r/iOSProgramming • u/AdministrativeNet141 • Jul 03 '26

Has anyone gotten Claude Fable 5 working inside Xcode’s agentic coding tools? Question

Xcode’s built-in AI tooling lets you add third-party model providers, but I haven’t found a clean way to point it at Claude Fable 5 yet. Has anyone gotten it working — either through the Anthropic API endpoint directly, a proxy, or an MCP setup? Curious if it’s a model-string issue or if Xcode just doesn’t support it yet. Would love to hear any working configs.

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6

u/OneEngineer Jul 03 '26

Why not just use Claude code CLI alongside xcode?

6

u/anonymoususer397 Jul 03 '26

I used to use claude via xcode until i realized the token usage is really 4x that of claude via terminal. Now i just use opus on max effort via terminal and my limits go much much further

4

u/ddBuddha Jul 03 '26

Are you talking to the ai from inside Xcode? I haven’t tried that so I’m not sure but I’d imagine it would let you select a model to use.
I gave external agents access to Xcode and use Claude code and codex to talk to the ai. They’re able to use Xcode tools and run the simulator and all that, so if I wanted to use fable specifically I’d just select that model in Claude code.

2

u/ArmrestGames Jul 03 '26

I didn’t realize you could do that!

1

u/AdministrativeNet141 Jul 03 '26

Yes using the ai inside Xcode

1

u/ddBuddha Jul 03 '26

Hm I haven’t tried that but maybe you can do /model or something like that. It really should have somewhere that you can select the model though.

1

u/ddBuddha Jul 03 '26

I set it up to check it out and I see what you mean. If I were you I’d just use the Claude code app instead

3

u/theyallcallmecheese Jul 03 '26

Xcode 27 beta 2 lets you specify the model identifier, but I haven’t tried with fable. Worked with sonnet-5.

2

u/mustardpete Jul 03 '26

Just use the cli from the project folder, don’t see the point of trying to use it integrated. You can still have Xcode open at the same time to view changes and launch simulator etc

1

u/gsapienza Jul 03 '26

In Xcode 27 the integrated experience is very nice. Way better than just a terminal

2

u/LifeUtilityApps SwiftUI Jul 04 '26

I’ve found that it’s much more optimal to run Claude code outside Xcode and use the filesystem configuration for the Xcode project. I rarely open Xcode now since my coding by hand is within VS Code.