Activefastaudio Proprietary

Gemini 2.5 Flash TTS Preview

by Google· Released May 2025

Gemini 2.5 Flash TTS Preview is a text-to-speech model that generates natural-sounding speech from text input. It is part of the Gemini 2.5 Flash family, optimized for low-latency, high-quality audio generation. This preview model allows developers to integrate expressive speech synthesis into applications.

Official Site API Docs

Input cost

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Output cost

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Context window

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Max output

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Modalities

audio

License

proprietary

Capabilities

Text-to-SpeechStreamingMultiple VoicesEmotional Tone ControlSSML Support

Best For

Generating natural-sounding speech from text for real-time applications.

Strengths

Low latency suitable for real-time use
Natural and expressive voice quality
Supports multiple languages and voices
Easy integration with Gemini API

Limitations

Preview model - may have limited voice options
No fine-tuning available
Output length may be limited
Not suitable for music or singing generation

Use Cases

Voice assistants and chatbots

Audiobook and content narration

Accessibility tools for visually impaired

Language learning pronunciation guides

Interactive voice response systems

Real-time captioning and dubbing

Personalized voice messages

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