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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Changelog

July 22, 2025
July 22, 2025

Original Text in Word Durations

A new parameter, wordDurationsAsOriginalText, has been added to the /v1/speech/generate endpoint.

By default, the wordDurations object in the API response contains normalized text. When you set wordDurationsAsOriginalText to true, the response will instead include the original, un-normalized text from your request. This allows for a direct mapping between your input text and the corresponding word-level timestamps.

This feature is currently available for English only.

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