As of: 2026-11-13 13:49 CET.
Researched and written by AI agents (Claude Opus 5.5 in Claude Code), with a human editor. How we work: https://postcutoff.com/about/
Canonical page: https://postcutoff.com/m/gemini-2-5-tts/

# Gemini 2.5 Flash TTS / Pro TTS

Google DeepMind, Gemini 2.5 family. Status: legacy. Type: speech and audio. Released: 2025-05-20.

## How to call it

| Provider | Model id | Endpoint | Docs |
|---|---|---|---|
| Gemini API | `gemini-2.5-flash-preview-tts` |  | https://ai.google.dev/gemini-api/docs/models |
| Gemini API | `gemini-2.5-pro-preview-tts` |  | https://ai.google.dev/gemini-api/docs/models |
| Google Cloud Text-to-Speech (Gemini-TTS, GA) | `gemini-2.5-flash-tts` |  | https://docs.cloud.google.com/text-to-speech/docs/release-notes |
| Google Cloud Text-to-Speech (Gemini-TTS, GA) | `gemini-2.5-pro-tts` |  |  |
| Google Cloud Text-to-Speech (preview) | `gemini-2.5-flash-lite-preview-tts` |  |  |

## Pricing

- Input: $0.50 per 1M tokens
- Output: $10 per 1M tokens
- Unit as published: per 1M tokens (USD) for Flash TTS; Pro TTS $1.00 in / $20.00 audio out (25 audio tokens per second)
- Source: https://ai.google.dev/gemini-api/docs/pricing
- Last checked: 2026-09-29

## Specs

- Input: text
- Output: audio
- Context window: not published
- Max output: not published
- Open weights: no
- Licence: proprietary

## Where it stands

- Newer speech and audio models in the registry since its release: 95. The 5 newest:
  - NVIDIA Nemotron 3.5 Transcribe (30B-A4B) (2026-10-28) https://postcutoff.com/m/nemotron-3-5-transcribe/
  - Hy-SimulMT-30B-A3B (2026-10-22) https://postcutoff.com/m/hy-simulmt-30b-a3b/
  - Eleven Realtime v1 Max / Mini (2026-10-20) https://postcutoff.com/m/eleven-realtime-v1-max/
  - Voxtral Mini Transcribe 3 (+ Mini Transcribe Realtime 3) (2026-10-20) https://postcutoff.com/m/voxtral-mini-transcribe-3/
  - Voxtral Small Transcribe 3 (2026-10-20) https://postcutoff.com/m/voxtral-small-transcribe-3/
- Before it from Google: Chirp 3 HD voices (Google Cloud Text-to-Speech) (2025-04-02) https://postcutoff.com/m/chirp-3-hd/
- After it from Google: Gemini 2.5 Flash Native Audio (Live, preview) (2025-09-23) https://postcutoff.com/m/gemini-2-5-flash-native-audio/
- Closed weights; access is hosted only.

## What stands out

- Prompt-controlled multi-speaker TTS: Natural-language control of style, accent, pace and emotion; single and multi-speaker synthesis; 30 speakers in 80+ locales (Cloud GA). Source: https://docs.cloud.google.com/text-to-speech/docs/release-notes

## Notes

Gemini API ids are 'Limited Access' preview with no shutdown date (migrate to gemini-3.8-flash-tts / -lite-tts). In Cloud TTS, gemini-2.5-flash-tts and gemini-2.5-pro-tts went GA 2025-09-30; streaming added 2025-11-07. Released date = Google I/O 2025 preview (from memory, not re-verified today); Dec 10 2025 update improved expressivity and pacing.

Sources: [Gemini models](https://ai.google.dev/gemini-api/docs/models), [Gemini pricing](https://ai.google.dev/gemini-api/docs/pricing), [Cloud TTS release notes](https://docs.cloud.google.com/text-to-speech/docs/release-notes), [Cloud TTS pricing](https://cloud.google.com/text-to-speech/pricing).

Model page: https://postcutoff.com/m/gemini-2-5-tts/