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Spezi LLM

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Overview

The Spezi LLM Swift Package includes modules that are helpful to integrate LLM-related functionality in your application. The package provides all necessary tools for local LLM execution, the usage of remote OpenAI-based LLMs, as well as LLMs running on Fog node resources within the local network.

Setup

1. Add Spezi LLM as a Dependency

You need to add the SpeziLLM Swift package to your app in Xcode or Swift package.

Important

If your application is not yet configured to use Spezi, follow the Spezi setup article to set up the core Spezi infrastructure.

2. Follow the setup steps of the individual targets

As Spezi LLM contains a variety of different targets for specific LLM functionalities, please follow the additional setup guide in the respective target section of this README.

Targets

Spezi LLM provides a number of targets to help developers integrate LLMs in their Spezi-based applications:

The section below highlights the setup and basic use of the SpeziLLMLocal, SpeziLLMOpenAI, and SpeziLLMFog targets in order to integrate Language Models in a Spezi-based application.

Note

To learn more about the usage of the individual targets, please refer to the DocC documentation of the package.

Spezi LLM Local

The target enables developers to easily execute medium-size Language Models (LLMs) locally on-device. The module allows you to interact with the locally run LLM via purely Swift-based APIs, no interaction with low-level code is necessary, building on top of the infrastructure of the SpeziLLM target.

Important

Spezi LLM Local is not compatible with simulators. The underlying mlx-swift requires a modern Metal MTLGPUFamily and the simulator does not provide that.

Important

To use the LLM local target, some LLMs require adding the Increase Memory Limit entitlement to the project.

Setup

You can configure the Spezi Local LLM execution within the typical SpeziAppDelegate. In the example below, the LLMRunner from the SpeziLLM target which is responsible for providing LLM functionality within the Spezi ecosystem is configured with the LLMLocalPlatform from the SpeziLLMLocal target. This prepares the LLMRunner to locally execute Language Models.

class TestAppDelegate: SpeziAppDelegate {
    override var configuration: Configuration {
        Configuration {
            LLMRunner {
                LLMLocalPlatform()
            }
        }
    }
}

SpeziLLMLocalDownload can be used to download an LLM from HuggingFace and save it on the device for execution. The LLMLocalDownloadView provides an out-of-the-box onboarding view for downloading models locally.

struct LLMLocalOnboardingDownloadView: View {
    var body: some View {
        LLMLocalDownloadView(
            model: .llama3_8B_4bit,
            downloadDescription: "The Llama3 8B model will be downloaded",
        ) {
            // Action to perform after the model is downloaded and the user presses the next button.
        }
    }
}

Tip

The LLMLocalDownloadView view can be included in your onboarding process using SpeziOnboarding as demonstrated in this example.

Usage

The code example below showcases the interaction with local LLMs through the the SpeziLLM LLMRunner, which is injected into the SwiftUI Environment via the Configuration shown above.

The LLMLocalSchema defines the type and configurations of the to-be-executed LLMLocalSession. This transformation is done via the LLMRunner that uses the LLMLocalPlatform. The inference via LLMLocalSession/generate() returns an AsyncThrowingStream that yields all generated String pieces.

struct LLMLocalDemoView: View {
    @Environment(LLMRunner.self) var runner
    @State var responseText = ""

    var body: some View {
        Text(responseText)
            .task {
                // Instantiate the `LLMLocalSchema` to an `LLMLocalSession` via the `LLMRunner`.
                let llmSession: LLMLocalSession = runner(
                    with: LLMLocalSchema(
                        model: .llama3_8B_4bit,
                    )
                )

                do {
                    for try await token in try await llmSession.generate() {
                        responseText.append(token)
                    }
                } catch {
                    // Handle errors here. E.g., you can use `ViewState` and `viewStateAlert` from SpeziViews.
                }
            }
    }
}

The LLMChatViewSchema can be used to easily create a conversational chat interface for your chatbot application with a local LLM.

struct LLMLocalChatView: View {
    var body: some View {
        LLMChatViewSchema(
            with: LLMLocalSchema(
                model: .llama3_8B_4bit
            )
        )
    }
}

Note

To learn more about the usage of SpeziLLMLocal, please refer to the comprehensive DocC documentation.

