From Apple’s Xcode 26 Beta 7 release notes:

• Claude in Xcode is now available in the Intelligence settings panel, allowing users to seamlessly add their existing paid Claude account to Xcode and start using Claude Sonnet 4. (155826755)

• When using ChatGPT in Xcode, users can now start a new conversation with either GPT-4.1 or GPT-5, with GPT-5 set as the default. (158342780)

• ChatGPT in Xcode provides two model choices. “GPT-5” is optimized for quick, high-quality results, and should work well for most coding tasks. For difficult tasks, choose “GPT-5 (Reasoning)“, which spends more time thinking before responding, and can provide more accurate results for complex coding tasks.

  In the OpenAI API, “GPT-5” corresponds to the “minimal” reasoning level, and “GPT-5 (Reasoning)” corresponds to the “low” reasoning level. (159135374)

That’s just three weeks from the launch of ChatGPT 5 to shipping support in Xcode. Also, these are just the built-in integrations. As announced at WWDC, Xcode 26 allows developers to use their API keys from other AI providers, or connect to models running locally, on-device (if they’re using an Apple Silicon Mac).