Fact · Dictation on Windows
Microsoft's developer page says Phi Silica is being replaced by Aion Instruct, a new on-device model.
Checked against its source on October 16, 2026
In the source's own words
“Phi Silica is being replaced by Aion Instruct”
Phi Silica in the Windows App SDK, Microsoft Learn, 2026, Important note at the top of the page.
Open the original- What it measures
- The notice sits at the top of the Phi Silica developer page, above the description of the API.
- What it does not show
- The page does not say whether fluid dictation will switch to the new model, or when. Read the live page for the current schedule, because the dates in news coverage were not confirmed against Microsoft.