Streaming chat completions in plain Swift with URLSession.bytes (no SDK)

Most LLM APIs now speak the same "OpenAI-style" HTTP protocol. You don't need a package for it: URLSession.bytes(for:) plus AsyncLineSequence handles the server-sent-event stream in about 40 lines. Here is the version I keep reusing (macOS 12 / iOS 15+). import Foundation struct ChatRequest: Encodable { struct Message: Encodable { let role: String; let content: String } let model: String let stream: Bool let messages: [Message] } struct ChatChunk: Decodable { struct Choice...