MacOS Sequoia, also known as macOS 15, is the version of Apple's desktop operating system that launched in 2024. AccordionItemContainerButton LargeChevron MacOS Sequoia, or macOS 15, is a free update for Apple computers. MacOS Sequoia FeaturesBelow, you'll find all the major features included in macOS 15. With macOS Sequoia, Apple improved Game Mode with smoother frame rates and “advanced power management features” to boost performance across its Macs. With macOS Sequoia, Apple improved Game Mode with smoother frame rates and “advanced power management features” to boost performance across its Macs.