Got it working with gpt-5.3-codex (via latest Codex binary)
Xcode 26.3 RC's Claude Code and Codex binaries can be updated manually to get latest improvements. Get access to Opus 4.6 (by updating settings.json) and GPT 5.3 Codex (with latest binary) without waiting for the next Xcode release. Here is a quick video showing exactly how: youtu.be/RwMPvH1LRz0
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