OnePlus 15 VS Samsung Galaxy S25 Ultra

In terms of physical form, these two flagships are remarkably close. The OnePlus 15 is marginally slimmer (8.1 mm vs 8.2 mm), slightly lighter (215 g vs 218 g), and a touch more compact across all dimensions, resulting in a noticeably smaller overall volume (100.27 cm³ vs 103.59 cm³). In isolation, none of these differences would be perceptible in daily handling, but together they suggest the OnePlus 15 occupies a fractionally more pocketable footprint — relevant for users who are sensitive to large-phone ergonomics.

The more meaningful differentiator lies in water resistance. Both devices are rated waterproof, but the OnePlus 15 carries an IP69 certification, while the Galaxy S25 Ultra is rated IP68. IP68 guarantees protection from sustained submersion in water, which covers virtually all real-world scenarios like rain, splashes, or accidental drops in water. IP69, however, adds resistance to high-pressure, high-temperature water jets — a standard typically found in industrial equipment. For the vast majority of consumers this distinction will never matter in practice, but it is an objective step up in the protection hierarchy.

Neither phone has a rugged build or folding form factor, so both target the same mainstream slab design audience. Overall, the specs in this group give the OnePlus 15 a slight edge: it is marginally more compact and holds a technically superior IP rating, even if the practical day-to-day difference between the two is small.

The sharpness advantage belongs clearly to the Galaxy S25 Ultra, which pairs a larger 6.9″ panel with a 1440 x 3120 resolution at 498 ppi — noticeably crisper than the OnePlus 15's 450 ppi. At typical viewing distances this difference is subtle, but it becomes perceptible when reading small text, zooming into photos, or using the display for extended productivity work. Both screens share the same OLED/AMOLED panel technology and blanket HDR support, so the underlying image quality foundation is comparable.

Where the story flips is brightness and motion. The S25 Ultra's 2600 nits typical brightness dwarfs the OnePlus 15's 800 nits — a gap that translates directly into vastly superior outdoor legibility under direct sunlight. That said, the OnePlus 15 counters with a 165Hz refresh rate against the S25 Ultra's 120Hz, and a touch sampling rate of 330Hz versus 240Hz, delivering smoother scrolling and more responsive input — advantages that gamers and power users will genuinely feel. The OnePlus 15 also exclusively supports Dolby Vision, which enriches compatible streaming content with dynamic tone-mapping that HDR10+ alone does not replicate.

Taken together, these panels serve different priorities. The S25 Ultra is the stronger all-rounder for outdoor use and content consumption at the highest fidelity, while the OnePlus 15 is better tuned for fluidity and gaming. Given that the brightness gap is the single most impactful real-world differentiator in this group, the S25 Ultra holds the overall display edge — though users who prioritize high-refresh smoothness and Dolby Vision will find genuine reasons to prefer the OnePlus 15.

Both phones are built on Qualcomm silicon at 3 nm, but the chipsets are not the same generation. The OnePlus 15 runs the Snapdragon 8 Elite Gen 5, a newer iteration over the Snapdragon 8 Elite found in the S25 Ultra. The CPU clock speed advantage reflects this: the OnePlus 15's performance cores run at 4.6 GHz versus 4.47 GHz — a modest but real difference that compounds across sustained workloads. The GPU, memory architecture, and core thread count are otherwise identical between the two platforms.

Benchmark results make the performance gap concrete. The OnePlus 15 scores 3,434,000 on AnTuTu against the S25 Ultra's 2,207,809 — a lead of roughly 55%. Geekbench 6 tells a consistent story: single-core of 3,726 vs 3,057 and multi-core of 11,199 vs 9,846. These are not marginal rounding differences; they point to a chip that is meaningfully faster in both raw throughput and real-world responsiveness for demanding tasks like video editing, AI processing, and gaming. Compounding this, the OnePlus 15 ships with 16 GB of RAM compared to the S25 Ultra's 12 GB, which matters for sustained multitasking, keeping more apps resident in memory, and future-proofing against increasingly memory-hungry applications.

