Code sleuth "pdfu" has uncovered iOS 27 and macOS Golden Gate private frameworks that show Apple has designed its new Siri architecture to work with third-party AI models at what appears to be a surprisingly deep level. One mechanism called Model Delegation allows Claude to appear as a Siri extension in the same way as the existing built-in ChatGPT extension. In pdf's video, shared on X , the macOS user brings up the "Search or Ask" bar and chooses Claude as the AI model via an "Ask..." contextual menu. After enabling the Claude extension, the user asks Siri to "Ask Claude" to set a reminder in Apple's Reminders app. Claude then interprets the natural language reminder request and Siri subsequently creates the reminder. The implication is that if the request requires access to an Apple system feature, Claude hands the task back to Siri. In another example, Claude can be seen in a Siri app conversation window receiving a request to create a CSV file – something Siri itself cannot handle – and successfully returning the result. What's more intriguing is the second protocol demonstrated in the video that appears to go considerably further, and could really open up the AI landscape for Apple software requests. An inference provider in "Model Manager Services" apparently allows Apple's own server-side Siri model to be completely replaced by another model, such as GPT-5.6. In this scenario, ChatGPT receives Apple's Siri planner prompt and tool definitions, which enables it to request system actions, receive the resulting personal data, and formulate an answer that Siri presents using its own interface and voice. And here's an app extension replacing Siri AI's server model with GPT-5.6 Terra. It uses the Inference Providing protocol in Model Manager Services. GPT-5.6 receives Apple's native Siri planner prompt and tool definitions. It can make tool calls that perform system actions, and... pic.twitter.com/cz88kyq3io — pdfu (@itspdfu) September 13, 2026 In the demonstration video, the user asks the ChatGPT model (within the Siri app) to find emails about a specific topic, summarize their contents and action points, then send an message to a person in the user's contacts via the Messages app. The response is then shown as logged in OpenAI's platform web interface. The European Union's Digital Markets Act may have helped shape Apple's approach here, as it requires Apple to give third parties effective access to iOS hardware and software features available to Apple's own services, and the European Commission has specifically said this principle extends to Siri. The "Ask..." implementation is currently limited to the ChatGPT extension in the macOS 27 Golden Gate Release Candidate (which is effectively the final version of the software set to be released later today), so Claude is not yet available. Meanwhile, Apple has not yet opened up the model delegation entitlement to third parties and it isn't front-facing to users, but it at least shows how extensively Apple has engineered Siri for future model interoperability. Related Roundups: iOS 27 , iPadOS 27 , macOS Golden Gate Tags: ChatGPT , Claude , Siri , Siri AI Related Forums: iOS 27 , macOS Golden Gate This article, " Apple's Siri AI Can Be Swapped Out for Claude, ChatGPT, Code Shows " first appeared on MacRumors.com Discuss this article in our forums
Apple recently unveiled the iPhone 18 Pro and ‌iPhone 18 Pro‌ Max, featuring a new Main camera with a variable aperture, new Pro camera controls, the A20 Pro chip, and more. With the foldable iPhone Duo now sitting above them in the lineup, the two Pro models are no longer the most expensive iPhones Apple sells, but they remain the most fully-featured traditional iPhones available. The ‌iPhone 18 Pro‌ starts at $1,199 and the ‌iPhone 18 Pro‌ Max starts at $1,299. Both see a $100 increase over the equivalent iPhone 17 Pro models, and the increases grow steeper further up the storage ladder , with a 1TB ‌iPhone 18 Pro‌ now costing $300 more than a 1TB ‌iPhone 17 Pro‌ did last year. Both phones have the same OLED Super Retina XDR always-on display with ProMotion and the Dynamic Island , the A20 Pro chip, 5G connectivity, a 48 megapixel Pro Fusion camera system, and the same four color options . Both are also offered in the same four storage tiers, including a 2TB option that is available on the smaller Pro model for the first time. Although the two phones share the vast majority of features, there are eight differences between the devices. Our guide highlights the crucial differences between the ‌iPhone 18 Pro‌ and ‌iPhone 18 Pro‌ Max, and helps to answer the question of how to decide which of these two iPhone models is best for you. Both models share the same thickness of 0.34 inches (8.75 mm), but otherwise have very different sizes and weights. ‌iPhone 18 Pro‌ ‌iPhone 18 Pro‌ Max Height 5.91 inches (150.0 mm) 6.43 inches (163.4 mm) Width 2.83 inches (71.9 mm) 3.07 inches (78.0 mm) Weight 7.44 ounces (211 grams) 8.78 ounces (249 grams) Other