Apple on Monday released iOS 27, which includes the company's long-delayed, rebuilt Siri AI assistant, days before the new iPhone 18 lineup reaches store shelves. The rollout comes under new CEO John Ternus, who succeeded Tim Cook on September 1 and used last week's launch event to pitch the iPhone 18 as the definitive AI-first device.

A beta launch, with a waitlist

The new Siri is in beta and opt-in only through Settings -- users may need to join a waitlist before getting access. Apple first previewed this version of Siri in June, after an earlier AI-Siri overhaul announced back in 2024 was delayed to 2026. Ternus described the pitch as "personal intelligence that's actually personal," leaning on the fact that iPhones already store the calendars, texts, and personal data that make on-device AI assistants useful.

Small on-device models, big cloud partners for the hard stuff

Unlike frontier-model rivals OpenAI, Anthropic, and Google, Apple is using smaller proprietary models designed to run on its own chips for most queries. For more demanding requests, Apple routes traffic through its Private Cloud Compute infrastructure -- which CNBC notes runs on Google Cloud, using Nvidia and Intel chips -- and Apple is also using Google's Gemini to help build its own models. Apple said some cloud-dependent Siri and Apple Intelligence features will carry daily usage limits, with expanded limits becoming a paid option "in the future." The new Siri can search a user's messages, emails, and calendar for things like addresses and instructions, answer general questions, search the web, and now supports conversational follow-ups via a dedicated Siri app that saves query history. English is supported first, with French, Japanese, Korean, Portuguese, and Spanish due next month; the feature won't launch in the EU or China for regulatory reasons.

Market Impact: Modestly bullish for Nasdaq and AI-infrastructure names, though not a standalone catalyst

For Nasdaq, this is a mildly bullish data point rather than a market-moving shock. Apple finally shipping a genuinely LLM-powered Siri -- even in opt-in beta form -- removes a long-running execution overhang on AAPL heading into iPhone 18 sell-through week, and the plan to monetize expanded AI usage limits "for a fee in the future" hints at a new services-revenue lever analysts have been waiting for. It's also a small positive read-through for AI-infrastructure suppliers: CNBC's detail that Apple's Private Cloud Compute runs on Google Cloud with Nvidia and Intel chips is a reminder that even the most vertically-integrated Big Tech name still leans on external compute for its hardest AI workloads, reinforcing continued capex demand across the AI supply chain even as the sector digests this week's broader AI-safety-driven selloff.

The near-term risk to watch is adoption, not technology: a waitlisted opt-in beta means real usage data (and any Siri-specific stumbles) won't show up clearly until iPhone 18 sell-through numbers and subsequent earnings commentary, so don't expect this alone to move AAPL or NDX materially before then -- the more decisive Nasdaq catalyst this week remains Wednesday's Fed rate decision.