Code analysis reveals Apple has built iOS 27 and macOS Golden Gate with deep support for swapping Siri's AI engine with third-party models like Claude or ChatGPT. The system works at two levels: as extensions that handle specific tasks, and as complete replacements for Apple's server-side Siri model that can access all system features and personal data.

• Model Delegation allows third-party AI (Claude, ChatGPT) to appear as Siri extensions, handling tasks like creating reminders or CSV files while passing system-level requests back to Siri itself.
• A second protocol in Model Manager Services lets developers completely replace Apple's Siri model with alternatives like GPT-5.6, giving those models full access to Apple's native prompts, tool definitions, and system actions.
• The EU's Digital Markets Act likely drove this design, as it requires Apple to grant third parties effective access to iOS hardware and software features available to Apple's own services, including Siri.
• ChatGPT extension is currently live in macOS Golden Gate, but Claude support and broader third-party access aren't yet available to users or developers.

Apple celebrated its 50th anniversary while facing significant challenges in the AI space. The company is shifting its strategy by partnering with Google for AI enhancements to Siri, amid concerns about user data and competition from rivals. Industry analysts suggest Apple must adapt quickly to maintain its relevance in a rapidly evolving technological landscape.

• Apple is licensing Google's Gemini AI to power upgraded Siri features, a reversal of its privacy-first stance that risks feeding user data into Google's ad business
• Siri has stagnated since its 2011 launch, with insiders like co-founder Dag Kittlaus arguing it never reached its potential without Steve Jobs' vision
• Apple is betting on on-device AI chips to process queries locally rather than in the cloud, aiming to preserve privacy while catching up on AI capability
• New AI features are slated by year-end, but early consumer reaction has been mixed, reflecting doubts about Apple's overall AI strategy

Apple is set to enhance Siri with Gemini, allowing for independent finetuning and improved emotional support responses. The partnership with Google will ensure that user data remains private, and the Gemini-powered Siri aims to provide more accurate answers and better handle complex queries. A gradual rollout of these features is expected, with some launching this spring.

• Apple can independently fine-tune Gemini rather than using Google's stock model, keeping responses on-brand and keeping user data off Google's servers via on-device processing and Private Cloud Compute.
• The upgraded Siri will give direct answers instead of link lists, handle emotionally sensitive conversations with more nuance, and merge command-based and AI-based query processing to better infer ambiguous user intent.
• Rollout is staggered: some features arrive as soon as this spring, while more advanced capabilities like conversation memory and calendar-based proactive suggestions are expected to debut at WWDC in June.