Apple, OpenAI, and Google all shift their AI assistants at once
In two days, Apple opened Siri to third-party AI defaults including Claude, OpenAI redesigned ChatGPT into an agentic superapp, and Google made Gemini 3.5 Flash the default model across Search and the Gemini app.
Score breakdown
Three simultaneous platform-level changes mean the default AI model behind Siri, ChatGPT, and Google Search all shifted within two days, opening new distribution channels for third-party AI providers and changing the underlying models developers may be calling in their stacks.
- 01Apple's rebuilt Siri runs on a custom 1.2-trillion-parameter Google Gemini model with a three-tier routing system (on-device, Private Cloud Compute, Google Cloud).
- 02iOS 27 lets users set Claude, ChatGPT, Gemini, or Grok as their default AI across Siri, Writing Tools, and Image Playground.
- 03Apple reportedly pays Google around one billion dollars a year for the Gemini model and anonymizes data before it reaches Google.
At WWDC 2026 — described as Tim Cook's final keynote — Apple unveiled a rebuilt Siri powered by a custom 1.2-trillion-parameter Google Gemini model. The new architecture uses a three-tier routing system: simple requests are handled on-device, more demanding ones go to Apple's Private Cloud Compute, and the heaviest workloads route to Google Cloud. Apple reportedly pays Google around one billion dollars a year for the model and anonymizes data before it reaches Google. Crucially for developers, iOS 27 allows users to set Claude, ChatGPT, Gemini, or Grok as their default AI across Siri, Writing Tools, and Image Playground — opening the phone's system-level assistant layer to third-party AI providers for the first time.
The post describes this as the realization of a May plan to unify ChatGPT, Codex, and the API.
OpenAI is simultaneously rolling out its largest ChatGPT redesign since launch, evolving the product from a question-and-answer tool into a superapp capable of taking actions on behalf of its roughly 900 million weekly users. A senior employee told the Financial Times that "Chat is dead." Agents can book travel, write code, and run multi-step tasks; third-party apps such as Canva and Booking run inside ChatGPT over MCP, with checkout handled via Stripe. The post describes this as the realization of a May plan to unify ChatGPT, Codex, and the API. Separately, Google made Gemini 3.5 Flash the default model for the Gemini app and AI Mode in Search globally, noting it is roughly four times faster than comparable models at lower cost. In Gemini Enterprise, the model is enabled by default and cannot be switched off.
Key facts
- 01Apple's rebuilt Siri runs on a custom 1.2-trillion-parameter Google Gemini model with a three-tier routing system (on-device, Private Cloud Compute, Google Cloud).
- 02iOS 27 lets users set Claude, ChatGPT, Gemini, or Grok as their default AI across Siri, Writing Tools, and Image Playground.
- 03Apple reportedly pays Google around one billion dollars a year for the Gemini model and anonymizes data before it reaches Google.
- 04OpenAI's ChatGPT redesign targets its ~900 million weekly users, adding agentic capabilities and third-party apps over MCP with Stripe checkout.
- 05A senior OpenAI employee told the Financial Times: "Chat is dead."
- 06Google made Gemini 3.5 Flash the global default for the Gemini app and AI Mode in Search, describing it as roughly four times faster than comparable models at lower cost.
- 07In Gemini Enterprise, Gemini 3.5 Flash is enabled by default and cannot be switched off.
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