I have an iOS app, "Spatial Agents" which ran great in 26.3. It creates dashboards around a topic. It can also decompose a topic into sub-topics, and explore those. All based on web articles and web article headlines. In iOS 26.4 almost every topic - even "MIT Innovation" are rejected with an apology of "I apologize I can not fulfill this request". I've tried softening all my prompts, and I can get only really benign very simple topics to respond, but not anything with any significance. It ran great on lots of topics in 26.3. My published App, is now useless, and all my users are unhappy. HELP!

I am excited to try Foundation Models during WWDC, but it doesn't work at all for me. When running on my iPad Pro M4 with iPadOS 26 seed 1, I get the following error even when running the simplest query: let prompt = "How are you?" let stream = session.streamResponse(to: prompt) for try await partial in stream { self.answer = partial self.resultString = partial } In the Xcode console, I see the following error: assetsUnavailable(FoundationModels.LanguageModelSession.GenerationError.Context(debugDescription: "Model is unavailable", underlyingErrors: [])) I have verified that Apple Intelligence is enabled on my iPad. Any tips on how can I get it working? I have also submitted this feedback: FB17896752

In the name of God, please allow initializing GeneratedContent from an array of key-value pairs. It’s literally the same thing KeyValuePairs uses internally, but it would let us initialize structure-like GeneratedContent from dynamic data without resorting to unsafeBitCast hacks.

In working with Apple's foundation models, we often want to provide as much context as possible. However, since the model has a context size limit of 4096 tokens, is there a way to estimate the number of tokens beforehand?

Hello, is it allowed to use Foundation Model Framework in submission app for WWDC26? The thing is that Apple Intelligence needs to be enabled in the settings. So, does that mean the jury won't be able to fully utilize the app's AI functionality?

Hi, I am developing an iOS application that utilizes Apple’s Foundation Models to perform certain summarization tasks. I would like to understand whether user data is transferred to Private Cloud Compute (PCC) in cases where the computation cannot be performed entirely on-device. This information is critical for our internal security and compliance reviews. I would appreciate your clarification on this matter. Thank you.

FoundationModels framework, macOS Tahoe 26.4.1, MacBook Air M4. Loading a LoRA adapter via SystemLanguageModel.Adapter(fileURL:) leaks ~100MB of APFS disk space per invocation. The space is permanently consumed at the APFS block level with no corresponding file. Calls without an adapter show zero space loss. Running ~300 adapter calls in a benchmark loop leaked ~30GB and nearly filled a 500GB drive. The total unrecoverable phantom space is now ~239GB (461GB allocated on Data volume, 222GB visible to du). Reproduction: Build a CLI tool that loads a .fmadapter and runs one generation Measure before/after with df and du: Before: df free = 9.1 GB, du -smx /System/Volumes/Data = 227,519 MB After: df free = 9.0 GB, du -smx /System/Volumes/Data = 227,529 MB df delta: ~100 MB consumed du delta: +10 MB (background system activity) Phantom: ~90 MB -- no corresponding file anywhere on disk Without --adapter (same code, same model): zero space change du was run with sudo -x. Files modified during the call were checked with sudo find -mmin -10 -- only Spotlight DBs, diagnostics logs, and a 7MB InferenceProviderService vocab cache. Nothing accounts for the ~90MB loss. fs_usage shows TGOnDeviceInferenceProviderService writing hundreds of APFS metadata blocks (RdMeta on /dev/disk3) per adapter call. Recovery Mode diagnostics: fsck_apfs -o -y -s: no overallocations, bitmap consistent (118.6M blocks counted = spaceman allocated) fsck_apfs -o -y -T -s: B-tree repair found nothing fsck_apfs -o -y -T -F -s: "error: container keybag (39003576+1): failed to get keybag data: Inappropriate file type or format. Encryption key structures are invalid." No fsck_apfs flag combination reclaims the space. The leaked blocks are validly allocated in the APFS bitmap and referenced in the extent tree, but not associated with any file visible to du, find, stat, or lsof. Has anyone else observed space loss when using SystemLanguageModel.Adapter? If I am missing something obvious, I would love to know.

I'm experimenting with using the Foundation Models framework to do news summarization in an RSS app but I'm finding that a lot of articles are getting kicked back with a vague message about guardrails. This seems really common with political news but we're talking mainstream stuff, i.e. Politico, etc. If the models are this restrictive, this will be tough to use. Is this intended? FB17904424

Hi, I just upgraded my macOS with beta 2. After upgrade, the SwiftTranscriptionSampleApp it's stopped working, in Xcode console I read: "The connection to service named com.apple.modelcatalog.catalog was invalidated: failed at lookup with error 159 - Sandbox restriction." Note: in beta 1 worked fine

Hi, I just upgraded to macOS Tahoe Beta 2 and now I'm getting this error when I try to initialize my Foundation Models' session: Error Resource (Local Sanitizer Asset) unavailable error. import FoundationModels #Playground { let session = LanguageModelSession() do { let result = try await session.respond(to: "Tell me 3 colors") print(result.content) } catch { print("Error", error) } } I couldn't find any resource guiding me on how to solve this. Any help/workaround? Thank you!

Whenever I try to initialize a LanguageModelSession (let session = LanguageModelSession()), my app crashes with EXC_BAD_ACCESS. SystemLanguageModel.default.availability returns available. I tried running the two sample projects I found that use Foundation Models, FoundationModelsTripPlanner and SwiftTranscriptionSampleApp, and they both also crash—immediately on launch. I commented out the Foundation Models logic from the SwiftTranscriptionSampleApp and ran it again, and it no longer crashed. I'm on macOS 26 Beta 4 on an M1 Pro device. I'm based in Austria (EU), if that matters.

Hello, I have created this basic swift program: let session = LanguageModelSession( model: .default, instructions: "bla bla bla.") I want to understand what I can put in model parameter (instead of .default). How can I choose between on-device local model (.default I suppose) and apple private cloud model (or any other ?) Thanks

Hi all, I'm working on an app that utilizes the FoundationModels found in iOS 26. I updated my phone to iOS 26 beta 3 and am now receiving the following error when trying to run code that worked in beta 2: Al Error: The operation couldn't be completed. (FoundationModels.LanguageModelSession.Genera- tionError error 2.) I admit I'm a bit of a new developer, but any idea if this is an issue with beta 3 or work that I'll need to do to adapt my code to some changes in the AI API? Thank you!