For 17 months, every iPhone running Apple Intelligence has had exactly one option for "smart" AI: send the question to ChatGPT, or do not get an answer. Apple set that arrangement up when iOS 18.2 shipped in December 2024, and it has held ever since. Even after Apple signed a 1 billion dollar a year contract with Google to put Gemini at the heart of Siri itself, ChatGPT remained the only outside chatbot iPhone users could actually call by name.
That ends in June.
Bloomberg's Mark Gurman, the longtime Apple beat reporter whose product leaks have been right more often than they have been wrong, reported on Tuesday that iOS 27, iPadOS 27, and macOS 27 will introduce a feature internally called Extensions. Once installed, the Claude app, the Grok app, the Gemini app, or any other AI-provider app that supports the new system can be set as the user's preferred model for Siri, Writing Tools, and Image Playground. The choice lives in a single toggle in Settings under Apple Intelligence & Siri.
Apple is testing Google's and Anthropic's integrations now. The full lineup will be announced at WWDC, which kicks off on June 8, 2026.
The Choice Becomes a Setting
The user-facing change is small to describe and large to use.
Today, when a user invokes Siri with a question Apple's on-device model cannot answer, the system asks "Do you want to use ChatGPT?" The flow assumes a single fallback partner. With Extensions, that flow becomes a normal preference, like a default browser or a default email client. Users install the AI app of their choice from the App Store, flip a switch in Settings, and from that moment on Siri, the Writing Tools popover, and Image Playground route eligible requests to that app.
Each provider also gets its own Siri voice. Per Bloomberg's reporting, queries answered by Apple's foundation models will speak in one voice; responses generated by a third-party model will speak in another. The intent, according to people Gurman spoke with at Apple, is that users always know which entity actually answered.
The architecture matters. Extensions is built on top of Apple's existing Google Gemini integration, which already powers core Siri intelligence under the $1 billion a year deal LDS covered when it was signed in January. Gemini, with its custom 1.2 trillion parameter model built for Apple, remains the default brain. Extensions adds a routing layer on top that lets users override which model handles the consumer-visible AI features.
What ML Practitioners Should Care About
For data scientists, ML engineers, and anyone building tools that run alongside or replace iPhone AI features, three changes in the new design have practical consequences.
Distribution becomes a flag, not a contract. Until iOS 27, getting an AI assistant onto an iPhone meant either signing an Apple Intelligence partnership (only OpenAI got one) or convincing users to leave Siri entirely and use a third-party app. Extensions removes the second wall. Anthropic, xAI, Mistral, DeepSeek, and any other provider with an iOS app can compete for the toggle. Whoever ships the best general-purpose model that quarter has a real shot at being the default for hundreds of millions of users.
Apple becomes a model-agnostic switchboard. Apple's responsibility shrinks to building the routing surface. The model quality, the prompt formatting, and the safety stack belong to the provider. For developers building enterprise or vertical AI tools on top of Siri Shortcuts and the Writing Tools API, this means the underlying model can change under their feet, and apps may need to handle different model behaviors gracefully.
Voice and persona become product features again. When every model speaks in its own voice, the differentiation stops being purely benchmark scores. Personality, tone, and audio quality will start to matter to consumer adoption in ways that have not mattered for chat-based AI since the original Siri launched.
The closest analog is the moment iOS allowed default browser switching. Safari did not stop existing. But Chrome and Firefox finally had a fair shot, and the competitive picture changed within a year.
How We Got Here
The iOS 27 timeline is the conclusion of a chain of moves that started 14 months ago.
| Date | Event |
|---|---|
| Dec 11, 2024 | iOS 18.2 ships with ChatGPT exclusive Siri integration |
| Aug 25, 2025 | xAI and X Corp file federal antitrust suit against Apple and OpenAI in Texas |
| Oct 1, 2025 | Apple files motion to dismiss; argues it "widely known" Apple intends to partner with other AI chatbots |
| Nov 14, 2025 | Judge Mark Pittman in Fort Worth allows xAI's antitrust case to proceed |
| Jan 13, 2026 | Apple announces Google Gemini as the primary intelligence behind Siri |
| Mar/Apr 2026 | iOS 26.4 ships with Gemini-powered Siri |
| May 5, 2026 | Bloomberg reports iOS 27 Extensions system, ending ChatGPT exclusivity |
| Jun 8, 2026 | WWDC keynote scheduled to formally unveil iOS 27 |
The August 2025 lawsuit is the engine that drove most of this. Musk's xAI alleged that the Apple-OpenAI exclusive deal, which embedded ChatGPT directly into Siri without requiring a separate app download, gave OpenAI an unrecoverable distribution advantage and unfairly suppressed Grok in App Store rankings. Apple's defense, filed in federal court in Texas in October 2025, included the line that "it is widely known that Apple intends to partner with other generative AI chatbots."
That filing, lawyers told reporters at the time, was a tell. Companies do not make legal commitments about future product behavior unless they are already planning the product. Seven months later, that filing now looks like the legal cover for the Extensions API that Bloomberg surfaced this week.
