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Apple Said to Rebuild Siri on a 1.2-Trillion-Parameter Gemini Model Ahead of WWDC

June 7, 2026 at 08:14 EDT

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Ahead of WWDC 2026 on June 8, Apple is expected to unveil a sweeping overhaul of its long-struggling Siri assistant. According to multiple reports, the new Siri will be rebuilt around a custom model based on Google's Gemini, said to be roughly 1.2 trillion parameters — what many see as Apple's most important AI moment yet.

June 8, 2026 · WWDC · Apple × Google

Siri's New Brain: a 1.2-Trillion-Parameter Gemini

Apple is expected to rebuild its long-criticized assistant around a custom Google-developed Gemini model — leaning on an outside large model for the first time. As of the eve of the keynote, every spec rests on reports and leaks; nothing is official.

1.2T

parameters in the custom Gemini model (likely MoE)

~$1B

per year, multi-year deal (≈¥150B)

2B+

Apple devices intended to reach

An 8× leap in model scale

Same unit (parameters) — bars drawn to scale.

Apple's prior cloud model
~150B

Custom Gemini for Siri
~1.2T

8× larger

How the new Siri is wired

Engine

Gemini powers Siri's summarizer & planner

→

Runs on

Apple's Private Cloud Compute

→

Privacy claim

No user data passed to Google

Anticipation

Siri may finally catch up to rivals
Gemini's knowledge breadth promises big gains
Onscreen awareness, personal context, web search

Skepticism

Proof Apple couldn't build it alone
Is privacy safe under Google dependence?
On-device seems hard at 1.2T parameters
~$250M settlement over earlier Siri delays

The watchpoint: the Gemini-backed Siri is expected to debut with iOS 27 within 2026 — even as Apple develops its own "Baltra" chip in parallel, hinting at a possible future return to in-house models.

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