Gemini 3.8 text-to-speech

Gemini 3.8 Flash TTS and Gemini 3.8 Flash-Lite TTS, released on September 23, 2026, have achieved the #1 and #2 spots on Hume AI’s Overall Quality Index. These models offer truly expressive performances without sacrificing reliability. They show major improvements over Gemini 3.1 Flash TTS in various use cases, including long-form content and dual-speaker screenplay control.

This release marks the first time a text-to-speech model has secured both the #1 and #2 spots on Hume AI’s Overall Quality Index, unlike previous versions.