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# Swift AI SDK
[](LICENSE)
[](https://github.com/teunlao/swift-ai-sdk/releases)
[](https://swift-ai-sdk-docs.vercel.app)
[](https://swiftpackageindex.com/teunlao/swift-ai-sdk)
[](https://swiftpackageindex.com/teunlao/swift-ai-sdk)
A unified AI SDK for Swift: streaming chat/completions, structured outputs, tool/function/MCP calling, and middleware — with 33+ providers via one API (OpenAI, Anthropic, Google, Groq, xAI, Vercel, TogetherAI, and more). Based on the [Vercel AI SDK](https://github.com/vercel/ai) with a focus on full API parity.
**[Documentation](https://swift-ai-sdk-docs.vercel.app)** | **[Getting Started](https://swift-ai-sdk-docs.vercel.app/getting-started/ios-macos-quickstart)** | **[Examples](examples/)** | **[Discussions](https://github.com/teunlao/swift-ai-sdk/discussions)**
## Features
- Streaming and non-streaming text generation
- Structured outputs (typed `Codable` + JSON Schema)
- Tool/function calling + MCP tools
- Provider-agnostic API (swap providers without changing call sites)
- Middleware hooks
- Experimental video generation
## Installation (SwiftPM)
Available on [Swift Package Index](https://swiftpackageindex.com/teunlao/swift-ai-sdk).
Add the package to your `Package.swift`:
```swift
// Package.swift
dependencies: [
// Use the latest release tag (e.g. "0.14.2").
.package(url: "https://github.com/teunlao/swift-ai-sdk.git", from: "0.14.2")
],
targets: [
.target(
name: "YourApp",
dependencies: [
.product(name: "SwiftAISDK", package: "swift-ai-sdk"),
.product(name: "OpenAIProvider", package: "swift-ai-sdk")
]
)
]
```
## Quickstart (Streaming)
Minimal text generation and streaming with OpenAI:
```swift
import SwiftAISDK
import OpenAIProvider
@main
struct Demo {
static func main() async throws {
// Set OPENAI_API_KEY in your environment (loaded lazily by the provider).
// Streaming text
let stream = try streamText(
model: openai("gpt-5"),
prompt: "Stream one sentence about structured outputs."
)
for try await delta in stream.textStream {
print(delta, terminator: "")
}
}
}
```
More examples (tools, structured output, middleware) are in the docs and `examples/`.
## Unified Provider Architecture
Switch providers without changing code — the function signature stays the same regardless of provider.
```swift
import SwiftAISDK
import OpenAIProvider
import AnthropicProvider
import GoogleProvider
let models: [LanguageModel] = [
openai("gpt-5"),
anthropic("claude-4.5-sonnet"),
google("gemini-2.5-pro")
]
for model in models {
let result = try await generateText(
model: model,
prompt: "Invent a new holiday and describe its traditions."
)
print(result.text)
}
```
## Structured Outputs (Typed `Codable`)
Generate structured data validated by JSON Schema or `Codable`.
Example: extract a release summary into a `Release` type using `Schema.codable`.
```swift
import SwiftAISDK
import OpenAIProvider
struct Release: Codable, Sendable {
let name: String
let version: String
let changes: [String]
}
let summary = try await generateObject(
model: openai("gpt-5"),
schema: Release.self,
schemaName: "release_summary",
prompt: "Summarize Swift AI SDK 0.1.0: streaming + tools."
).object
print("Release: \\(summary.name) (\\(summary.version))")
summary.changes.forEach { print("- \($0)") }
```
Notes: use `generateObjectNoSchema(...)` for raw `JSONValue`; arrays/enums via `generateObjectArray` / `generateObjectEnum`.
## Tools (Typed)
Models can call tools. Typed weather example:
```swift
import SwiftAISDK
import OpenAIProvider
import Foundation
struct WeatherQuery: Codable, Sendable {
let location: String
}
struct WeatherReport: Codable, Sendable {
let location: String
let temperatureFahrenheit: Int
}
let weatherTool = tool(
description: "Get the weather in a location",
inputSchema: WeatherQuery.self,
execute: { (query, _) in
WeatherReport(
location: query.location,
temperatureFahrenheit: Int.random(in: 62...82)
)
}
)
let result = try await generateText(
model: openai("gpt-4.1"),
tools: ["weather": weatherTool.tool],
prompt: "Use the weather tool to fetch the weather for San Francisco."
)
if let toolResult = result.toolResults.first {
let report = try weatherTool.decodeOutput(from: toolResult)
print(report)
}
```
Notes: `tool(...)` auto-generates schemas from `Codable` types. For streaming, use `streamText(..., tools: ...)` and consume `textStream`/`toolResults`.
## Providers
- Provider overview: https://swift-ai-sdk-docs.vercel.app/providers/overview
- Each provider lives in its own SwiftPM product (e.g. `OpenAIProvider`, `AnthropicProvider`, `GoogleProvider`).
## Upstream & Parity
This project ports the Vercel AI SDK with a focus on behavior/API parity.
- Upstream reference (pinned commit): `upstream/UPSTREAM.md`
## Contributing
Contributions welcome. See CONTRIBUTING.md for guidelines.
## License
Apache 2.0. Portions adapted from the Vercel AI SDK under Apache 2.0.
