Our fastest engine for high-fidelity speech synthesis, offering low-latency and cost-efficient audio generation. Gemini 2.5 Flash TTS is best for real-time assistants, high-volume narration, and conversational use cases that require fine-grained control over voice style and pacing. [Try in Google AI Studio](https://aistudio.google.com?model=gemini-2.5-flash-preview-tts) ## Documentation Visit the [Text-to-Speech](https://ai.google.dev/gemini-api/docs/speech-generation) guide for full coverage of features and capabilities. ## gemini-2.5-flash-preview-tts | Property | Description | |---|---| | Model code | `gemini-2.5-flash-preview-tts` | | Supported data types | **Inputs** Text **Output** Audio | | Token limits^[\[\*\]](https://ai.google.dev/gemini-api/docs/tokens)^ | **Input token limit** 8,192 **Output token limit** 16,384 | | Capabilities | **[Audio generation](https://ai.google.dev/gemini-api/docs/speech-generation)** Supported **[Caching](https://ai.google.dev/gemini-api/docs/caching)** Not supported **[Code execution](https://ai.google.dev/gemini-api/docs/code-execution)** Not supported **[File search](https://ai.google.dev/gemini-api/docs/file-search)** Not Supported **[Function calling](https://ai.google.dev/gemini-api/docs/function-calling)** Not supported **[Grounding with Google Maps](https://ai.google.dev/gemini-api/docs/maps-grounding)** Not supported **[Image generation](https://ai.google.dev/gemini-api/docs/image-generation)** Not supported **[Live API](https://ai.google.dev/gemini-api/docs/live-api)** Not supported **[Search grounding](https://ai.google.dev/gemini-api/docs/google-search)** Not supported **[Structured outputs](https://ai.google.dev/gemini-api/docs/structured-output)** Not supported **[Thinking](https://ai.google.dev/gemini-api/docs/thinking)** Not supported **[URL context](https://ai.google.dev/gemini-api/docs/url-context)** Not supported | | Consumption options | **[Batch API](https://ai.google.dev/gemini-api/docs/batch-api)** Supported **[Flex inference](https://ai.google.dev/gemini-api/docs/flex-inference)** Not supported **[Priority inference](https://ai.google.dev/gemini-api/docs/priority-inference)** Not supported | | Versions | Read the [model version patterns](https://ai.google.dev/gemini-api/docs/models/gemini#model-versions) for more details. - `gemini-2.5-flash-preview-tts` | | Latest update | December 2025 |