Apple releases Xcode 26.3 with support for coding agents from OpenAI and Anthropic

Xcode 26.3 is now available as a release candidate for all members of the Apple Developer Program, with this version shipping with a powerful feature that lets you use Codex and Claude Agent directly inside the IDE:

Expanding on the intelligence features introduced in Xcode 26, which brought a brand-new coding assistant for writing and editing in Swift, this release gives coding agents access to even more of Xcode’s capabilities

Claude Agent and Codex are AI agents that are capable of understanding context, planning multi-step tasks, and executing them. Codex, built on OpenAI's GPT models, can function as an autonomous coding agent that understands codebase structure, generates documentation, suggests optimizations, and even acts as a 24/7 code reviewer that hunts for high-impact bugs.

Claude Agent, on the other hand, utilizes Anthropic's "Agent Skills Framework" to give Claude specific expertise and tools, allowing it to perform complex tasks like generating spreadsheets or fixing bugs with its Code Execution Tool.

Xcode is also integrating support for the Model Context Protocol (MCP), an open standard introduced by Anthropic in late 2024 to standardize how AI models connect to external systems. In other words, MCP acts as a universal adapter that allows AI applications to plug into different data sources, APIs, and tools without needing a custom-built connection for every single one.

Xcode began including support for large language models with the announcement of Xcode 26 last June. This initial version introduced automatic programming and chat query tools, with ChatGPT as the default model, while also supporting the integration of both local and cloud-based models from other providers through API keys.

Speaking of LLMs, Apple recently announced a new partnership with Google, the makers of Gemini, to use its models to power the next generation of Siri. This came after Apple reportedly failed to bring the advanced Siri it unveiled at WWDC 2024 to life using its own in-house models.

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Posted Wednesday 4 February 2026 at 12:13 pm AEST (my time).

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