Spezi LLM Open AI

A module that allows you to interact with GPT-based Large Language Models (LLMs) from OpenAI within your Spezi application. SpeziLLMOpenAI provides a pure Swift-based API for interacting with the OpenAI GPT API, building on top of the infrastructure of the SpeziLLM target. In addition, SpeziLLMOpenAI provides developers with a declarative Domain Specific Language to utilize OpenAI function calling mechanism. This enables a structured, bidirectional, and reliable communication between the OpenAI LLMs and external tools, such as the Spezi ecosystem.

Setup

In order to use OpenAI LLMs within the Spezi ecosystem, the SpeziLLM LLMRunner needs to be initialized in the Spezi Configuration with the LLMOpenAIPlatform. Only after, the LLMRunner can be used for inference of OpenAI LLMs. See the SpeziLLM documentation for more details.

import Spezi
import SpeziLLM
import SpeziLLMOpenAI

class LLMOpenAIAppDelegate: SpeziAppDelegate {
    override var configuration: Configuration {
        Configuration {
            LLMRunner {
                LLMOpenAIPlatform()
            }
        }
    }
}

Important

If using SpeziLLMOpenAI on macOS, ensure to add the Keychain Access Groups entitlement to the enclosing Xcode project via PROJECT_NAME > Signing&Capabilities > + Capability. The array of keychain groups can be left empty, only the base entitlement is required.

Usage

The code example below showcases the interaction with an OpenAI LLM through the the SpeziLLM LLMRunner, which is injected into the SwiftUI Environment via the Configuration shown above.

The LLMOpenAISchema defines the type and configurations of the to-be-executed LLMOpenAISession. This transformation is done via the LLMRunner that uses the LLMOpenAIPlatform. The inference via LLMOpenAISession/generate() returns an AsyncThrowingStream that yields all generated String pieces.

8000 
import SpeziLLM
import SpeziLLMOpenAI
import SwiftUI

struct LLMOpenAIDemoView: View {
    @Environment(LLMRunner.self) var runner
    @State var responseText = ""

    var body: some View {
        Text(responseText)
            .task {
                // Instantiate the `LLMOpenAISchema` to an `LLMOpenAISession` via the `LLMRunner`.
                let llmSession: LLMOpenAISession = runner(
                    with: LLMOpenAISchema(
                        parameters: .init(
                            modelType: .gpt4o,
                            systemPrompt: "You're a helpful assistant that answers questions from users.",
                            overwritingToken: "abc123"
                        )
                    )
                )

                do {
                    for try await token in try await llmSession.generate() {
                        responseText.append(token)
                    }
                } catch {
                    // Handle errors here. E.g., you can use `ViewState` and `viewStateAlert` from SpeziViews.
                }
            }
    }
}

Note

To learn more about the usage of SpeziLLMOpenAI, please refer to the DocC documentation.

Spezi LLM Fog

The SpeziLLMFog target enables you to use LLMs running on Fog node computing resources within the local network. The fog nodes advertise their services via mDNS, enabling clients to discover all fog nodes serving a specific host within the local network. SpeziLLMFog then dispatches LLM inference jobs dynamically to a random fog node within the local network and streams the response to surface it to the user.

Important

SpeziLLMFog requires a SpeziLLMFogNode within the local network hosted on some computing resource that actually performs the inference requests. SpeziLLMFog provides the SpeziLLMFogNode Docker-based package that enables an easy setup of these fog nodes. See the FogNode directory on the root level of the SPM package as well as the respective README.md for more details.

Important

SpeziLLMFog performs dynamic discovery of available fog node services in the local network using Bonjour. To enable this functionality, the consuming application must configure the following Info.plist entries:

  • NSLocalNetworkUsageDescription (String): A description explaining why the app requires access to the local network. For example: "This app uses local network access to discover nearby services."
  • NSBonjourServices (Array<String>): Specifies the Bonjour service types the app is allowed to discover. For use with SpeziLLMFog, include the following entry:
    • _https._tcp (for discovering secured services via TLS)
    • _http._tcp (optional, for testing purposes only; discovers unsecured services)

