77.6 x 8.4 mm (6.43 x 3.06 x 0.33 in)161.3 x 75.3 x 9.4 mm (6.35 x 2.96 x 0.37 in)
Weight235 g or 240 g (8.29 oz)226 g or 229 g (7.97 oz)
Build materialsGlass front (Dragon Crystal Glass 3), aluminum frameGlass front, glass-fiber reinforced plastic back or silicone polymer back (eco leather), aluminum frame
Additional body features—Aerospace-grade glass fiber

Display

Display specifications comparison
SpecificationXiaomi 18 Pro MaxXiaomi 15 Ultra
Display6.9 inches, 116.2 cm2 (~91.6% screen-to-body ratio); LTPO AMOLED, 68B colors, 2160Hz PWM, 120Hz, Dolby Vision, HDR Vivid, HDR10+, BT.2020, 4000 nits (peak)6.73 inches, 108.9 cm2 (~89.7% screen-to-body ratio); LTPO AMOLED, 68B colors, 120Hz, 1920Hz PWM, Dolby Vision, HDR10+, HDR Vivid, 3200 nits (peak)
Screen resolution1208 x 2624 pixels, 19.5:9 ratio (~418 ppi density)1440 x 3200 pixels, 20:9 ratio (~522 ppi density)
Display protectionXiaomi Dragon Crystal Glass 3Xiaomi Shield Glass 2.0
Display featuresSecondary display (on the back): LTPO AMOLED, 120Hz, Dolby Vision, HDR Vivid, HDR10+, BT.2020, 4000 nits (peak) 2.9 inches, 596 x 976 pixelsLTPO AMOLED, 68B colors, 120Hz, 1920Hz PWM, Dolby Vision, HDR10+, HDR Vivid, 3200 nits (peak)

Performance

Performance specifications comparison
SpecificationXiaomi 18 Pro MaxXiaomi 15 Ultra
ProcessorQualcomm SM8975 Snapdragon 8 Elite Extreme Gen 6 (2 nm)Qualcomm SM8750-AB Snapdragon 8 Elite (3 nm)
CPUOcta-core (2x5.01 GHz Prime + 3x4.03 GHz Performance + 3x3.74 GHz Performance)Octa-core (2x4.32 GHz Oryon V2 Phoenix L + 6x3.53 GHz Oryon V2 Phoenix M)
GPUAdreno 850Adreno 830

Memory & Storage

Memory & Storage specifications comparison
SpecificationXiaomi 18 Pro MaxXiaomi 15 Ultra
RAM12GB / 16GB12GB / 16GB
Storage256GB / 512GB / 1TB256GB / 512GB / 1TB
Storage technologyUFS 4.1UFS 4.1
Expandable storageNoNo
Memory configurations256GB 12GB RAM, 512GB 12GB RAM, 512GB 16GB RAM, 1TB 16GB RAM256GB 12GB RAM, 512GB 16GB RAM, 1TB 16GB RAM

