Gemini 3.8 Flash TTS

Google's most expressive text-to-speech model, generating custom voices from natural-language prompts across 100+ languages.

Google · Generative media (image, video, audio, music, voice/avatar generation) · model

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Overview

Google released Gemini 3.8 Flash TTS on September 23, 2026, as its most expressive audio generation model to date. It supports generative voice design from natural-language prompts, voice replication from 30-second samples with consent verification and SynthID watermarking, line-by-line performance direction, hours-long consistent long-form narration, dual-speaker scene staging, and non-verbal vocal bursts like laughs and sighs. It ranked #1 overall on Hume AI's Voice Design Benchmark (71.4) and topped Voice Arena leaderboards for Japanese, Brazilian Portuguese, Vietnamese, Modern Standard Arabic, Mexican Spanish, and Hindi.

This is a sourced directory entry. Features and capabilities are reported in the linked sources; this entry does not document independent Aymorphic testing.

Key features

  • Generative voice design from natural-language prompts across 100+ languages and dialects
  • Voice replication from 30-second audio samples with consent verification and SynthID watermarking
  • Line-by-line performance direction (pacing, emotion, delivery via stage directions)
  • Long-form generation maintaining voice/character consistency across hours of audio
  • Dual-speaker scene staging and realistic non-verbal vocal bursts
  • 2,000+ production-ready voices including regional varieties (Mexican Spanish, Quebec French, Scots English)

Use cases

  • Custom voice creation for audiobooks, games, and video narration
  • Multi-speaker dialogue and scripted scene generation
  • Voice replication for consistent branded/character voices
  • Long-form narration requiring hours of consistent audio

Pricing

unknown; available today via the Gemini API and Google AI Studio for developers, with Gemini Enterprise API access coming soon

Pricing reflects the source record and may change. Confirm current terms with the provider.

Dates and sources

Released
23 Sept 2026
Record updated
24 Sept 2026
Record last checked
24 Sept 2026

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