The YouTube channel PhoneBuff conducted a large-scale speed comparison of several flagship smartphones released in 2026 to evaluate their real-world performance in both everyday and demanding workloads.

Devices tested

The comparison included:

  • Samsung Galaxy S26 Ultra
  • iPhone 17 Pro Max
  • Google Pixel 10 Pro XL
  • OnePlus 15
  • Oppo Find X9 Pro
  • Vivo X300 Ultra

Test results

In lighter tasks such as launching applications, switching between apps, and web browsing, the differences between the devices were minimal, often amounting to less than a second.

However, once the testing moved to more demanding workloads—including resource-intensive applications and AI-related tasks—the gap between the smartphones became more apparent.

The Google Pixel 10 Pro XL, powered by Google's Tensor G5 processor, delivered the weakest overall performance. According to the test results, it finished more than 30% behind the leading device.

The winner was the Samsung Galaxy S26 Ultra, which demonstrated the most consistent and balanced performance, particularly in heavy workloads. This gave it a clear overall lead in the benchmark.

Second place went to the Vivo X300 Ultra. The iPhone 17 Pro Max, OnePlus 15, and Oppo Find X9 Pro produced closely matched results and finished in a tightly grouped pack.

Conclusion

While performance differences among modern flagship smartphones are barely noticeable during routine use, the tests suggest that more demanding workloads and AI processing can reveal meaningful gaps. In these scenarios, the Samsung Galaxy S26 Ultra showed the strongest overall performance, earning the title of the fastest smartphone of 2026 according to PhoneBuff.

In short

According to PhoneBuff's large-scale comparison, the Samsung Galaxy S26 Ultra was the fastest smartphone tested in 2026. It outperformed competitors in demanding applications and AI-related workloads, while the Vivo X300 Ultra took second place. The Google Pixel 10 Pro XL delivered the weakest performance, finishing more than 30% behind the leader. In everyday use, however, the differences between flagship devices remained relatively small.