Setup

In order to use Fog LLMs within the Spezi ecosystem, the SpeziLLM LLMRunner needs to be initialized in the Spezi Configuration with the LLMFogPlatform. Only after, the LLMRunner can be used for inference with Fog LLMs. See the SpeziLLM documentation for more details. The LLMFogPlatform needs to be initialized with the custom root CA certificate that was used to sign the fog node web service certificate (see the FogNode/README.md documentation for more information). Copy the root CA certificate from the fog node as resource to the application using SpeziLLMFog and use it to initialize the LLMFogPlatform within the Spezi Configuration.

class LLMFogAppDelegate: SpeziAppDelegate {
    private nonisolated static var caCertificateUrl: URL {
        // Return local file URL of root CA certificate in the `.crt` format
    }
    
    override var configuration: Configuration {
         Configuration {
             LLMRunner {
                // Set up the Fog platform with the custom CA certificate
                LLMRunner {
                    LLMFogPlatform(configuration: .init(connectionType: .http, authToken: .none))
                    // If required, specify `.https` connection type, including the certificate
                }
            }
        }
    }
}

In addition to set local network discovery entitlements described above, users must grant explicit authorization for local network access. This authorization can be requested during the app’s onboarding process using LLMFogDiscoveryAuthorizationView. It informs users about the need for local network access, prompts them to grant it, and attempts to verify the access status (note: the OS does not expose this information). For detailed guidance on integrating the LLMFogDiscoveryAuthorizationView in an onboarding flow managed by [SpeziOnboarding](https://swiftpackageindex.com/stanfordspezi/spezionboarding), refer to the in-line documentation of the LLMFogDiscoveryAuthorizationView.

Usage

The code example below showcases the interaction with a Fog LLM through the the SpeziLLM LLMRunner, which is injected into the SwiftUI Environment via the Configuration shown above.

The LLMFogSchema defines the type and configurations of the to-be-executed LLMFogSession. This transformation is done via the LLMRunner that uses the LLMFogPlatform. The inference via LLMFogSession/generate() returns an AsyncThrowingStream that yields all generated String pieces. The LLMFogSession automatically discovers all available LLM fog nodes within the local network upon setup and the dispatches the LLM inference jobs to the fog computing resource, streaming back the response and surfaces it to the user.

Important

The LLMFogSchema accepts a closure that returns an authorization token that is passed with every request to the Fog node in the Bearer HTTP field via the LLMFogParameters/init(modelType:overwritingAuthToken:systemPrompt:). The token is created via the closure upon every LLM inference request, as the LLMFogSession may be long lasting and the token could therefore expire. Ensure that the closure appropriately caches the token in order to prevent unnecessary token refresh roundtrips to external systems.

struct LLMFogDemoView: View {
    @Environment(LLMRunner.self) var runner
    @State var responseText = ""

    var body: some View {
        Text(responseText)
            .task {
                // Instantiate the `LLMFogSchema` to an `LLMFogSession` via the `LLMRunner`.
                let llmSession: LLMFogSession = runner(
                    with: LLMFogSchema(
                        parameters: .init(
                            modelType: .llama7B,
                            overwritingAuthToken: .none,    // potentially overwrite default auth token from `LLMFogPlatform`
                            systemPrompt: "You're a helpful assistant that answers questions from users."
                        )
                    )
                )

                do {
                    for try await token in try await llmSession.generate() {
                        responseText.append(token)
                    }
                } catch {
                    // Handle errors here. E.g., you can use `ViewState` and `viewStateAlert` from SpeziViews.
                }
            }
    }
}

Note

To learn more about the usage of SpeziLLMFog, please refer to the DocC documentation.

Contributing

Contributions to this project are welcome. Please make sure to read the contribution guidelines and the contributor covenant code of conduct first.

License

This project is licensed under the MIT License. See Licenses for more information.

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About

Large Language Model (LLM) module for the Spezi Ecosystem

swiftpackageindex.com/StanfordSpezi/SpeziLLM/documentation

Topics

swift ios chatbot openai gpt swiftui large-language-models llm spezi

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Jun 5, 2025
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Screenshot displaying the Chat View utilizing the OpenAI API from SpeziLLMOpenAI. Screenshot displaying the Local LLM Download View from SpeziLLMLocalDownload. Screenshot displaying the Chat View utilizing a locally executed LLM via SpeziLLMLocal.
OpenAI LLM Chat View Language Model Download Local LLM Chat View