What’s New in macOS Sequoia 15.4
Apple Intelligence Expansion
Apple Intelligence takes center stage in macOS Sequoia 15.4 with a substantial expansion of language support. The on-device and server-based AI capabilities now work in French, German, Italian, Portuguese (Brazil), Spanish, Japanese, Korean, and simplified Chinese. Localized English variants for Singapore and India are also included, nearly doubling the number of supported regions. Users can switch to any of these languages without losing core functionalities such as Writing Tools, notification summaries, and smarter Siri interactions. Under the hood, Apple’s Private Cloud Compute ensures that complex requests remain encrypted and ephemeral, a crucial differentiator for enterprise and privacy-conscious users. The rollout is paired with stricter on-device processing policies, requiring explicit opt-in for cloud-assisted features. App developers gain access to updated App Intents frameworks, so third-party apps can surface actions in the new Siri contextual menu more naturally in the expanded languages. This release marks the first time Apple Intelligence is available in the European Union without a VPN workaround, complying fully with the Digital Markets Act.
Priority Notifications
A long-awaited Apple Intelligence feature, Priority Notifications, debuts in 15.4. When enabled, the system scans incoming alerts in real time and surfaces the most critical ones at the top of the Notification Center stack. The machine learning model evaluates sender importance, time sensitivity, and your typical response patterns while processing everything entirely on-device. A subtle visual indicator—a shimmering border—differentiates prioritized alerts from standard ones. Early testing shows it effectively surfaces calendar invites, breaking news alerts, and messages from VIP contacts while suppressing promotional emails and social media likes. You maintain full control; the feature can be toggled off per app or globally in System Settings under Notifications. Unlike competing AI triage systems, Apple’s implementation does not require uploading notification content to any cloud service, preserving the end-to-end encryption of iMessage and other secure communications.
Image Playground Gets a Sketch Style
Image Playground, the image generation tool embedded in notes, messages, and dedicated apps, receives a third visual style. Alongside Animation and Illustration, the new Sketch style produces monochrome, hand-drawn aesthetic images with varied line weights and subtle shading. The model was fine-tuned on millions of sketches and recognizes prompts like “pencil drawing,” “ink,” or “charcoal” to adjust the output. The style excels at depicting faces, animals, and simple scenes, while complex mechanical prompts remain better suited to Illustration mode. The entire generation pipeline still runs locally on Apple silicon’s Neural Engine, keeping render times under two seconds on M-series Macs. Images are saved with a metadata tag indicating they were AI-generated, aligning with the C2PA standard for digital content provenance.
Apple News+ Food
A novel curated experience lands in the News app exclusively for Apple News+ subscribers. The Food section aggregates tens of thousands of professionally tested recipes from sources such as Bon Appétit, Food & Wine, and regional publishers. Recipes are displayed in a unified format with clear ingredient lists, step-by-step instructions, and built-in timers that sync across your Apple devices. A “Cook” mode locks the screen and increases text size, making it practical to use a MacBook in the kitchen. Editorial content includes restaurant reviews, seasonal cooking guides, and interviews with chefs. Currently available in the United States, United Kingdom, Canada, and Australia, the section requires a $12.99 monthly subscription but is included for Apple One Premier users. Engaged readers can save recipes to a personal digital cookbook that syncs via iCloud with iOS 18.4 and iPadOS 18.4 devices.
Fresh Emojis
macOS Sequoia 15.4 integrates eight new emoji characters from Unicode 16.0. Users can now express exhaustion with a face bearing distinct under‑eye bags, identify themselves biometrically with a fingerprint emoji, or discuss climate change using a leafless tree. The set also includes a root vegetable (likely a radish or turnip), a harp for musicians, a purple paint splatter, a shovel, and the flag of the Channel Island of Sark. These additions appear system‑wide in the emoji picker, keyboard, and third‑party apps that use Apple’s standard rendering. The update also brings subtle refinements to existing emoji, including improved contrast for the family silhouettes and more realistic metallic sheen on tools.