The OnePlus 15 holds a decisive performance advantage in this category. The combination of a newer, faster chipset and 33% more RAM creates a gap that neither software optimization nor identical GPU specs can fully bridge for the S25 Ultra.

The rear camera systems reveal fundamentally different philosophies. The OnePlus 15 deploys a triple-lens setup where every sensor is a uniform 50 MP, prioritizing consistency across focal lengths. The S25 Ultra counters with a four-lens array headlined by a 200 MP main sensor alongside 50 MP, 10 MP, and 50 MP lenses — a configuration that delivers significantly more pixel data for cropping, detail recovery, and computational photography. Paired with a BSI sensor (which the OnePlus 15 lacks), the S25 Ultra is better equipped to capture light in challenging conditions. The telephoto reach reinforces this gap: 5x optical zoom on the S25 Ultra versus 3.5x on the OnePlus 15, with a maximum focal length of 111 mm compared to 85 mm — a meaningful difference for wildlife, sports, or any scenario requiring reach without cropping.

A few smaller differentiators are worth noting. The S25 Ultra includes manual shutter speed control, which the OnePlus 15 omits — a relevant gap for photographers who shoot in manual mode, particularly in low light. The OnePlus 15 exclusively supports Dolby Vision recording, giving it an edge for users who prioritize cinematic video with dynamic tone mapping on compatible platforms. On the front camera, the specs flip: the OnePlus 15 offers 32 MP versus the S25 Ultra's 12 MP, with a slightly wider aperture advantage going to the S25 Ultra's f/2.2 vs f/2.4.

Overall, the S25 Ultra holds a clear camera advantage. The 200 MP primary sensor, four-lens versatility, superior telephoto reach, BSI sensor, and manual shutter control collectively represent a more capable and flexible imaging system. The OnePlus 15's higher-resolution selfie camera and Dolby Vision video are genuine wins, but they do not offset the S25 Ultra's breadth of photographic capability.

The most headline-worthy difference here is the Android version. The OnePlus 15 ships with Android 16, a full generation ahead of the Android 15 on the S25 Ultra. A newer OS version generally means access to the latest platform-level privacy controls, performance improvements, and developer APIs — and for users who care about having the most current software foundation out of the box, the OnePlus 15 holds a clear starting advantage.

Feature-by-feature, though, the S25 Ultra closes much of that gap. It uniquely offers cross-site tracking blocking, Wi-Fi password sharing, focus modes, and the ability to function as a PC — none of which are present on the OnePlus 15. The PC mode capability in particular is a productivity differentiator for users who want to connect their phone to a monitor and work in a desktop-like environment. Focus modes, meanwhile, are a meaningful quality-of-life feature for managing notifications and attention across different contexts. The OnePlus 15 offers none of these four features.

This group is genuinely split: the OnePlus 15 wins on OS recency, while the S25 Ultra wins on software feature breadth. For users who prioritize being on the latest Android version, the OnePlus 15 has the edge. For those who lean on ecosystem utility — especially productivity tools like PC mode — the S25 Ultra's software feature set is more complete despite running an older Android version.

Few spec comparisons in this sequence are as one-sided as this one. The OnePlus 15 carries a 7300 mAh battery against the S25 Ultra's 5000 mAh — a 46% larger cell that, all else being equal, translates directly into significantly more time between charges. For heavy users, travelers, or anyone who regularly ends the day in the red, that gap is not theoretical; it represents a meaningful reduction in charger dependency.

The charging speed disparity compounds the advantage further. The OnePlus 15 supports 120W wired charging versus the S25 Ultra's 45W — meaning the OnePlus 15 not only starts with more capacity but refills it dramatically faster. Wireless charging follows the same pattern: 50W versus 15W, and reverse wireless charging at 10W versus 4.5W. In practical terms, a quick top-up on the OnePlus 15 delivers substantially more charge in the same window of time. Adding to this, the OnePlus 15 comes bundled with a charger in the box — the S25 Ultra does not, which is a tangible out-of-box cost consideration for new buyers.

