Capabilities

Verbatim tags

Use verbatim tags so Inworld TTS reads booking references, license plates, serial numbers, and IDs character by character.

Alphanumeric strings such as booking references, license plates, serial numbers, and IDs can be ambiguous for TTS. The model might read AHAA7771Z as a word, a number, or a mix of both. Wrap the sequence in <verbatim> tags to spell it out character by character: letters as letter names, digits as single digits, and symbols by name (for example, @ is read as "at"). Example:

Your booking reference is <verbatim>AHAA7771Z</verbatim>.

The tagged sequence is read as "A H A A seven seven seven one Z" instead of being read as a word or a number.

Constraints:

Use well-formed tags with the sequence inside: <verbatim>AHAA7771Z</verbatim>. Tag names are case insensitive; <say-as interpret-as="verbatim"> is an equivalent, SSML-standard spelling of the same tag.
Keep the content to letters, digits, spaces, and these symbols: ( ) - # : . , + @ / _ *. Tags containing other characters may be read as regular text instead of being spelled out.
Verbatim tags require text normalization to be enabled. If applyTextNormalization is set to OFF, the tags are removed and their content is read as regular text.
Expansion is currently English-oriented: characters are read with English letter and number names.

Verbatim tags are most reliable on inworld-tts-2 — we recommend it for alphanumeric-heavy content. As with any generative TTS, exact renditions can vary; keep tagged sequences short where possible and verify output for your use case.