Foundation Models フレームワーク：アプリのためのオンデバイス LLM セッション

import FoundationModels

// Check that Apple Intelligence and the on-device model are available first.
guard case .available = SystemLanguageModel.default.availability else { return }

let session = LanguageModelSession(instructions: "You are a concise assistant.")
let answer = try await session.respond(to: "Summarise this receipt in one sentence.")
print(answer.content)

// Guided generation: the model fills a Swift type instead of free text.
@Generable
struct Receipt {
    @Guide(description: "Merchant name") var merchant: String
    @Guide(description: "Total amount in the receipt currency") var total: Double
}
let receipt = try await session.respond(to: "Extract the merchant and total.", generating: Receipt.self).content

// WWDC26: any provider can back a session through the LanguageModel protocol.
let session = LanguageModelSession(model: SystemLanguageModel.default)          // on-device AFM 3 Core
// let session = LanguageModelSession(model: PrivateCloudComputeLanguageModel()) // Apple server models
// let session = LanguageModelSession(model: MLXLanguageModel(...))              // open-source local models
// Third-party cloud providers can conform to LanguageModel and plug in the same way.