Apple Releases Xcode 26.3 With Autonomous AI Agents, Claude 4.6 Support [Download]

Apple has released Xcode 26.3 to developers, introducing autonomous AI coding agents for the first time. The update is available now on the Mac App Store and integrates third-party AI models directly into the development environment.



A key addition in Xcode 26.3 is support for agentic coding. Rather than relying on traditional code completion that suggests text at the cursor, developers can now instruct Xcode to work autonomously toward broader goals. The system can break down complex tasks, make architectural decisions, and use built-in tools to execute changes. This capability is powered natively by Anthropic's Claude Agent and OpenAI's Codex.


Apple is not limiting developers to those two ecosystems. The release incorporates the Model Context Protocol, an open standard that allows programmers to bring compatible AI agents or tools directly into their Xcode workflow. To manage these integrations securely, Apple has implemented a detailed permissions system that gives users granular control over what AI tools can access or modify within their projects.

The final public release also includes refinements tested during the Release Candidate phase. Apple confirmed that Xcode 26.3 supports the recently launched Claude 4.6 model and upgrades Codex integration to version 0.98.0 for improved stability. The update resolves an issue where custom model providers could disappear between launches and fixes a crash tied to the "Generate a Fix" button in the Issues Navigator. Additional patches ensure externally configured server settings are not overwritten during initialization and that image files process correctly without error messages.

Apple did outline a few known issues with the new agentic tools. If a user denies Claude or Codex access to privacy-protected directories such as Desktop or Documents, the agent remains blocked from that location until permissions are manually adjusted in macOS System Settings. In addition, pasting files directly into the coding assistant interface may not reliably transmit their contents to the active agent, requiring developers to place files in a working directory instead.

Under the hood, Xcode 26.3 includes Swift 6.2.3 and the latest SDKs for iOS 26.2, iPadOS 26.2, tvOS 26.2, macOS 26.2, and visionOS 26.2. It supports on-device debugging for devices running iOS 15 or later, along with recent versions of tvOS, watchOS, and visionOS. A Mac running macOS Sequoia 15.6 or later is required to install the update.


While this version is now publicly available, Apple has already moved ahead by seeding Xcode 26.4 beta 2 to developers earlier this week.

You can download Xcode 26.3 from the Mac App Store at the link below.

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