Speakable is a schema.org property that marks the sections of a web page best suited to be read aloud by voice assistants — Google's implementation was launched as a beta targeting news publishers in the US and Google Assistant on smart speakers.
The property is defined at schema.org/speakable and documented in Google's Speakable structured-data guide. Publishers use it on Article or NewsArticle pages, pointing at CSS selectors or an xpath that isolate the section to be spoken.
Google's public documentation still labels the feature as beta and restricted to news publishers in the US. Non-news sites can add the markup — schema.org validates it — but should not expect voice-assistant surfacing outside the documented scope.
The AEO angle is modest: Speakable does not currently affect ChatGPT, Perplexity, or Claude, and its Google surface is niche. Publishers who already ship news content and target Google Assistant should add it; others can safely skip and revisit if Google broadens the beta.
Do not confuse Speakable with schema types that do materially affect answer engines: QAPage, FAQPage, and Article deserve engineering time first.