iOS 27's hidden ModelDelegation API lets developers swap Siri's brain for Claude or GPT-5.6Terra
新智元 · wechat · 2026-09-14
Developers discovered that iOS 27/macOS 27 ship a hidden "ModelDelegation" API — Siri's "Ask…" menu shows a Claude option, though Apple hasn't announced it.
What developers got working
- A local background daemon forwards Siri requests to Claude's CLI and streams text/files/suggestions back with full context; the same CSV-table request that Siri can't do, Claude completes instantly
- Permissions stay with Apple: Claude understands "set a reminder" but must hand the request back to Siri, which alone can invoke AppIntents — third-party models get to "think," not act
- An extreme demo replaced Siri's server-side planner entirely with GPT-5.6Terra, which received Apple's native task-planning instructions and tool list; OpenAI's backend logged the real calls
Backstory
Per Gurman, Apple considered rebuilding Siri around Claude, but Anthropic priced it at billions/year doubling over three years; Apple signed Gemini instead ($1B/year). Net take: Siri becomes a "socket," and Apple aims to own the router position — models compete underneath, but contacts, calendars and device permissions never leave Apple's hands.
Related event: Hidden iOS 27 Hooks Let Developers Swap Siri's Backend for Claude(4 posts)→
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