9to5mac claims to have heard from "reliable sources" that early test builds of OS X 10.9 come with the voice assistant and first-party mapping software included.
Siri induction would build on the addition of dictation in OS X 10.8 Mountain Lion. Apple previously introduced dictation to its iPad 2, followed by full Siri support in the third generation model.
Apple traditionally names its desktop operating systems after species of cat and the latest version will be dubbed Lynx, according to AppleScoop.
The Cupertino firm is currently working towards improving its Maps service following a disastrous launch marred by inaccuracies.
Apple's OS X 10.9 is expected to be unveiled at its World Wide Developers Conference next year, for which a date is yet to be set.