MacOS Tahoe 26.3 & 26.4 Beta Images Now Available

We're excited to announce two new image updates for our GitHub runners: macOS Tahoe 26.3 with Xcode 26.3 RC2 and macOS Tahoe 26.4 Beta with Xcode 26.4 Beta. Both images are available today across all GetMac plans.

macOS Tahoe 26.3 (Stable)

Apple released macOS Tahoe 26.3 on February 11, 2026, and we've updated our runners to match. While this isn't a major feature release, it brings important improvements for CI/CD stability:

• Security patches — Fixes across WebKit, dyld, and other core components, including a patch for what Apple describes as an "extremely sophisticated" targeted attack vector.
• Liquid Glass UI fixes — Improved window resize hit areas that now follow corner radius, and restored Finder column resizing in Column View.
• M5 Pro/Max optimization — Performance tuning for the latest Apple Silicon chips.

Xcode 26.3 RC2

This is the headline update for developers. Xcode 26.3 RC2 (Build 17C528) ships with:

• Agentic coding — Xcode 26.3 introduces agents that autonomously navigate your project, modify files, run builds and tests, and use Xcode Previews to validate UI. AI agents from Anthropic (Claude) and OpenAI can carry out multi-step coding, debugging, and testing workflows directly inside Xcode.
• Swift 6.2.3 — The latest Swift compiler with bug fixes and performance improvements.
• Updated SDKs — iOS 26.2, iPadOS 26.2, macOS 26.2, tvOS 26.2, and visionOS 26.2 SDKs included.

macOS Tahoe 26.4 Beta

For teams that want to test against upcoming OS changes, we now offer macOS Tahoe 26.4 Beta with Xcode 26.4 Beta. Key changes in this beta:

• Battery Charge Limit — New system setting to cap maximum charge between 80-100%.
• Safari Compact Tab Bar — The compact tab bar option returns to System Settings.
• Rosetta 2 deprecation warnings — New popups warn when launching Rosetta-translated apps, signaling that macOS 26 is the last release supporting Intel apps.
• Early Siri and emoji updates — Expected to land in later betas of the 26.4 cycle.

Xcode 26.4 Beta

Xcode 26.4 Beta (Build 17E5159k) ships alongside macOS 26.4 Beta and includes:

• AI coding agents — Autonomous agents that can build, test, and fix compilation errors without constant developer prompting. Supports ChatGPT models (GPT-4.1, GPT-5), Anthropic Claude Sonnet 4, and custom local models via API keys.
• Privacy usage descriptions — Automatic identification of missing privacy usage descriptions with a direct "Add" button linking to Signing & Capabilities settings, saving hours of debugging.
• Explicitly Built Modules — Now the default for C and Objective-C code, improving build reliability and debugging speed. Swift support remains experimental.
• Updated SDKs — iOS 26.4, iPadOS 26.4, macOS 26.4, tvOS 26.4, and visionOS 26.4 beta SDKs included.

GitHub Actions Integration

Use the following labels in your runs-on field:

• getmac-tahoe or getmac-latest — macOS Tahoe 26.3 with Xcode 26.3 RC2
• getmac-tahoe-beta — macOS Tahoe 26.4 Beta with Xcode 26.4 Beta

- runs-on: macos-latest
+ runs-on: getmac-tahoe

For the full list of available labels, see our Workflow Labels documentation. For a complete breakdown of pre-installed tools, simulators, and SDKs, check out the Installed Tools & Libraries page.

Get Started

Both images are live now. Update your workflow labels and your next run will pick up the new images automatically.

As always, we'd love to hear your feedback — join our Discord community to share thoughts or request new tools.

— The GetMac Team