Buying a brand new high-end smartphone model is usually not cheap. That’s why you’ll want to consider whether your chosen product offers you the best value for your money, particularly in terms of overall performance, camera quality, and battery life. When evaluating a phone, the underlying RAM, CPU, and GPU architectures often become a bottleneck for gaming. OnePlus and Samsung tend to make very fair gaming phones while marketing them for everyday use, unlike some sub-brands of Nubia and, formerly, Asus. Most notably, comparing the OnePlus 15 and Samsung Galaxy S26 models is not that simple.
Technically, OnePlus offers two 15 series phones, the OnePlus 15 and the OnePlus 15R, while Samsung offers three: the base Samsung Galaxy S26, the Samsung Galaxy S26+, and the Samsung Galaxy S26 Ultra. The technical specifications of all the phones differ because the SoCs (system on a chip) are not shared across all models and Samsung, in particular, uses different processors in some of these devices depending on the region. Generally speaking, when comparing the essence of what gaming offers, the OnePlus 15 and Galaxy S26 Ultra often come up against each other, as they handle it best. While others are good enough to run games at moderate settings, they won’t always deliver optimal or sustained performance. That said, the OnePlus 15 is a bit better than the Samsung S26 as it can handle heavy gaming loads for longer than its rival.
Heat management and accessory support
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One of the reasons why gaming phones are very marketable is that they specialize in heat management solutions. These phones may look or feel bulkier because they typically have advanced cooling systems, such as built-in fans and vapor chambers, as well as larger additional batteries/grips. The idea behind good thermal management is to prevent your device from slowing down and maintain its performance when playing games. Not all everyday phones are equipped to handle this, which is why you sometimes feel like your smartphone is melting when you play games using 3D rendering for prolonged periods, like Wuthering Waves or Genshin Impact.
The OnePlus 15 excels in this area because OnePlus prioritizes sustained performance over peak performance. The device incorporates a specialized “glacier” cooling system, including layers of aerospace-grade airgel, a custom architecture with 10 heat zones, and console-quality gyroscopic controls. This also makes OnePlus efficient in handling peak temperatures. The Galaxy S26 Ultra doesn’t have this; instead, it relies on a larger surface area vapor chamber to stay cool, which is still great for handling demanding long-term use, but it’s still throttling.
Then the last consideration is accessories. Typically, one of the most important options is controller compatibility. Samsung devices generally do better in this regard, but OnePlus has its own line of exclusive game controllers: the OnePlus Strix G15. This only works with a handful of phones, however, such as the OnePlus 15R and OnePlus 15. Razer makes premium mobile controllers compatible with specific Samsung models, such as the Razer Kishi V3 Pro. For the OnePlus 15, it’s a matter of finding one that fits its size and plugs in via USB-C – Samsung simply has a stronger global presence in the market, so third-party manufacturers will prioritize support for Samsung smartphones over OnePlus.
The OnePlus 15 slightly exceeds in gaming performance
That’s not to say the Galaxy S26 Ultra doesn’t handle demanding games very well – it does – but the OnePlus 15 does it a little better over time. Both devices are powered by an iteration of Qualcomm Snapdragon 8 Elite Gen 5, which is one of the best, if not the best, SoCs on the market. It’s a beast for gaming, thanks to the combination of its custom Oryon CPU, Adreno High Performance Memory (HPM), advanced Adreno GPU, and 3nm architecture, which keeps the chip efficient and cool.
But what makes the OnePlus 15 better for gaming is actually the combination of its screen and battery. The OnePlus 15 can handle heavy gaming loads for longer thanks to its 7,300mAh battery, and it can charge faster at 120W (or 80W for North America-only models). On the other hand, the Galaxy S26 Ultra only has 5,000mAh and supports up to 60W charging. It has lower uptime and lower battery capacity. As for the display, the OnePlus 15 can reach up to 165Hz for gaming, while the Galaxy S26 Ultra is capped at 120Hz – both are respectable refresh rates for gaming.
Still, the higher refresh rate of the OnePlus 15 makes it noticeably more responsive and smooth during gaming. While technically the OnePlus edges out the Galaxy S26 Ultra, they’re both still monsters for gaming, and you can’t necessarily go wrong with either one: The benefits of getting the Galaxy S26 Ultra are that it’s still a more consistent phone in other areas, while still getting longer software support.
