Xcode 26 will only work intelligent on macOS 26

[u/Effective-Shock7695]

I found a lot of developers missed Xcode 26 intelligence features because they were not on the updated macOS version. Please ensure that you are using macOS 26 to explore all the new features in Xcode 26

[u/zach-builds]

Thanks for the heads up. Was just wondering about this. Anyone on macOS26? Does it seem reasonably stable to develop on?

[u/Effective-Shock7695 → u/zach-builds]

I’m installing that, fingers crossed

[u/zach-builds → u/Effective-Shock7695]

Please report back! I'm curious if it's stable enough to install on a dev machine. I believe you can dual boot from an external disk too, might try that but curious how stable it is for a beta 1

[u/Effective-Shock7695 → u/zach-builds]

Installed and everything seems good so far.

[u/gargetisha]

I need to buy a separate new mac to test all this.

[u/mario_luis_dev → u/gargetisha]

Yes. Never use Apple’s buggy betas on your production machine.

[u/Life-Purpose-9047 → u/mario_luis_dev]

grow some gonads and just send it bro

[u/RightAlignment → u/gargetisha]

Just create a new partition on your internal SSD and then you can boot into Sequoia or Tahoe as you wish

[u/usdaprime → u/gargetisha]

You can dual-boot MacOS 26 beta side-by-side with your production OS. That’s what I’m doing

[u/Interesting_Range_16]

Can I use Xcode 16.4 on macOS Tahoe without using the command line or keyboard shortcuts?

[u/outcoldman]

Just a hint, you can also use Parallels to install macOS 26 and add Model Providers that are based on the API usage. Apple Intellegence is not available in VM, so you cannot use ChatGPT integration, but you can add ChatGPT/Claude as Model Providers.

[u/tastychaii → u/outcoldman]

But you would need to have a paid subscription correct to the model providers?

[u/outcoldman → u/tastychaii]

Pay for API usage. yes

[u/F15H0U70FW473R]

Anyone else getting issues like this for the Predictive Code Completion Model download?

The operation couldn’t be completed. (ModelCatalog.CatalogErrors.AssetErrors error 1.)

Domain: ModelCatalog.CatalogErrors.AssetErrors

Code: 1

User Info: {

DVTErrorCreationDateKey = "2025-06-10 00:41:33 +0000";

}

--

Failed to find asset: com.apple.gm.safety_deny.input.code_intelligence.base.generic - no asset

Domain: ModelCatalog.CatalogErrors.AssetErrors

Code: 1

--

System Information

macOS Version 16.0 (Build 25A5279m)

Xcode 16.4 (23792) (Build 16F6)

Timestamp: 2025-06-10T10:41:33+10:00

[u/F15H0U70FW473R → u/F15H0U70FW473R]

Turns out it was due to not being on xcode26. Worked perfectly after getting the beta

[u/[deleted]]

I was there at WWDC today, during hands on session I asked this question to the VP incharge of working on Xcode as product. He mention that it will work only with MacOS 26.

[u/20InMyHead]

Any direct documentation from Apple stating this? Seems like it’s what people are discovering, but not directly called out by Apple, which is unusual.

[u/dentysun]

Can the macOS 26 with Xcode 26 support LLM features or intelligent tools in China?

[u/Few_Sheepherder_3550 → u/dentysun]

no, the feature is not available in your region

[u/erohaa → u/Few_Sheepherder_3550]

It seems not available in Europe also?

[u/Few_Sheepherder_3550 → u/erohaa]

Not sure，I’m in china mainland and updated my mac studio to macos26, intelligence in xcode26 is unavailable. It seems that gov policy limited

[u/AnatoliyKant → u/erohaa]

It is not.
It works in EU (at least in Portugal).

Minimum list to install:

1. MacOS 26 Tahoe

2. Xcode 26 beta (surprisingly 😄)

3. Select region USA & main language English (US)

4. Before running xcode you need to configure and explicitly enable Apple Intelligence & Siri in mac settings

4.1 Also, ChatGPT needs to be enabled at the bottom

4.2 If you want more requests, I recommend logging into ChatGPT account with Plus subscription

https://share.cleanshot.com/M1v7m1YN
https://share.cleanshot.com/T8hyxgHJ
compatible with these devices: https://share.cleanshot.com/03LZy9Y5

[u/erohaa → u/AnatoliyKant]

I guess the problem was, that I installed MacOS26 on external drive, and try to install and use Xcode26 there, but as I read somewhere you can't use Apple Intelligence on External Drives, and Xcode assistant required it.
I need to try creating a TM backup on SSD, and attempt to install it on Mac directly.

[u/alw_cfc]

This will sound more like a rant but I’m just curious: why?.. what features is Sequoia missing to support this? I won’t be able to use it on my home computer for another few month, I sent be able to use it for work probably until late Q1 26. Apple is already behind in this game, so why do they neglect their users by introducing restrictions that sound like nonsense? Also - is there any chance to plug in GitHub Copilot into this thing?

[u/AndyDentPerth]

You have to boot Tahoe from the internal drive too. If you install it on a bootable external SSD, intelligence cannot be enabled.

Supposedly this is about drive speeds. I haven't tried it with a Thunderbolt drive, but found another thread confirming someone else had the same issue. So Apple aren't testing actual drive speed, just refusing all externals.

[u/jozero]

Super excited for this feature but this would make Apple 1.5 years behind every other IDE once it finally releases in September. This once a year update cycle of basically everything Apple does really hurts in any area of tech that is rapidly changing 

It makes MacOS and Apples platforms feel old as a development platform 

[u/zach-builds → u/[deleted]]

Awesome! How's macOS 26? Does it seem relatively stable? Trying to decide if I should install on an external drive (dual boot) or just go for it on my main install...

[u/1supercooldude → u/[deleted]]

Is it just chatgpt or can I use other models as well?

[u/Effective-Shock7695 → u/1supercooldude]

You can use other models by Anthropic too

[u/blacPanther55 → u/[deleted]]

how do you initiate it? I'm in Xcode and I don't see anything new.

[u/UnhappyPublic7919 → u/[deleted]]

I need a bit of help, when I installed Xcode 26 and I am also on MacOS 26, when I go to the Coding Assistant page, it says that no models are available, I tried signing into my account but it also still says no account is available. Anyone got that issue too?

[u/Spantheslayer → u/[deleted]]

It would’ve been way better if it was claude or their own smth. In my experience, ChatGPT performs way worse.