Overview
- ChatGPT in Xcode now defaults to OpenAI's GPT-5, with an option to switch to GPT-4.1.
- Two GPT-5 choices are available: a general model for speed and a 'GPT-5 (Reasoning)' variant for tougher coding tasks.
- Native Claude integration lets paid users sign in and use Claude Sonnet 4 from the Intelligence settings panel.
- Xcode 26 continues to support third-party API keys and running local models on Apple silicon Macs.
- Apple says the final Xcode 26 release will offer coding help from either ChatGPT or Claude inside the app.