iPhone 18 to Pack 12GB of RAM, Bringing Advanced Siri AI to All Models

The upcoming iPhone 18 is shaping up to be a turning point for Apple Intelligence, not because of a flashy new chip or design, but because of a quiet memory upgrade that could level the playing field across the entire lineup. Multiple supply chain reports and analyst notes now point to a significant change: every iPhone 18 model, from the base version to the Pro Max, is expected to ship with 12GB of RAM. This 50% increase from the iPhone 17's 8GB isn't just a spec bump—it's the key that unlocks Apple's most powerful on-device AI features for all users .

The Siri AI imperative

At WWDC 2026, Apple officially confirmed that its most capable on-device AI model, which is responsible for more expressive Siri voices and major accuracy improvements for systemwide dictation, requires a minimum of 12GB of unified memory . Apple's AI system comes in two tiers: a standard "AFM Core" and a more demanding "AFM Core Advanced" that needs the full 12GB to function .

This requirement immediately created a hardware divide. Only three current iPhones—the iPhone Air, iPhone 17 Pro, and iPhone 17 Pro Max—have enough memory to run the advanced model. The standard iPhone 17, with its 8GB of RAM, was left out of these specific features just months after its own launch . The iPhone 18's memory upgrade directly addresses this gap, ensuring that the base model is no longer locked out of the best Siri AI capabilities .

Pricing strategy: absorbing the cost

While a significant hardware upgrade often leads to a higher price, reports suggest Apple is planning to hold the line. Analysts at KB Securities expect the starting price of the iPhone 18 to remain at $799. The reasoning is strategic: by absorbing the increased bill of materials, Apple can accelerate adoption of its new Siri AI features and stimulate a stronger replacement cycle, prioritizing shipment growth over per-unit profit . This approach suggests Apple views broad AI access not just as a feature, but as a core part of its competitive strategy.

The memory supply chain

Making this memory upgrade happen at the scale of an iPhone launch requires enormous coordination within the supply chain. Samsung is positioned as the lead supplier, providing LPDDR5X DRAM chips manufactured on a 10nm-class 1b process. A significant early indicator emerged in late 2025 when reports circulated that Apple had placed an order with Samsung for approximately 13 million of these memory chips, with delivery targeted for the second quarter of 2026 . Samsung is reportedly supplying 60–70% of Apple's LPDDR5X needs for the iPhone 17 generation and is securing similarly large volumes for the iPhone 18 .

Apple hasn't put all its chips in one basket. The company has also engaged with other major memory makers, SK hynix and Micron, to diversify its supply. However, industry reports consistently note that Samsung's production capacity makes it the only manufacturer able to fulfill the sheer volume of Apple's orders, especially as competitors shift their own 1b DRAM capacity toward high-bandwidth memory (HBM) for AI servers .

A staggered launch schedule

In a departure from its traditional September launches, Apple is widely reported to be splitting the iPhone 18 release into two distinct phases. This "twin date" strategy has been corroborated by Bloomberg's Mark Gurman, analyst Ming-Chi Kuo, The Information, and ET News .

• Fall 2026: The premium tier, including the 6.3-inch iPhone 18 Pro and 6.9-inch iPhone 18 Pro Max, is expected to launch alongside Apple's first foldable iPhone, which may measure around 5.5 inches when closed and 7.8 inches when opened .
• First half of 2027: The standard iPhone 18 and a budget-oriented iPhone 18e are planned for a spring release window .

This phased approach is intended to manage the complexity of introducing a foldable device and to smooth out supply chain demands. It's a significant logistical shift that underscores the ambition—and the challenge—of the iPhone 18 generation .

A note of caution: All information is based on supply chain reports, analyst forecasts, and insider accounts, not official announcements from Apple. Specifications, pricing, and timelines can shift ahead of a formal product unveiling.