Claude for Foundation Models

Overview

Claude for Foundation Models is a Swift package from Anthropic that lets you use Claude as a server-side language model through Apple's Foundation Models framework. You create a ClaudeLanguageModel and use it with LanguageModelSession like any other Foundation Models provider. It's for app developers who want Claude's models behind Apple's standard API.

Features

• ClaudeLanguageModel plugs into LanguageModelSession
• Streaming responses with streamResponse(to:)
• Structured output with @Generable types
• Choice of Claude models, effort levels and fallbacks for declined requests
• App Attest authentication for production, or an API key for simulator development
• Per-user attribution through Anthropic user profiles

Requirements

• iOS 27, macOS 27, visionOS 27 or watchOS 27 (beta)
• Xcode 27 (beta)
• An App Attest client ID from the Anthropic console, or an API key for simulator development
• The bundled example needs a macOS 27 host

Install

1. Add the package to Package.swift, or use File > Add Package Dependencies in Xcode

   .package(url: "https://github.com/anthropics/ClaudeForFoundationModels.git", from: "0.1.0")

2. Import it alongside FoundationModels

   import FoundationModels
   import ClaudeForFoundationModels

Example

Create a ClaudeLanguageModel, pass it to a LanguageModelSession and ask it to "Plan a 4-day trip to Buenos Aires."