The OnePlus 15 wins this category decisively across every metric: larger battery, faster wired charging, faster wireless charging, faster reverse wireless charging, and an included charger. For users who treat battery life and charging speed as priorities, this is among the most compelling advantages the OnePlus 15 holds over the S25 Ultra in this entire comparison.

With no headphone jack on either device and stereo speakers shared across both, the meaningful battleground here is Bluetooth audio codec support — and it plays out as a genuine trade-off rather than a clean win for either side. The OnePlus 15 supports aptX Adaptive, Qualcomm's most advanced codec, which dynamically adjusts bitrate up to 24-bit/96kHz and offers low-latency performance suited for both music and gaming. The S25 Ultra foregoes aptX Adaptive in favor of LDAC, Sony's high-resolution codec capable of transmitting up to three times the data of standard Bluetooth audio at its highest quality setting.

The practical consequence is ecosystem-dependent. Users invested in Sony headphones or other LDAC-compatible gear will get significantly richer wireless audio from the S25 Ultra. Conversely, users with aptX Adaptive-certified headphones will extract a higher quality, lower-latency experience from the OnePlus 15. Both phones share aptX HD, providing a common high-quality baseline for a broad range of compatible headphones. The S25 Ultra also includes standard aptX, which widens its compatibility with older Qualcomm-certified audio accessories — a minor but practical convenience.

This group ends in a contextual tie. Neither phone is objectively superior; the better choice depends entirely on which wireless audio ecosystem a user is already in. LDAC gives the S25 Ultra an edge with Sony-ecosystem users, while aptX Adaptive makes the OnePlus 15 the stronger pick for those with newer Qualcomm-certified headphones. Users without a strong codec preference will find both devices equally capable at the aptX HD baseline.

Wireless connectivity is where these two diverge most clearly. The OnePlus 15 leaps ahead with Bluetooth 6 against the S25 Ultra's 5.4 — a newer standard that brings improvements in connection reliability, positioning accuracy, and energy efficiency. The S25 Ultra, however, adds Wi-Fi 6E to its wireless repertoire, giving it access to the less congested 6 GHz band for faster, more stable connections in dense network environments like offices or apartment buildings. The OnePlus 15 tops out at Wi-Fi 7, which is technically the faster standard, but without 6E it lacks that intermediate congestion-relief band.

SIM flexibility is another area where the S25 Ultra pulls ahead. It supports 2 physical SIMs plus 2 eSIMs, compared to the OnePlus 15's 2 physical SIMs only — a meaningful advantage for frequent travelers or users who juggle multiple carriers without swapping physical cards. The S25 Ultra also includes a stylus, which remains a defining productivity feature for note-taking and precision input that the OnePlus 15 simply cannot match. Additionally, ANT+ support on the S25 Ultra enables compatibility with a wide ecosystem of fitness and sports sensors — relevant for athletes using heart rate straps, cycling power meters, or similar peripherals.

The OnePlus 15 answers back with an infrared sensor, allowing it to function as a universal remote for TVs and other home appliances — a niche but genuinely useful feature absent on the S25 Ultra. On balance, though, the S25 Ultra holds the edge in this category: the combination of eSIM support, a bundled stylus, Wi-Fi 6E, and ANT+ compatibility represents a broader and more versatile connectivity and feature set for most users.

The Miscellaneous group offers no differentiation between these two devices. Every spec listed here — a video light, the absence of sapphire glass, a flat (non-curved) display, and no e-paper secondary screen — is identical across the OnePlus 15 and the Samsung Galaxy S25 Ultra. This is a complete tie, and there is no basis within this data to favor either product.