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 use their API keys from other AI models, or run local models (if they’re using an Apple Silicon Mac).