Apple appears set to equip the standard iPhone 18 with the complete suite of on‑device Siri AI features, a capability currently limited to the iPhone 17 Pro, Pro Max and iPhone Air. The base iPhone 17 remains excluded, so extending full support to the non‑Pro 18 model would mark the first time a budget iPhone can run the new intelligence stack.

iOS 27 defines three tiers of compatibility. iPhone 11 through iPhone 15 receive the OS but lack Apple Intelligence and Siri AI; iPhone 15 Pro and all iPhone 16 devices gain the AI core but miss the most demanding on‑device models; only the iPhone 17 Pro and iPhone Air unlock every feature. Analysts cite a 12GB RAM floor as the technical barrier, and a KB Securities note confirms the entire iPhone 18 lineup will ship with that memory.

Pricing rumors place the base iPhone 18 at $799, positioning it as the cheapest entry point for full Siri AI adoption, ahead of discounted iPhone Air units. If the 18e variant omits the AI suite, the standard model will likely absorb price‑sensitive buyers, helping Apple meet its goal of broader AI feature uptake across the iPhone ecosystem.