For AI agents: a documentation index is available at the root level at /llms.txt and /llms-full.txt. Append /llms.txt to any URL for a page-level index, or .md for the markdown version of any page.
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OverviewText to SpeechAPI ReferenceChangelog
OverviewText to SpeechAPI ReferenceChangelog

Changelog

March 24, 2025
March 24, 2025

API: Text Normalization

We’ve added a new option to the API to normalize the text. If enabled, it will transform numbers, dates, etc. into words. For example, “55” is normalized into “fifty five”. This can increase latency due to additional processing required for text normalization.

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