iOS 27 ships hidden hooks to replace Siri's model with Claude or GPT
A researcher found two dormant frameworks in the shipping OS: one adds a model to Siri's Ask menu, the other lets it replace Siri outright. DMA forced it.
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Two hooks, not one
Model Delegation slots a third-party model into Siri's ‘Ask…’ menu as an extension — it answers, then hands system tasks like reminders or file creation back to Siri. The Inference Provider Protocol goes further and swaps Apple's server-side Siri model wholesale.
The replacement gets Siri's keys
A model plugged in via Inference Provider receives Apple's own Siri planner prompt and tool definitions, can request user data, and can make tool calls that change System Settings — the same access level as Apple's Private Cloud Compute.
Shipping, but switched off
The frameworks are in the iOS 27 and macOS 27 release candidates, but Apple hasn't opened the delegation entitlement to any outside developer. Only Apple's built-in ChatGPT ‘Ask…’ extension is live today — so there's nothing to build against yet.
The reason is regulation
The design maps to the EU's Digital Markets Act, which requires Apple give third parties the same access to iOS features its own services use. The plumbing exists because Brussels forced it open, not because Apple chose to.
What it means for you
Once the entitlement flips, the path for Claude or GPT to become the assistant on an iPhone — planner, tools and all — is already wired. Anthropic and OpenAI are the likely first tenants; independent inference providers would be the next domino.