Apple iOS 18.3 is compatible with all iPhones that can run iOS 18. This means all iPhones from the iPhone XS onwards, including the second- and third-generation iPhone SE models.

The latest OS update is available now for Apple's iPhone and iPad devices, bringing a few enhancements and one big change for Apple Intelligence.

Apple has rolled out iOS 18.3, which addresses 29 vulnerabilities including an issue with the core media framework already exploited in earlier iOS versions.

As part of this batch of software updates, Apple also released several patches fixing security bugs, including a zero-day bug that “may have been actively exploited” — meaning hackers were using it to compromise devices — against users with iPhones running software older than iOS 17.2, which was released in December 2023.

iOS 18.3 doesn't add any significant new features to Apple Intelligence—instead, it tweaks what's already there. Whereas Apple Intelligence was opt-in in previous OS versions, it is now on by default in iOS 18.3 on supported devices.

The AI tech DeepSeek used to train its reasoning model might be just what Apple needs for major Apple Intelligence developments on iPhone.

Apple has released fixes for dozens of vulnerabilities in its mobile and desktop products, including an iOS zero-day exploited in attacks.

Apple has kicked off iOS 18.3, iPadOS 18.3, and MacOS 15.3 with one significant change affecting AI. Since its debut, Apple Intelligence has required the extra step of actually turning it on or opting in. But with the new versions, Apple's AI feature is enabled by default for eliglble devices.

Apple Intelligence had a slow rollout, launching with a waitlist and only recently allowing access to AI images and its emoji generator. But following yesterday's release of iOS 18.3/iPadOS 18.3/MacOS 15.

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Apple has officially rolled out iOS 18.3 and iPadOS 18.3, marking the third significant update to the iOS 18 and iPadOS 18 software introduced last year. This latest update arrives approximately six weeks after the release of iOS 18.