AI comparison report

Xiaomi 15 Ultra vs Samsung S26 Ultra

By CompareAI Editorial Team · Published 2026-09-21 · How we compare

Choose the Xiaomi 15 Ultra for superior camera sensor size and faster charging, or choose the Samsung S26 Ultra for higher processing speeds, integrated S Pen…

Who wins: Xiaomi 15 Ultra or Samsung S26 Ultra?

Choose the Samsung S26 Ultra first if you prioritize raw computing performance, long-term software support for 7 years, and S Pen productivity; choose the Xiaomi 15 Ultra first if you prioritize superior sensor size with a 1-inch main camera and faster 90W charging speeds.

Based on our analysis across 5 dimensions with 20 sources, Xiaomi 15 Ultra scores 8.6/10 overall while Samsung S26 Ultra scores 9.1/10 overall.

DimensionXiaomi 15 UltraSamsung S26 Ultra
Camera & Imaging System9.3/109/10
Performance & Processing Power8.7/109.6/10
Display & Hardware Innovations8.3/109.4/10
Battery Life & Charging Speeds9.2/107.8/10
Software Support & Ecosystem Longevity7.5/109.5/10
Overall8.6/109.1/10

Should I choose Xiaomi 15 Ultra or Samsung S26 Ultra?

Verdict: Choose the Samsung S26 Ultra first if you prioritize raw computing performance, long-term software support for 7 years, and S Pen productivity; choose the Xiaomi 15 Ultra first if you prioritize superior sensor size with a 1-inch main camera and faster 90W charging speeds.

Choose the Xiaomi 15 Ultra for superior camera sensor size and faster charging, or choose the Samsung S26 Ultra for higher processing speeds, integrated S Pen productivity, and 7 years of software support.

The Xiaomi 15 Ultra excels in imaging hardware and power replenishment with its 1-inch Sony LYT-900 main sensor, 200MP periscope zoom, a larger 5,410 mAh battery, and faster 90W wired plus 50W wireless charging. In contrast, the Samsung S26 Ultra delivers higher processing output with its Snapdragon 8 Elite Gen 5 for Galaxy reaching up to 4.74GHz (compared to 4.32GHz on Xiaomi 15 Ultra), a larger 6.9-inch Dynamic AMOLED 2X panel with Privacy Display and built-in S Pen, and 7 years of Android OS upgrades versus Xiaomi 15 Ultra's 4 OS upgrade commitment.

Best for Xiaomi 15 Ultra

  • Users prioritizing maximum optical light capture via a 1-inch Sony LYT-900 sensor and 200MP Leica periscope telephoto lens
  • Users needing faster wired and wireless charging speeds with 90W HyperCharge and 50W wireless support
  • Users looking for larger battery capacity with a 5,410 mAh cell
  • Enthusiasts focused on dedicated Leica-tuned photography hardware

Best for Samsung S26 Ultra

  • Users wanting peak processing power with the Snapdragon 8 Elite Gen 5 for Galaxy clocked up to 4.74GHz
  • Users demanding the longest software longevity with 7 years of major OS upgrades and security patches
  • Productivity-focused users needing an integrated S Pen stylus and a larger 6.9-inch Dynamic AMOLED 2X display
  • Users valuing hardware-based Privacy Display technology and dedicated Galaxy AI tools
  • Mobile photographers preferring a dual optical telephoto setup offering dedicated 3x and 5x modules

When not to compare directly

Do not compare them directly when evaluating specialized hardware ecosystems, such as Samsung S26 Ultra's integrated S Pen stylus workflow and 7-year update policy versus Xiaomi 15 Ultra's high-wattage charging infrastructure and Leica optical co-engineering.

What are the key differences between Xiaomi 15 Ultra and Samsung S26 Ultra?

  • Camera & Imaging System

    While the Xiaomi 15 Ultra prioritizes light gathering with its massive 1-inch primary sensor and 200MP periscope lens, the Samsung Galaxy S26 Ultra utilizes a bright f/1.4 aperture on a 200MP main camera coupled with dual telephoto lenses.

    Xiaomi 15 Ultra: The Xiaomi 15 Ultra features a Leica-engineered quad-camera system highlighted by a large 1-inch Sony LYT-900 50MP primary sensor and a 200MP periscope telephoto lens with 4.3x optical zoom.