What This Costs OpenAI
For OpenAI, the change is a meaningful demotion. ChatGPT does not lose its iPhone presence. The existing Siri-to-ChatGPT integration, including the free-tier and ChatGPT Plus account linking, continues. What ends is the assumption that "iPhone AI" and "ChatGPT" are interchangeable.
OpenAI is also losing this distribution channel at an inconvenient moment. The company is preparing for an IPO, has just raised $122 billion in its most recent round with Amazon as a major partner, and is in the middle of a contentious split from Microsoft's exclusive cloud deal. iPhone exclusivity was one of the cleaner consumer-distribution moats OpenAI had. Losing it means competing for the Extensions toggle on equal footing, against Anthropic, Google, and possibly the same xAI that just sued to break the original arrangement.
For Anthropic, the change is one of the largest consumer distribution wins in the company's history. Claude has had paid Pro and Max tiers and a popular standalone app, but its center of gravity has been enterprise and developer tools. There is now a path to Claude being the named AI assistant on an iPhone, accessed by hundreds of millions of users who would otherwise never install the Claude app at all.
For xAI, the irony is sharper. Grok wins the right to compete on iOS in part because of a Musk lawsuit that Apple is still trying to settle. The same Musk who signed a SpaceX-Anthropic compute deal yesterday giving Claude 220,000 GPUs now gets a chance to put Grok directly on every iPhone shipping after WWDC.
The Other Side: Apple Intelligence Is Still Mostly Gemini
The Extensions framing has been criticized by some Apple watchers as overstating the openness of the new system.
Google's Gemini already holds a privileged native position inside Apple Intelligence, backed by the multi-year, roughly 1 billion dollar a year contract and an architecture in which Gemini powers the core personalized Siri experience and most on-device intelligence falls back to it. Claude and others enter as user-selected additions layered on top of that foundation. Extensions adds optionality. It does not flatten the existing hierarchy.
There is also the question of what Extensions actually exposes. Bloomberg's reporting describes the feature as routing requests for Siri, Writing Tools, and Image Playground. It does not describe a deeper integration where third-party models can read on-device context the way Apple's own foundation models can, with App Intents access, screen awareness, or personal data integration. Until Apple publishes the developer documentation at WWDC, the practical ceiling on what a non-Apple model can do on iOS will remain unclear.
The most cautious read is that Apple has built the minimum viable answer to the xAI antitrust claim: a public, configurable choice of AI providers. Whether the API has the capability surface to make a third-party model genuinely competitive with the Gemini-Siri integration is the question that will be answered in the developer sessions on June 9.
The Bottom Line
For the first time since Apple Intelligence launched, the AI on an iPhone will be a user choice instead of an Apple choice. Claude, Grok, Gemini, and ChatGPT will all be installable, switchable, and named in Settings. Apple becomes the routing layer. Each model brings its own voice, its own personality, and its own capability profile.
For the AI industry, the change is structural. ChatGPT loses its uncontested iPhone slot. Anthropic gets the consumer distribution it has never had. xAI gets the legal-and-product win it sued for. Apple gets to argue, with a straight face, that the antitrust complaint is now moot.
For ML practitioners, the meaningful question is which model wins the toggle, and it will not be the one with the highest leaderboard score. It will be the one whose voice, latency, and tone make iPhone users tap "Make this my default" the first time they try it. After 17 months of Apple Intelligence as a single-vendor product, the AI distribution war just turned into a consumer-product fight.
"It is widely known that Apple intends to partner with other generative AI chatbots." — Apple's motion to dismiss, filed in xAI v. Apple, US District Court for the Northern District of Texas (October 1, 2025)
Seven months later, what was a legal disclosure is now a product roadmap. The first iPhone shipping with the choice menu will be the one Tim Cook holds up on stage on June 8.
Sources
- Apple plans to make iOS 27 a Choose Your Own Adventure of AI models — TechCrunch (May 5, 2026)
- iOS 27 will let you choose between Gemini, Claude, and more for AI features: report — 9to5Mac (May 5, 2026)
- iOS 27 Will Let You Pick Claude or Gemini Instead of ChatGPT for Apple Intelligence — MacRumors (May 5, 2026)
- iPhone users will get to select a preferred AI model in iOS 27 — AppleInsider (May 5, 2026)
- With iOS 27, Apple may open Siri and AI features to third-party models — Business Standard (May 6, 2026)
- Apple could allow users to switch between AI providers like OpenAI, Google, and Anthropic in iOS 27 features — The Tech Portal (May 6, 2026)
- Musk's xAI sues Apple, OpenAI alleging anticompetitive scheme harmed X, Grok — CNBC (August 25, 2025)
- Apple Files Motion to Dismiss xAI Lawsuit Over ChatGPT Deal — MacRumors (October 1, 2025)
- U.S. judge rules Apple and OpenAI must face Elon Musk's xAI's lawsuit — MacDailyNews (November 14, 2025)
- Apple Nears $1 Billion-a Year Deal to Use Google AI for Siri — Bloomberg (November 5, 2025)
- Apple picks Google's Gemini to run AI-powered Siri coming this year — CNBC (January 12, 2026)
- WWDC 2026 announcement — Apple Newsroom (June 8 keynote)