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/chirp-3-hd/

# Chirp 3 HD voices (Google Cloud Text-to-Speech)

Google, Chirp 3 family. Status: current. Type: speech and audio. Released: 2025-04-02.

## How to call it

| Provider | Model id | Endpoint | Docs |
|---|---|---|---|
| Google Cloud Text-to-Speech API | `<locale>-Chirp3-HD-<Voice> (e.g. en-US-Chirp3-HD-Charon)` | https://texttospeech.googleapis.com (regions global, us, eu, asia-southeast1, europe-west2, asia-northeast1) | https://docs.cloud.google.com/text-to-speech/docs/chirp3-hd |

## Pricing

- Per 1M characters: $30
- Unit as published: USD per 1M characters (first 1M chars/month free); Chirp 3 Instant custom voice $60 per 1M characters
- Source: https://cloud.google.com/text-to-speech/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: 97. 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/
- After it from Google: Gemini 2.5 Flash TTS / Pro TTS (2025-05-20) https://postcutoff.com/m/gemini-2-5-tts/
- Closed weights; access is hosted only.

## What stands out

- Streaming HD voices in 60+ locales: 28 named voices, streaming and batch synthesis, pace (0.25-2x), pause and IPA/X-SAMPA pronunciation controls, SSML. Source: https://docs.cloud.google.com/text-to-speech/docs/chirp3-hd
- Instant custom voice (found after launch): Chirp 3 Instant custom voice clones a voice from a short sample (30+ locales), priced at $60 per 1M characters. Source: https://docs.cloud.google.com/text-to-speech/docs/release-notes

## Notes

GA 2025-04-02 (8 speakers, 31 locales), since expanded to 60+ locales. Google's enterprise, non-LLM TTS line; the Gemini-TTS models (gemini-2.5-*-tts, Gemini 3.1 Flash TTS) are offered in the same Cloud TTS API. No 2026 successor (e.g. 'Chirp 4') found.

Sources: [Chirp 3 HD docs](https://docs.cloud.google.com/text-to-speech/docs/chirp3-hd), [Cloud TTS release notes](https://docs.cloud.google.com/text-to-speech/docs/release-notes), [pricing](https://cloud.google.com/text-to-speech/pricing).

Model page: https://postcutoff.com/m/chirp-3-hd/