Apple Siri Powered by Google Gemini: iOS 26.4 Confirmed
March 29, 2026 · 6 min read
TL;DR
Apple confirmed iOS 26.4 ships with Siri rebuilt on Google Gemini's 1.2-trillion-parameter model, replacing the failed Apple Intelligence LLM. The deal is reported at ~$1 billion per year. Apple's Private Cloud Compute architecture means Google cannot see your queries — queries run on Apple's PCC servers using stateless computation. New capabilities: on-screen awareness, multi-step task planning, conversational follow-ups. Timeline: iOS 26.4 (April) → iOS 26.5 (May) → full agentic Siri “Campos” in iOS 27 (September 2026).
Why Apple abandoned its own AI
Apple shipped Apple Intelligence with iOS 18 in 2024 with high expectations. It underdelivered on every dimension that mattered: multi-step reasoning, contextual task planning, and natural conversational follow-ups. The Apple Intelligence LLM routinely failed tasks that Claude, Gemini, and GPT-5 handled reliably. Siri's reputation, already damaged by years of mediocrity, worsened.
The internal decision to replace Apple Intelligence with a licensed model was reportedly made in late 2025. Apple evaluated both OpenAI's GPT-5 and Google Gemini before choosing Gemini — the determining factors were model capability, privacy architecture compatibility with Apple's Private Cloud Compute system, and commercial terms.
The deal mirrors Apple's existing search revenue share agreement with Google: Google pays Apple to be the default search engine. Now Apple pays Google approximately $1 billion per year to use Gemini as Siri's AI backbone — a stark reversal that reflects where AI infrastructure power currently sits.
Privacy architecture: why Google can't see your queries
The most technically significant aspect of the arrangement is Apple's Private Cloud Compute architecture. When your Siri request requires the Gemini model, it does not travel to Google's servers. Instead, it goes to Apple's PCC infrastructure where Google's model runs in a stateless, cryptographically attested environment.
Stateless computation
Each request is processed independently. The server has no memory of previous requests — it cannot build a profile of your queries over time, even within Apple's own infrastructure.
Cryptographic attestation
Your device cryptographically verifies that the cloud server is running only Apple-approved software before sending any data. If the server is running unauthorized code, your device refuses to connect.
No Google data access
The Gemini model weights run on Apple-controlled hardware. Google provides the model; Apple controls the execution environment. Google receives no user query data, no usage patterns, and no device information.
On-device first
Queries that don't require the large model are handled entirely on-device. Only complex reasoning tasks that exceed on-device model capability are sent to PCC.
What Gemini-powered Siri can do in iOS 26.4
On-screen awareness
Siri reads content currently visible on your screen. Point at a restaurant menu and ask 'what's vegetarian here?' — Siri reads the menu and answers. No need to describe what you're looking at.
Multi-step task planning
Request a chain of actions as one instruction: 'Find the email from Sarah, summarize it, create a calendar event for her proposed meeting time, and send her a confirmation.' Siri plans and executes the sequence.
Conversational follow-ups
Siri maintains context across follow-up questions reliably — not just for two turns, but for extended multi-turn conversations about a topic, task, or document.
App Intents expansion
Third-party apps can define App Intents that Siri can execute natively — not just launch the app, but complete specific actions inside it through the Siri interface.
Cross-app context
Siri remembers what you were doing when you switch apps. Working in Notes and switch to Mail? Siri can reference and act on the note content from your Mail context.
iOS 26 AI release timeline
iOS 18 (2024)
—Apple Intelligence launched
Apple shipped its own LLM for Siri. Underperformed on reasoning, multi-step tasks, and contextual awareness. ChatGPT integration added as fallback via OpenAI partnership.
Late 2025
—Apple explores Gemini licensing
Reports emerge of Apple negotiations with Google to license Gemini as Siri's backend. Apple Intelligence LLM quietly deprioritized in internal engineering.
Early 2026
—Deal finalized (~$1B/year)
Apple-Google Gemini deal confirmed at approximately $1 billion per year. Google Gemini 1.2-trillion-parameter model selected. Privacy architecture using Private Cloud Compute designed.
iOS 26.4 (March–April 2026)
—Gemini-powered Siri ships
On-screen awareness, multi-step planning, improved natural language follow-ups, App Intents expansion. Siri rebuilt on Gemini running through Apple's PCC infrastructure.
iOS 26.5 (May 2026)
—Third-party App Intents expansion
Developer-defined App Intents rolled out more broadly. Siri can take actions in significantly more third-party apps. Cross-app context improved.
iOS 27 (September 2026)
—Full agentic Siri ('Campos')
Persistent memory across sessions. Autonomous multi-app task completion. Background agent permissions for completing tasks without active user interaction. Full agentic platform.
What this means for AI assistant competition
Apple's pivot to Gemini does not make Siri a ChatGPT or Claude competitor overnight. iOS 26.4 ships meaningful improvements, but the full agentic Siri — persistent memory, autonomous multi-app task completion, background agents — doesn't arrive until iOS 27 in September 2026. Between now and then, Claude, ChatGPT, and Happycapy remain significantly more capable for complex, multi-step tasks.
The more significant implication is structural: Apple's 2.2 billion active device installed base is now a distribution channel for Google Gemini. Every iPhone user who uses Siri is effectively using Google's AI model — running through Apple's privacy infrastructure. This reshapes the competitive dynamics between AI labs and device platforms for the next several years.
Frequently asked questions
Is Apple replacing its AI with Google Gemini in iOS 26.4?
Yes. Apple confirmed that iOS 26.4 ships with a rebuilt Siri powered by Google Gemini's 1.2-trillion-parameter model. This replaces the failed Apple Intelligence large language model that Apple developed internally and shipped with iOS 18. The Apple Intelligence LLM underperformed on reasoning, multi-step planning, and contextual awareness compared to competing models — leading Apple to license Google Gemini as the backbone for Siri's AI capabilities. The deal is reported at approximately $1 billion per year, mirroring the structure of Apple's existing search deal with Google.
Will Google see my Siri queries in iOS 26.4?
No. Apple's Private Cloud Compute (PCC) architecture prevents Google from seeing your Siri queries. When Siri needs Gemini's capabilities, the query is processed through Apple's Private Cloud Compute servers, which use stateless computation — the server that processes your request cannot store or access your data across sessions. Cryptographic attestation proves to your device that the cloud server is running only Apple-approved software. Google's Gemini model runs on Apple's PCC infrastructure, not Google's servers. Apple retains full control over which queries reach cloud processing — on-device processing handles queries that don't require the large model.
What new features does Gemini-powered Siri add in iOS 26.4?
iOS 26.4 Gemini-powered Siri adds: on-screen awareness (Siri reads and acts on content currently visible on your screen without you describing it), multi-step task planning (Siri plans and executes sequences of actions across apps — set reminder, send message, book table — as one request), significantly improved natural language understanding (conversational follow-ups work reliably), App Intents expansion (Siri can take actions in third-party apps using developer-defined intents), and cross-app context (Siri remembers what you were doing in one app when you switch to another). These represent capabilities the Apple Intelligence LLM failed to deliver reliably.
When does iOS 26.4 with Gemini Siri release?
iOS 26.4 is scheduled for release in March–April 2026, shipping Gemini-powered Siri with on-screen awareness and multi-step planning. iOS 26.5 (May 2026) will add expanded third-party App Intents and improved cross-app context. iOS 27 (September 2026) is the full agentic Siri release — codenamed 'Campos' internally — with autonomous multi-app task completion, persistent memory across sessions, and deeper system-level permissions for background agent tasks.
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