How to Replace Siri With ChatGPT, Claude, or Gemini

If you have been searching for how to replace Siri with ChatGPT, here is the part the first page of Google will not tell you. The three most popular guides each hand you a different Settings menu, and two of those menus do not exist. One invents a screen called "Default AI Service". Another sends you to "Siri & Search", a menu Apple renamed years ago. The real path is documented by Apple, it works on every iPhone and Mac running Apple Intelligence, and it takes about thirty seconds.

Making Claude or Gemini the assistant behind the side button, is a different story. The framework for it sits in the iOS 27 beta right now, and it is switched off. This guide covers the steps that work today on iPhone and Mac, and separates what Apple has actually said from what has merely been reported. It also explains why the European Union situation makes your Mac the device that matters this autumn, and which model to pick when the switch gets flipped.

The Key Takeaways

• ChatGPT works today: Settings, then Apple Intelligence & Siri, then below Extensions, tap ChatGPT and tap Set Up. No account required.
• Claude and Gemini do not: no third-party assistant registers as a Siri extension yet, on any device, in any beta.
• There is a real workaround: put Talk Live with Gemini on the Action button, or say "Ask Claude" to Siri, which Anthropic ships as an App Intent.
• Apple has never announced it: third-party Siri Extensions appears in neither June 2026 newsroom release. The story traces to Bloomberg reporting plus strings found in the beta.
• Say "Ask ChatGPT" first and Siri skips the confirmation prompt entirely, which is Apple's own documented tip rather than a hack.
• EU readers, use your Mac: Apple confirmed Siri AI ships on macOS 27 but is delayed on iOS 27 and iPadOS 27 with no timeline.

The Short Answer, Before the Steps

You cannot currently choose Claude, Gemini, Grok or Perplexity as the assistant that answers "Hey Siri". Nobody can. If a guide tells you otherwise, it is describing a feature that has been reported but never shipped.

What you can do is turn on the ChatGPT extension, which changes Siri's behaviour more than most people expect. Once it is on, Siri stops saying "I found some web results" and starts handing the hard questions to a model that can answer them. It is not a replacement in the strict sense, because Siri still decides when to pass the request along. In daily use it closes most of the gap. Our Apple Intelligence and ChatGPT comparison covers what the extension actually changes.

How to Replace Siri With ChatGPT on iPhone

These steps come from Apple's own iPhone user guide, not from a rumour. You need an iPhone that supports Apple Intelligence and you need Apple Intelligence turned on first.

1. Open the Settings app on your iPhone.
2. Tap Apple Intelligence & Siri.
3. Scroll to the Extensions section, then tap ChatGPT.
4. Tap Set Up.
5. Tap Enable ChatGPT to use it without an account, or tap Use ChatGPT with an Account and sign in.

Account or No Account?

Skipping the account is the faster route and the more private one. Apple states that without an account, OpenAI receives nothing tied to your Apple Account, must not store your request, and must not use it to train its models. Sign in and that protection ends, because your ChatGPT account settings and OpenAI's privacy policy take over instead. The trade is history and higher limits: a paid ChatGPT account lets your iPhone reach the advanced capabilities more often, and your requests appear in your chat history. Signing in later is easy, through Settings, Apple Intelligence & Siri, ChatGPT, then Sign In.

How to Replace Siri With ChatGPT on Mac

The Mac path mirrors the iPhone one and almost nobody writes it down, which is odd given how much more text you handle on a Mac. Open System Settings, click Apple Intelligence & Siri in the sidebar, find ChatGPT below Extensions, click Set Up, then click Next and pick the same account option as above.

Once it is running, the extension reaches further than the Siri prompt. Writing Tools uses it to draft and rewrite text anywhere you type, Image Playground borrows its visual styles, and Shortcuts can call it directly for multi-step jobs. If you already lean on Siri Shortcuts to automate repetitive work, that last one is where the extension quietly earns its place.

The ChatGPT desktop app goes further than the extension does. Since August 20, 2026 an Apple Messages plugin lets it read your iMessage, SMS and RCS threads and send replies once you approve them, which is a job people have always expected Siri to do and it never did well. Our guide to the ChatGPT Mac app and its August changes covers what that costs you in permissions.

Stop Siri Asking Permission Every Time

By default Siri checks with you before every handoff, which gets tiresome fast. There are two documented ways around it.

The quick one is verbal. Start your question with the words "Ask ChatGPT" and Siri sends it straight through. Apple publishes this as a tip in its own guide, so it is a supported behaviour rather than a trick someone discovered. The permanent one lives in Settings: go to Apple Intelligence & Siri, tap ChatGPT, and turn off Confirm ChatGPT Requests.

One limit survives both methods. Apple states you are always asked before any photo or file is sent, no matter how the setting is configured. To switch the whole thing off again, tap ChatGPT and turn off Use ChatGPT, then turn off Setup Prompts if you also want Siri to stop suggesting it. Parents get a third option, since access is blockable in Screen Time under the heading Apple labels "Intelligence Extensions".

How to Replace Siri With Claude, Gemini, or Grok

You cannot, and the honest version of this section is more useful than a set of invented steps.

