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Gemini Docs

Google · Docs

Gemini Docs

September 23, 2026 at 4:02 PM UTC

New pages for Voice design: /gemini-api/docs/voice-design and /gemini-api/docs/generate-content/voice-design — create persistent custom vocal personas from natural-language prompts via the Voices endpoint (POST /v1beta/voices).

Changelog

Text-to-speech / Voices

  • New pages for Voice design: /gemini-api/docs/voice-design and /gemini-api/docs/generate-content/voice-design — create persistent custom vocal personas from natural-language prompts via the Voices endpoint (POST /v1beta/voices).
  • New pages for Voice replication: /gemini-api/docs/voice-replication and /gemini-api/docs/generate-content/voice-replication — replicate a speaker from reference and consent audio, with stateful voice_... IDs or stateless voicekey_... client keys.
  • New model docs: Gemini 3.8 Flash TTS (gemini-3.8-flash-tts) and Gemini 3.8 Flash-Lite TTS (gemini-3.8-flash-lite-tts), including capability comparison and migration guidance from earlier TTS models.
  • Speech generation and Generate content — speech generation now center on the Gemini 3.8 TTS models and controllable generation with speech_metadata plus inline vocal tags (preview framing removed).
  • Changelog: September 22, 2026 entry for Gemini 3.8 Flash TTS / Flash-Lite TTS GA, the Voices endpoint, Voice design, Voice replication, and the Extended Voice Library.
  • Deprecations: gemini-3.1-flash-tts-preview listed with recommended replacements gemini-3.8-flash-tts or gemini-3.8-flash-lite-tts; both new TTS models added with no shutdown date announced.
  • Models and hubs (Docs home, Generate content): Gemini 3.8 Flash TTS and Flash-Lite TTS added as new stable entries; Gemini 3.1 Flash TTS called out as legacy preview with an upgrade recommendation.
  • Pricing: standard and batch rates documented for Gemini 3.8 Flash TTS and Gemini 3.8 Flash-Lite TTS (including timed input/output and context-caching prices).
Older release← Sep 22, 10:09 UTCNewer release→ Sep 23, 18:02 UTC
All Gemini Docs releases →