Changelog

The voice-gender enum value notSpecified is renamed not_specified so the gender vocabulary is consistent snake_case across the API. This affects the gender field on GET /v1/voices, GET /v1/voices/{voice_id}, and POST /v1/voices (request enum and response), and the male/female values are unchanged.

• Before (pin 2026-06-27 or earlier): the unspecified gender is notSpecified.
• After (2026-06-28+): the unspecified gender is not_specified.

Migrating

Treat the unspecified gender as not_specified. Callers that pin a Speechify-Version date of 2026-06-27 or earlier continue to receive notSpecified; the official SDKs pin their build date automatically.