    Samsung S26 Ultra: The Samsung Galaxy S26 Ultra delivers a 200MP primary sensor with an f/1.4 aperture alongside a versatile dual telephoto setup offering dedicated 3x and 5x optical zoom modules.

    Scores — Xiaomi 15 Ultra: 9.3/10, Samsung S26 Ultra: 9/10

    Camera capability is the primary differentiator for flagship 'Ultra' smartphones, impacting photography quality, low-light capture, and optical zoom reach.

    Sources: Xiaomi 15 Ultra - Full phone specifications - GSMArena.com, Samsung Galaxy S26 Ultra Full Specifications - PhoneArena

  • Performance & Processing Power

    While the Xiaomi 15 Ultra features the standard Snapdragon 8 Elite clocked up to 4.32GHz, the Samsung S26 Ultra leverages the upgraded Snapdragon 8 Elite Gen 5 for Galaxy platform running at higher peak clock speeds of up to 4.74GHz [1, 18].

    Xiaomi 15 Ultra: The Xiaomi 15 Ultra is powered by Qualcomm's standard Snapdragon 8 Elite 3nm mobile platform paired with up to 16GB of LPDDR5X RAM, delivering peak clock speeds up to 4.32GHz across its Oryon prime CPU cores [1, 3].

    Samsung S26 Ultra: The Samsung S26 Ultra runs on the customized Snapdragon 8 Elite Gen 5 for Galaxy chipset built on a 2nm-class architecture with up to 16GB of RAM, achieving enhanced custom peak frequencies up to 4.74GHz for demanding AI and gaming workloads [18, 20].

    Scores — Xiaomi 15 Ultra: 8.7/10, Samsung S26 Ultra: 9.6/10

    Processor architecture and RAM options dictate day-to-day responsiveness, gaming capability, and on-device AI performance over time.

    Sources: Xiaomi 15 Ultra - Full phone specifications - GSMArena.com, Qualcomm Snapdragon 8 Elite Gen 5 for Galaxy Processor

  • Display & Hardware Innovations

    While the Xiaomi 15 Ultra provides a 6.73-inch WQHD+ panel, the Samsung S26 Ultra delivers a larger 6.9-inch Dynamic AMOLED 2X display integrated with dedicated Privacy Display hardware and built-in S Pen stylus support.

    Xiaomi 15 Ultra: The Xiaomi 15 Ultra features a 6.73-inch WQHD+ LTPO AMOLED display with a 3200 x 1440 resolution, offering sharp visuals and high peak brightness for general media viewing.

    Samsung S26 Ultra: The Samsung S26 Ultra features a 6.9-inch Dynamic AMOLED 2X display equipped with hardware-based Privacy Display technology and an integrated S Pen for enhanced productivity.

    Scores — Xiaomi 15 Ultra: 8.3/10, Samsung S26 Ultra: 9.4/10

    Screen quality, structural durability, and specialized input features like stylus support define everyday interaction and productivity.

    Sources: Xiaomi 15 Ultra - Full phone specifications - GSMArena.com, Samsung Galaxy S26 Ultra Full Specifications - PhoneArena

  • Battery Life & Charging Speeds

    The Xiaomi 15 Ultra provides a larger 5,410 mAh battery with faster 90W wired charging, outperforming the Samsung S26 Ultra's 5,000 mAh capacity and 60W wired charging rate.

    Xiaomi 15 Ultra: The Xiaomi 15 Ultra features a 5,410 mAh battery supported by 90W wired HyperCharge and 50W wireless charging speeds for rapid replenishment.

    Samsung S26 Ultra: The Samsung S26 Ultra is equipped with a 5,000 mAh battery paired with 60W wired fast charging and 15W Qi2 wireless charging.

    Scores — Xiaomi 15 Ultra: 9.2/10, Samsung S26 Ultra: 7.8/10

    Battery capacity and charge rates govern uptime and convenience for power users throughout heavy daily workflows.

    Sources: Xiaomi 15 Ultra - Full phone specifications - GSMArena.com, Samsung Galaxy S26 Ultra Full Specifications - PhoneArena

  • Software Support & Ecosystem Longevity

    The Samsung S26 Ultra guarantees up to 7 years of OS updates, surpassing the 4 major Android OS upgrades supported on the Xiaomi 15 Ultra.

    Xiaomi 15 Ultra: The Xiaomi 15 Ultra runs HyperOS 2 based on Android 15 with Google Gemini AI integration, backed by 4 major Android OS upgrades and 5 years of security patches.