Cameras

Cameras specifications comparison
SpecificationXiaomi 18 Pro MaxXiaomi 15 Ultra
Rear camera200 MP, f/1.7, 23mm (wide), 1/1.28", 0.61µm, dual pixel PDAF, OIS 200 MP, f/2.4, 75mm (periscope telephoto), 1/1.56", PDAF (10cm - ∞), OIS, 3.2x optical zoom 50 MP, f/2.4, 17mm, 102˚ (ultrawide), 1/2.88", 0.61µm, PDAF50 MP, f/1.6, 23mm (wide), 1.0"-type, 1.6µm, dual pixel PDAF, OIS 50 MP, f/1.8, 70mm (telephoto), 1/2.51", 0.7µm, dual pixel PDAF (10cm - ∞), OIS, 3x optical zoom 200 MP, f/2.6, 100mm (periscope telephoto), 1/1.4", 0.56µm, multi-directional PDAF, OIS, 4.3x optical zoom 50 MP, f/2.2, 14mm, 115˚ (ultrawide), 1/2.76", 0.64µm, dual pixel PDAF TOF 3D, (depth)
Front camera50 MP, f/2.2, 21mm (wide), 1/2.88", 0.61µm, PDAF32 MP, f/2.0, 21mm (wide), 1/3.14", 0.7µm
Rear camera featuresLaser AF, color spectrum sensor, Leica lens, Dual-LED dual-tone flash, HDR, panoramaLaser AF, color spectrum sensor, Leica lenses, Dual-LED flash, HDR, panorama, 67mm filter ring holder (optional)
Rear camera video8K@30fps (HDR), 4K@30/60/120fps (HDR10+, 10-bit Dolby Vision HDR, 10-bit LOG), 1080p@30/60/120/240/960fps, 720p@1920fps, gyro-EIS8K@30fps, 4K@30/60/120fps, 1080p@30/60/120/240/480/960/1920fps, gyro-EIS, Dolby Vision HDR 10-bit rec. (4K@60fps, 1080p)
Front camera featuresHDR, panoramaHDR, panorama
Front camera video4K@30/60fps, 1080p@30/60fps, HDR10+, gyro-EIS4K@30/60fps, 1080p@30/60fps, gyro-EIS

Battery & Charging

Battery & Charging specifications comparison
SpecificationXiaomi 18 Pro MaxXiaomi 15 Ultra
BatterySi/C Li-Ion 8500 mAhMarket-dependent versions: · Si/C Li-Ion 5410 mAh - Global · Si/C Li-Ion 6000 mAh - China
Charging100W wired, PD3.0, QC3+, 100W PPS 50W wireless 27W reverse wireless90W wired, PD3.0, QC3+ 80W wireless 10W reverse wireless

Software

Software specifications comparison
SpecificationXiaomi 18 Pro MaxXiaomi 15 Ultra
Operating systemAndroid 17, HyperOS 4Android 15, up to 4 major OS updates, HyperOS 3

Network

Network specifications comparison
SpecificationXiaomi 18 Pro MaxXiaomi 15 Ultra
NetworkGSM / HSPA / LTE / 5GGSM / HSPA / LTE / 5G
SIMNano-SIM + Nano-SIM· Nano-SIM + Nano-SIM · Nano-SIM + Nano-SIM + eSIM + eSIM (max 2 at a time)
2G bandsGSM 850 / 900 / 1800 / 1900GSM 850 / 900 / 1800 / 1900
3G bandsHSDPA 800 / 850 / 900 / 1700(AWS) / 1900 / 2100HSDPA 800 / 850 / 900 / 1700(AWS) / 1900 / 2100
4G bands1, 2, 3, 4, 5, 7, 8, 12, 13, 14, 17, 18, 19, 20, 25, 26, 28, 29, 34, 38, 39, 40, 41, 42, 43, 48, 66, 711, 2, 3, 4, 5, 7, 8, 12, 13, 17, 18, 19, 20, 25, 26, 28, 32, 38, 39, 40, 41, 42, 48, 66, 71 - International; 1, 2, 3, 4, 5, 7, 8, 12, 17, 18, 19, 20, 26, 28, 34, 38, 39, 40, 41, 42, 48, 66 - China
5G bands1, 2, 3, 5, 7, 8, 12, 13, 14, 18, 20, 25, 26, 28, 29, 38, 40, 41, 48, 66, 70, 71, 77, 78, 79, 80, 81, 83, 84, 89 SA/NSA1, 2, 3, 5, 7, 8, 12, 20, 25, 26, 28, 38, 40, 41, 48, 66, 71, 75, 77, 78, 79 SA/NSA - International; 1, 2, 3, 5, 7, 8, 12, 20, 26, 28, 38, 40, 41, 48, 66, 77, 78, 79, 80, 81, 83, 84, 89 SA/NSA - China
Network speedHSPA, LTE, 5GHSPA, LTE, 5G