Here is what is verifiable. Apple's own announcements from June 2026 do not mention third-party models at all. The WWDC 2026 keynote and its follow-up releases describe Siri AI as running on Apple Foundation Models and Private Cloud Compute. The closest thing to an outside model is Apple building its own systems in collaboration with Google's Gemini. Nowhere does Apple say you will get to choose your assistant.

What exists is reporting. Bloomberg's Mark Gurman described an Extensions framework in March 2026. The Next Web later reported that the iOS 27 beta contains both a settings panel and a dedicated App Store section for it, built but toggled off on Apple's backend. Per that same report, Apple has neither confirmed nor denied that the feature ships this autumn. Every confident tutorial you have read is downstream of those two sources.

Why You Only See ChatGPT in Extensions

That is expected. You have not broken anything, and there is nothing to reinstall.

Whether you are on the public release or the iOS 27 developer beta, ChatGPT is the only entry because it is the only integration Apple has ever shipped. No Claude, Gemini or Grok build registers itself as a Siri extension. Apple Community threads asking why the Extensions list looks empty predate this entire story, and the answer has not changed.

Put Gemini on the Action Button Instead

The Extensions list is not the only way to change what a button press does. On an iPhone 15 Pro or later, the Action button will run any shortcut, and Google's app installs six of its own. Open Settings, tap Action Button, swipe to Shortcut, tap Choose a Shortcut, then pick Talk Live with Gemini. Press and hold from then on and you get Gemini's live voice mode rather than Siri.

It is not the same thing as an extension, and it is worth being clear about the difference. Siri is untouched, so "Hey Siri" still reaches Apple's assistant, and nothing you say to Gemini this way is passed through Apple's privacy layer. What you get is the one interaction most people mean when they say they want to replace Siri: hold the button, talk to a real model. On an iPhone with no Action button, the same shortcut sits happily in Control Center, on the Lock Screen, or as a Home Screen icon.

Say "Ask Claude" and Siri Hands It Over

Claude takes a different route, and this one does go through Siri. Anthropic ships an "Ask Claude" App Intent on iOS 18 and later, which its own documentation describes as reachable from Spotlight search, Siri, the Share menu, and any app that supports iOS intents. Say "Ask Claude" to Siri and it prompts you for a message, then hands the whole thing to Claude. There is also an Analyze Photo with Claude control you can drop into Control Center or onto the Lock Screen.

ChatGPT and Grok expose similar intents through their own apps, so the same trick works with each of them. The pattern is worth remembering, because it is what an assistant swap actually looks like until Apple flips Extensions on: the app publishes an intent, Siri routes to it by name, and you keep saying the name.

The EU Split: Your Mac Matters More Than Your iPhone

This is the part with real consequences, and Apple published it directly rather than leaving it to reporters. Under the Digital Markets Act, Siri AI is delayed in the European Union on iOS 27 and iPadOS 27, and Apple states there is currently no timeline for when that changes. Apple Watch is caught in the same net, since Siri AI on watchOS 27 needs a paired iPhone that has it.

macOS 27 and visionOS 27 are exempt, because neither platform is designated under the Act. For anyone in the EU, that inverts the usual order of things: this autumn your Mac gets the new Siri and your iPhone does not. Apple did offer a workaround, a Trusted System Agent designed to give rivals the same access safely, paired with an eighteen month rollout. By Apple's account the European Commission rejected it, along with every other proposal put forward.

Which AI Should Answer "Hey Siri"?

Worth deciding now, because the moment the switch flips you will want an answer rather than an afternoon of testing.

If you want the detailed head to head rather than the summary, our comparison of Claude, Gemini and ChatGPT works through where each one actually pulls ahead.

There is a structural catch worth understanding before you get attached to the idea. A system default is singular by design. Picking Claude as the voice behind the side button means Gemini is not there, and picking Gemini means Claude is not. That is fine for the quick spoken requests a phone assistant handles, and it is a poor fit for real work, where the model you want changes with the task. The practical arrangement most people land on is one assistant at the operating system level for voice, and a separate app holding every model for everything else. Our rundown of the best AI models covers which ones are worth having in that second category.

What Happens to Your Data

Apple is unusually specific here, and the detail is better than the reputation of these handoffs suggests. Your request goes to ChatGPT along with limited context: time zone, country, device type, language, and which feature you were using. Your IP address is obscured, though your general location is passed on so OpenAI can prevent fraud and meet legal obligations.

The account question changes everything downstream. Signed out, OpenAI gets nothing linked to your Apple Account, must process the request only to answer it, and is barred from training on it. Signed in, your own ChatGPT settings govern instead. For anyone weighing whether Apple's approach is worth the trade at all, our honest verdict on Apple Intelligence takes that question on directly.

Conclusion

Turn on the ChatGPT extension today. It takes half a minute, it needs no account, it works identically on iPhone and Mac, and it fixes the single most irritating thing about Siri. Say "Ask ChatGPT" to skip the prompt, or switch off Confirm ChatGPT Requests and stop being asked at all.

Then wait on the rest. Claude and Gemini as Siri replacements are a reported feature, not an announced one, and Apple has stayed silent while a dozen sites published step-by-step guides to a menu that has never existed. When it does arrive, remember that it hands you one default rather than a collection, which is exactly why a multi-model app on your Mac and iPhone remains the more useful half of the setup. Our full iOS 27 guide tracks what else is landing this September.

Last checked 18 August 2026, against iOS 27 developer beta 5.

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