# Gemini 3.8 TTS launch evaluation: Voice Benchmark Profile

> Google’s September 23 launch post reports Hume voice-design and quality placements for Gemini 3.8 Flash TTS and Flash-Lite TTS.

- Scope: Hume Voice Design Benchmark, accent modeling, and Overall Quality Index, as reported by Google in its launch post
- Measurement lanes: Voice experience
- Primary metric: Provider-reported voice quality and design results (higher is better)
- Available evidence: Google states the Flash TTS design and accent scores and the two quality-index placements in prose; it does not state Flash-Lite’s underlying quality score.
- Owner: Google DeepMind
- Source snapshots refreshed: 2026-09-23

## Interpretation limit

These are Google-reported placements on third-party Hume evaluations, not independently verified results in this catalog. Flash-Lite has no published exact quality-index value in the launch prose. Voice evaluations remain separate from weighted text-model rankings.

## Primary sources

- [Owner page](https://blog.google/innovation-and-ai/models-and-research/gemini-models/gemini-3-8-text-to-speech/)

Canonical page: https://benchlm.ai/voice-benchmarks/gemini-3-8-tts-launch-evaluation