Safari, Photos, and Mail Improvements
Safari’s Start Page receives a customization overhaul in 15.4. Users can now drag-and-drop sections to reorder Favorites, Reading List, and Privacy Report tiles. A new “Highlights” strip uses on‑device intelligence to surface relevant snippets from visited sites, such as restaurant hours or event dates, without compromising your browsing history. Intelligent Tracking Prevention gains an anti‑fingerprinting boost that randomizes system configuration readouts more aggressively, foiling advanced web trackers.
The Photos app introduces smarter search that understands complex spatial queries like “dog sitting on the couch in the living room,” leveraging the improved Visual Look Up model. Apple Mail’s on‑device categorization, first seen on iOS 18.4, arrives on the Mac, automatically sorting emails into Primary, Transactions, Updates, and Promotions. The categories can be reorganized, and users can revert to the classic unified inbox at any time. For business users, Mail now supports automatic calendar event extraction from emails written in the newly supported Apple Intelligence languages.
Security and Privacy Updates
Apple addressed over 40 security vulnerabilities, including two that were reportedly exploited in the wild. CVE‑2025‑24200, a flaw in the Accessibility features, could allow a malicious app to escape its sandbox. CVE‑2025‑24107 concerned a kernel memory leak that could expose sensitive data to a local attacker. The update also hardens the Transparency, Consent, and Control (TCC) framework, closing a loophole that allowed certain apps to silently harvest clipboard data. Safari patches prevent address bar spoofing attacks, and a WebRTC fix eliminates a potential IP leak when using iCloud Private Relay. Enterprise administrators gain new MDM restrictions to enforce FileVault recovery key escrow and limit Apple Intelligence features on managed devices.
Performance, Stability, and Bug Fixes
Beyond feature additions, 15.4 resolves numerous bugs that plagued earlier Sequoia releases. Users who experienced intermittent Wi‑Fi drops on M3 MacBook Air models will find the issue eliminated. The Bluetooth stack receives a rewrite that improves multi‑device audio switching, particularly when simultaneously using AirPods Pro and a Magic Keyboard with Touch ID. Graphics performance in pro apps like Final Cut Pro and Blender sees a 4–7% uplift on M1‑series chips thanks to updated Metal drivers. Memory leak issues in WindowServer that caused sluggish Mission Control animations after prolonged uptime have been fixed. Handoff between Mac and iPhone now works reliably even when Bluetooth is temporarily disabled. A niche but impactful correction addresses external display wake-from-sleep failures on the Mac mini with M4 Pro. All Macs compatible with Sequoia (2018 MacBook Air, 2017 MacBook Pro, 2018 Mac mini, 2019 iMac, iMac Pro, 2019 Mac Pro, and all Apple silicon models) receive identical stability improvements.
Should You Upgrade to macOS Sequoia 15.4?
Deciding whether to install immediately depends on your hardware profile, workflow dependencies, and tolerance for early-adopter quirks. Apple silicon Mac users who rely on Apple Intelligence features will find the expanded language support and Priority Notifications transformative. The feature set feels mature enough for daily productivity, especially if you operate in one of the newly added languages. Security-conscious users should factor in the active exploits patched; delaying leaves devices exposed to known vulnerabilities that are already circulating.
Creative professionals using legacy audio units, kernel extensions, or custom ColorSync profiles should proceed with caution. Several third‑party audio plugin developers have not yet certified full compatibility, and Rosetta 2 translation of older Intel‑only System Extensions requires an explicit approval gesture in Privacy & Security settings. Virtualization software like VMware Fusion and UTM received patches of their own within days, but snapshot compatibility with earlier macOS versions may break. If you rely on specific vertical software—medical imaging, industrial control, or niche scientific tools—check with the vendor before upgrading.
The update does not drop support for any Intel Mac model that previously ran Sequoia, but Intel machines do not gain Apple Intelligence features at all. For those users, the value proposition shrinks to security patches, Safari improvements, and bug fixes. Factor in that the installer size is approximately 5.8 GB and requires a restart with up to 30 minutes of downtime.
For the vast majority, macOS Sequoia 15.4 is a polished, feature‑rich point release that pushes Apple Intelligence forward while delivering essential security hardening. Given the patched exploits, the upgrade is strongly recommended unless mission‑critical software conflicts absolutely forbid it. Before initiating the update, perform a full Time Machine backup, verify that your key applications are updated, and review any enterprise‑management policies that might defer installation.