Back in February or March, the new Xcode's agentic features completely changed how I used Apple's coding intelligence features. But obviously they limited the agent mode to work with Claude or Codex only. I have a GLM Code subscription and really like using GLM-5.1 in Cursor, but you couldn't in Xcode at first.

On GH there's an open-source tool that let me add my Z API key and now I can use GLM-5.1 in Xcode Agent Mode directly. I've used 10 million tokens today and it seriously works just as well as Opus 4.5, imo. Just a PSA.