---
title: "init(input:output:metadata:)"
framework: foundationmodels
role: symbol
role_heading: Initializer
platforms: [iOS 27.0+, iPadOS 27.0+, Mac Catalyst 27.0+, macOS 27.0+, visionOS 27.0+, watchOS 27.0+]
path: "foundationmodels/languagemodelexecutorgenerationchannel/usage/init(input:output:metadata:)"
---

# init(input:output:metadata:)

Creates a usage update.

## Declaration

```swift
init(input: LanguageModelExecutorGenerationChannel.Usage.Input, output: LanguageModelExecutorGenerationChannel.Usage.Output, metadata: [String : any Sendable & Codable & Equatable] = [:])
```

## Parameters

- `input`: Token counts for the transcript.
- `output`: Token counts for the response.