differences essentially come down to display size and battery life. As was the case last year, there are no camera differences between the two devices at all for this generation, with the variable aperture Fusion Main camera and the new manual Pro controls appearing on both models. ‌iPhone 18 Pro‌ ‌iPhone 18 Pro‌ Max 6.3-inch display 6.9-inch display 2622-by-1206-pixel resolution 2868-by-1320-pixel resolution 4,056 mAh battery 5,391 mAh battery Up to 36-hour video playback Up to 45-hour video playback Up to 33-hour streamed video playback Up to 40-hour streamed video playback Apple C2 modem in all countries Apple C2 modem outside the U.S., Qualcomm modem in the U.S. Apple does not advertise battery capacities on its product pages, but energy labels published in Europe confirm the exact figures for models that retain a SIM card tray. The capacities above apply to those models. eSIM-only versions, including all iPhones sold in the United States, have slightly larger cells because there is no tray taking up internal space, and Apple has not yet disclosed those figures. Apple lists its own C2 modem in the ‌iPhone 18 Pro‌ in every country, but the ‌iPhone 18 Pro‌ Max only uses the C2 outside the United States. U.S. units of the larger model instead contain a Qualcomm modem, and iOS code seen points to the same radio used in last year's ‌iPhone 17 Pro‌ models, which would make it the Snapdragon X80. The C2 supports both sub-6GHz and mmWave 5G, as the Qualcomm part does, and Apple says it is faster and more energy efficient than the C1X while adding AI-driven improvements to cellular quality and reliability. Real-world comparisons will not be possible until reviewers test both radios on the same networks. The clearest hint that the hardware genuinely differs is in the band listings, where the U.S. ‌iPhone 18 Pro‌ supports LTE Band 106 and the U.S. ‌iPhone 18 Pro‌ Max does not. Pricing is also a key area of difference, with the ‌iPhone 18 Pro‌ Max reaching $2,499 when configured with 2TB of storage. 256GB 512GB 1TB 2TB ‌iPhone 18 Pro‌ $1,199 $1,399 $1,799 $2,399 ‌iPhone 18 Pro‌ Max $1,299 $1,499 $1,899 $2,499 The ‌iPhone 18 Pro‌ Max represents the most you can get out of a traditional iPhone with the best possible battery life, but that does not necessarily translate into a worthwhile purchase for all users. At 8.78 ounces (249 grams), it is heavier than any iPhone Pro Max that came before it, and with a 6.9-inch display it is a large and hefty device. Some may find the ‌iPhone 18 Pro‌ Max's size excessive or uncomfortably large to hold, while others will love the larger display for consuming media. Screen size is ultimately a matter of personal preference, and since the ‌iPhone 18 Pro‌ and ‌iPhone 18 Pro‌ Max share all of their other features, it comes down to individual taste. Battery life is the one area where the gap between the two models has widened meaningfully this year. The ‌iPhone 18 Pro‌ Max gained six additional hours of video playback over the ‌iPhone 17 Pro‌ Max, while the ‌iPhone 18 Pro‌ gained three. The result is a nine-hour advantage for the larger model, up from six hours in the previous generation. If getting through a long day without reaching for a charger is your priority, the case for the Pro Max is more persuasive than it has been for some time. The added $100 in price for the ‌iPhone 18 Pro‌ Max seems fair for its additional display area and battery life, but it is important to weigh up these factors in your personal use-case. That $100 premium holds at every storage tier, so the larger model never becomes proportionally more expensive as capacity rises. Both devices become costly quickly with added storage, though, and the 1TB and 2TB tiers now carry surcharges that are considerably steeper than in previous years. U.S. buyers have one extra factor to bear in mind. Choosing the ‌iPhone 18 Pro‌ Max in the United States means giving up Apple's own modem, and while the day-to-day difference is likely to be very small, it is an unusual position for the more expensive device to be in. If you specifically want the C2 and you are buying in the U.S., the smaller model is the only way to get it. The most important decision point when choosing between the ‌iPhone 18 Pro‌ and ‌iPhone 18 Pro‌ Max is undoubtedly screen size, but comfort, pocketability, weight, battery life, and now the modem are also important considerations that will depend based on your preferences. If you are hesitant about the size and weight of the ‌iPhone 18 Pro‌ Max, it may be better to stick with the ‌iPhone 18 Pro‌, which no longer forces you to give up the largest storage option to get the smaller body. If size is not a concern, the ‌iPhone 18 Pro‌ Max is otherwise unlikely to disappoint, especially if price is not an issue. Related Roundup: iPhone 18 Pro Buyer's Guide: iPhone 18 Pro (Buy Now) Related Forum: iPhone This article, " iPhone 18 Pro vs. iPhone 18 Pro Max Buyer's Guide " first appeared on MacRumors.com Discuss this article in our forums
