Steve Troughton-SmithFeb 20

The RC 2 version of Xcode 26.3 does indeed distribute a new version of Codex that enables the gpt-5.3-codex model.

I would guess that's why they waited before publishing 26.3 to the App Store, and it also answers the question as to how their model update strategy might play out

Show threadDave ReedFeb 20
@stroughtonsmith does copying the codex or claude executable you can update via brew etc. into the appropriate subdirectory in -/Library/Developer/Xcode/CodingAssistant not allow you to update w/o an Xcode release. I thought I heard it did.
Show threadEytan Schulman

@davereed @stroughtonsmith Yes it does. Not sure about the way brew installs, I installed via Anthropic’s native Claude Code installer.

Running

cp `which claude` ~/Library/Developer/Xcode/CodingAssistant/Agents/Versions/26.3/claude

Gave me Opus 4.6 in Xcode 26.3, which it didn't do beforehand..

Feb 21 at 8:55amWeb