WWDC 2026 - Apple Just Opened the Foundation Models Framework to Any LLM Provider

Until WWDC 2026, the Foundation Models framework had one rule: Apple's on-device model or nothing. That rule is gone. Session 339 introduces a public protocol layer that any LLM — a cloud API, an open-source local model, a fine-tune you host yourself — can implement. Once a provider ships a conforming Swift package, your existing LanguageModelSession code works with it unchanged. No rewrites. No new session abstractions. One line swap. This article is not a transcript summary. It explains the...