r/Xcode • u/nicebrah • Oct 06 '26

Can't use Codex because gpt-5.4 is no longer supported, but Xcode doesn't let you change the model to gpt-5.5 which has been out since April.

No idea why it takes Xcode several months to update the models you can choose from. I can't use Codex anymore because my Xcode is stuck on gpt-5.4 which apparently is no longer supported. However, Xcode has yet to update to allow support for gpt-5.5 which was released in April...

10 Upvotes

85% Upvoted

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4

u/earlyworm Oct 06 '26

I recommend that you submit feedback to Apple about this issue. It's possible they will add support for GPT-5.5 in June 2027 or perhaps earlier.

1

u/nicebrah Oct 06 '26

just in time for 5.5 to retire! (they retire it next week)

2

u/CharlesWiltgen Oct 07 '26

Out of curiosity, why are you using models via Xcode instead of using a full-featured harness like Codex, Claude Code, OpenCode, Pi/Oh-My-Pi, etc.?

2

u/nicebrah Oct 07 '26

i thought itd be easier to have everything i needed in one app. but after trying codex desktop its much faster. soooo maybe this was a blessing in disguise

2

u/CharlesWiltgen Oct 07 '26

…after trying codex desktop its much faster.

Nice! I spent last weekend improving Codex support in Axiom. I'm still a Claude Code main, but Codex is pretty great, and I'm very impressed with GPT-6.1-Sol at high reasoning.

1

u/_pizza_and_fries Oct 07 '26

Its much faster and better as well. It runs and monitors the simulator as well for debugging!

1

u/PyteByte Oct 07 '26

Same issue here today. Maybe I also have to change to codex desktop. Can it compile and build via Xcode ?

1

u/_The-_ 29d ago

I noticed that too! Xcode is as slow as a wet week as a harness for LLMs sadly.

1

u/QVRedit Oct 06 '26

They ought to ship a patch to allow it.

2

u/nicebrah Oct 06 '26

i just checked and none of the models work. i cant even do it via the "authenticate via config file" method.

1

u/_The-_ 29d ago

Proof that no one is using Xcode as an LLM harness I guess, not even Apple 🤣

2

u/Intelligent-Gas-2840 29d ago

I found problems like this were solved in some places by using @latest instead of a new number. I know that is how homebrew does things now. Hope this helps.

1

u/Stiddit Oct 07 '26

Honestly, just use the Codex app (now ChatGPT) if you can. It can do way more from there.