    Samsung S26 Ultra: The Samsung S26 Ultra launches on Android 16 with Galaxy AI tools, supported by Samsung's commitment of up to 7 years of major OS upgrades and security updates.

    Scores — Xiaomi 15 Ultra: 7.5/10, Samsung S26 Ultra: 9.5/10

    Long-term operating system updates, AI integrations, and manufacturer software ecosystems influence device security, resale value, and lifespan.

    Sources: Xiaomi 15 Ultra - Full phone specifications - GSMArena.com, Samsung Galaxy S26 Ultra - Specifications - Vodafone Ireland

What are the pros and cons of Xiaomi 15 Ultra vs Samsung S26 Ultra?

Xiaomi 15 Ultra

Strengths

  • The Xiaomi 15 Ultra features a Leica-engineered quad-camera system with a large 1-inch Sony LYT-900 50MP primary sensor and a 200MP periscope telephoto lens with 4.3x optical zoom.
  • The Xiaomi 15 Ultra offers a larger 5,410 mAh battery capacity compared to competitors.
  • The Xiaomi 15 Ultra supports fast charging capabilities with 90W wired HyperCharge and 50W wireless charging speeds.
  • The Xiaomi 15 Ultra comes equipped with a sharp 6.73-inch WQHD+ LTPO AMOLED display with a 3200 x 1440 resolution.

Weaknesses

  • The Xiaomi 15 Ultra runs the standard Snapdragon 8 Elite platform with clock speeds up to 4.32GHz, which is lower than the Samsung S26 Ultra's 4.74GHz peak clock speeds.
  • The Xiaomi 15 Ultra lacks built-in stylus hardware and dedicated hardware Privacy Display technology.
  • The Xiaomi 15 Ultra is limited to 4 major Android OS upgrades and 5 years of security patches, falling short of Samsung's 7-year support window.

Samsung S26 Ultra

Strengths

  • The Samsung S26 Ultra is powered by the customized Snapdragon 8 Elite Gen 5 for Galaxy 2nm-class chipset, reaching higher peak clock speeds of up to 4.74GHz.
  • The Samsung S26 Ultra features a larger 6.9-inch Dynamic AMOLED 2X display equipped with hardware-based Privacy Display technology and an integrated S Pen.
  • The Samsung S26 Ultra delivers a versatile camera system with a 200MP f/1.4 primary sensor and dual telephoto lenses offering dedicated 3x and 5x optical zoom modules.
  • The Samsung S26 Ultra guarantees industry-leading long-term software support with up to 7 years of major OS upgrades and security updates on Android 16.

Weaknesses

  • The Samsung S26 Ultra carries a smaller 5,000 mAh battery compared to the Xiaomi 15 Ultra's 5,410 mAh cell.
  • The Samsung S26 Ultra features slower charging speeds, limited to 60W wired charging and 15W Qi2 wireless charging.

Where does this data come from?

  1. Xiaomi 15 Ultra - Full phone specifications - GSMArena.com
  2. Samsung Galaxy S26 Ultra | Specs & Features
  3. Xiaomi 15 Ultra Specs
  4. Samsung Galaxy S26 Ultra Full Specifications - PhoneArena
  5. Xiaomi 15 Ultra Specs, Features
  6. Galaxy S26 Ultra - Samsung
  7. Xiaomi 15 Ultra - Xiaomi Global
  8. Specs | Samsung Galaxy S26 Ultra
  9. Xiaomi 15 Ultra: My Review After 2 Weeks of Testing It Around Europe
  10. Samsung Galaxy S26 Ultra - Specifications - Vodafone Ireland
  11. Xiaomi 15 Ultra review: Our high expectations have been met
  12. Samsung Galaxy S26 Ultra Specs, Features (Phone Scoop)
  13. Price and specifications on Xiaomi 15 Ultra - Kimovil
  14. Galaxy S26 Ultra | Samsung Mobile Press
  15. Xiaomi 15 Ultra - DXOMARK
  16. Specs | Samsung Galaxy S26 Ultra
  17. Xiaomi 15 Ultra review: two steps forward and one step back
  18. Qualcomm Snapdragon 8 Elite Gen 5 for Galaxy Processor
  19. Xiaomi 15 Ultra Camera test
  20. I benchmarked Samsung's Galaxy S26 series against ...

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