Will Siri use OpenAI or Apple’s own model in IOS 27?

As of now, Apple’s Siri/Apple Intelligence setup is generally hybrid: Apple’s own models handle most on-device, privacy-sensitive, and system-level tasks, and Siri can optionally hand off some requests to ChatGPT for broader or more generative answers if you allow it.

For iOS 27 specifically, there is no confirmed public information yet about whether Siri will rely more on Apple’s own models, OpenAI, or a mix of both. So the only solid answer is that it has not been publicly detailed yet.

The safest expectation is that Apple will likely continue using its own models as the core layer, with third-party model support remaining possible as an optional add-on, but that cannot be confirmed until Apple announces iOS 27 officially.