Connectivity

Connectivity specifications comparison
SpecificationXiaomi 18 Pro MaxXiaomi 15 Ultra
NFCYesYes
Bluetooth6.0, A2DP, LE, aptX HD, aptX Adaptive, LHDC 56.0, A2DP, LE, aptX HD, aptX Adaptive, LHDC 5
Wi-FiWi-Fi 802.11 a/b/g/n/ac/6e/7, dual-band, Wi-Fi DirectWi-Fi 802.11 a/b/g/n/ac/6e/7, dual-band or tri-band, Wi-Fi Direct
PositioningGPS (L1+L5), BDS (B1I+B1c+B2a), GALILEO (E1+E5a), QZSS (L1+L5), NavIC (L5), GLONASSGPS (L1+L5), BDS (B1I+B1c+B2a), GALILEO (E1+E5a), QZSS (L1+L5), NavIC (L5), GLONASS
RadioNoNo
USBUSB Type-C 3.2, Display Port, OTGUSB Type-C 3.2 Gen 2, DisplayPort, OTG
Ultra Wideband (UWB)Ultra Wideband (UWB) support—
InfraredYesYes
Satellite features—Two-way satellite communication (China model only)

Durability

Durability specifications comparison
SpecificationXiaomi 18 Pro MaxXiaomi 15 Ultra
Water resistanceIP68 dust tight and water resistant (immersible up to 6m for 30 min)IP68 dust tight and water resistant (immersible up to 1.5m for 30 min)

Features

Features specifications comparison
SpecificationXiaomi 18 Pro MaxXiaomi 15 Ultra
SensorsFingerprint (under display, ultrasonic), accelerometer, proximity, gyro, compass, barometerFingerprint (under display, ultrasonic), accelerometer, proximity, gyro, compass, barometer
ColorsBlack, White, Pink, Red, BlueBlack, White, Silver Chrome, Green
Additional featuresUltra Wideband (UWB) supportTwo-way satellite communication (China model only)

Audio

Audio specifications comparison
SpecificationXiaomi 18 Pro MaxXiaomi 15 Ultra
LoudspeakersYes, with stereo speakers (3 speakers, with Dolby Atmos)Yes, with stereo speakers
3.5 mm headphone jackNoNo
Audio features24-bit/192kHz Hi-Res & Hi-Res wireless audio; Snapdragon sound24-bit/192kHz Hi-Res & Hi-Res Wireless audio; Qualcomm XPAN (24-bit/96kHz audio)

Regulatory

Regulatory specifications comparison
SpecificationXiaomi 18 Pro MaxXiaomi 15 Ultra
SAR (EU)—1.00 W/kg (head)     1.00 W/kg (body)

Tests

Tests specifications comparison
SpecificationXiaomi 18 Pro MaxXiaomi 15 Ultra
Measured loudspeaker loudness—-24.1 LUFS (Very good)
Active use battery score—Active use score 16:13h

EU label

EU label specifications comparison
SpecificationXiaomi 18 Pro MaxXiaomi 15 Ultra
Energy—Class A
Battery—58:58h endurance, 1000 cycles
Free fall—Class C (90 falls)
Repairability—Class C

Similarities

  • Both are rated IP68.
  • Both have optical image stabilisation.
  • Both support Wi-Fi 7.
  • Both use Bluetooth 6.0.
  • Both have NFC.
  • Both have an aluminium frame.

In summary

Get the Xiaomi 18 Pro Max if you want a much bigger battery and a larger 6.9-inch, brighter screen, or the Xiaomi 15 Ultra if you would rather have a sharper screen and faster wireless charging.

Back to compared products ↑

In-stock alternatives

Google Pixel 11 Pro XL 512GBFor Xiaomi 18 Pro MaxGoogle Pixel 11 Pro XL 512GBView product ↗Google Pixel 11 Pro 512GBFor Xiaomi 18 Pro MaxGoogle Pixel 11 Pro 512GBView product ↗Google Pixel 11 Pro 256GBFor Xiaomi 15 UltraGoogle Pixel 11 Pro 256GBView product ↗Xiaomi 17 Pro MaxFor Xiaomi 15 UltraXiaomi 17 Pro MaxView product ↗

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