Google TTS Chirp 3 HD

Google Speech synthesisStreaming

Input$30/M

Context4K

Provider list prices: no platform markup, pay-as-you-go. These are official list prices. Logged-in customers may see effective prices including workspace discounts on /console/pricing.

Use Google TTS Chirp 3 HD in 30 seconds

OpenAI-compatible: swap the base_url, keep your SDK. POST /v1/chat/completions

from openai import OpenAI

client = OpenAI(
    base_url="https://synthorai.io/v1",
    api_key="sk-syn-...",
)

resp = client.chat.completions.create(
    model="google-tts-chirp3-hd",
    messages=[{"role": "user", "content": "Summarize this diff"}],
)
print(resp.choices[0].message.content)

import OpenAI from "openai";

const client = new OpenAI({
  baseURL: "https://synthorai.io/v1",
  apiKey: "sk-syn-...",
});

const resp = await client.chat.completions.create({
  model: "google-tts-chirp3-hd",
  messages: [{ role: "user", content: "Summarize this diff" }],
});
console.log(resp.choices[0].message.content);

curl https://synthorai.io/v1/chat/completions \
  -H "Authorization: Bearer sk-syn-..." \
  -H "Content-Type: application/json" \
  -d '{
    "model": "google-tts-chirp3-hd",
    "messages": [{"role": "user", "content": "Hello"}]
  }'

package main

import (
	"context"
	"fmt"

	"github.com/openai/openai-go/v3"
	"github.com/openai/openai-go/v3/option"
)

func main() {
	client := openai.NewClient(
		option.WithBaseURL("https://synthorai.io/v1"),
		option.WithAPIKey("sk-syn-..."),
	)
	resp, _ := client.Chat.Completions.New(context.TODO(), openai.ChatCompletionNewParams{
		Model: "google-tts-chirp3-hd",
		Messages: []openai.ChatCompletionMessageParamUnion{
			openai.UserMessage("Summarize this diff"),
		},
	})
	fmt.Println(resp.Choices[0].Message.Content)
}

import com.openai.client.OpenAIClient;
import com.openai.client.okhttp.OpenAIOkHttpClient;
import com.openai.models.chat.completions.*;

OpenAIClient client = OpenAIOkHttpClient.builder()
    .baseUrl("https://synthorai.io/v1")
    .apiKey("sk-syn-...")
    .build();

ChatCompletion resp = client.chat().completions().create(
    ChatCompletionCreateParams.builder()
        .model("google-tts-chirp3-hd")
        .addUserMessage("Summarize this diff")
        .build());
System.out.println(resp.choices().get(0).message().content().orElse(""));

Specs & limits

Audio

Languages: ar-XA, bn-IN, bg-BG, yue-HK, hr-HR, cs-CZ, da-DK, nl-BE, nl-NL, en-AU, en-IN, en-GB, en-US, et-EE, fi-FI, fr-CA, fr-FR, de-DE, el-GR, gu-IN, he-IL, hi-IN, hu-HU, id-ID, it-IT, ja-JP, kn-IN, ko-KR, lv-LV, lt-LT, ml-IN, cmn-CN, mr-IN, nb-NO, pl-PL, pt-BR, pa-IN, ro-RO, ru-RU, sr-RS, sk-SK, sl-SI, es-ES, es-US, sw-KE, sv-SE, ta-IN, te-IN, th-TH, tr-TR, uk-UA, ur-IN and vi-VN.
Audio limits: Content limit of 5,000 total bytes per synthesize request. Default response format LINEAR16
streaming supports ALAW, MULAW, OGG_OPUS and PCM, batch adds MP3, so MP3 is not available on the streaming path. The only voice type Google's comparison table marks as streaming-capable. Generally available in the global, us and eu endpoints plus asia-southeast1, europe-west2 and asia-northeast1, but out of scope for regionalization and data residency. Billed per character including spaces and newlines, with all SSML tags except <mark> counted

Realtime

Voices: Voices are named after stars and published with a gender: Achernar, Achird, Algenib, Algieba, Alnilam, Aoede, Autonoe, Callirrhoe, Charon, Despina, Enceladus, Erinome, Fenrir, Gacrux, Iapetus, Kore, Laomedeia, Leda, Orus, Pulcherrima, Puck, Rasalgethi, Sadachbia, Sadaltager, Schedar, Sulafat, Umbriel, Vindemiatrix, Zephyr and Zubenelgenubi. A locale prefix forms the id, e.g. en-US-Chirp3-HD-Charon. Google describes the set as 30 distinct styles across many languages.
Session: Voice controls are Preview: pace via speaking_rate 0.25 to 2.0
pause tags [pause short], [pause long] and [pause] accepted only in the markup input field, never in text, and the model may disregard tags placed unnaturally
custom pronunciations in IPA or X-SAMPA
SSML support is Preview and synchronous-only, unsupported for streaming requests, with unlisted tags ignored and say-as interpret-as=expletive or bleep not supported

Model

Modalities: text → audio

Google's latest text-to-speech generation, powered by its latest generative models and described as delivering realism and emotional resonance
the comparison table names conversational agents as the intended use and lists it under Latest TTS models on the pricing page rather than Legacy. US$0.00003 per character (US$30 per 1 million characters) with the first 1 million characters free each month

per Google official docs ↗

About Google TTS Chirp 3 HD

30 distinct styles across many languages

Star-named voices and low-latency text streaming

Pace, pause tags, and custom pronunciations in preview

Google TTS Chirp 3: HD is the tier Google calls the latest generation of Text-to-Speech technology, powered by its latest generation of generative models and described as delivering realism and emotional resonance.

The comparison table names conversational agents as the intended use, and the voices page adds that these voices come in 30 distinct styles across many languages, suitable for real-time and standard applications, with advanced audio controls and low-latency real-time communication using text streaming.
That last point is the sharpest line against Standard and Neural2: Chirp 3: HD is the only voice type in that table whose streaming column reads yes.
Voices are named after stars rather than letters, Achernar, Algenib, Aoede, Charon, Kore, Leda, Puck, Sulafat, Zephyr, Zubenelgenubi and the rest, each published with a gender and combined with a locale into ids such as en-US-Chirp3-HD-Charon.
Language coverage is a published BCP-47 list running from ar-XA and bn-IN through cmn-CN, ja-JP, and sw-KE to vi-VN, and the tier is generally available in the global, us, and eu endpoints plus asia-southeast1, europe-west2, and asia-northeast1.
The default response format is LINEAR16; streaming adds ALAW, MULAW, OGG_OPUS, and PCM, while batch adds MP3 on top, so MP3 is not a streaming option here.
Its controls are its own and all still Preview: pace through speaking_rate between 0.25 and 2.0, pause tags such as [pause short] and [pause long] that work only in the markup input field and never in text, custom pronunciations in IPA or X-SAMPA, and SSML restricted to synchronous requests with unlisted tags silently ignored.
Google warns the model may disregard pause tags placed unnaturally.
Pricing is US$0.00003 per character, quoted as US$30 per 1 million characters, with the first 1 million free, and the tier sits outside regionalization and data residency scope.
Synthorai serves it over the OpenAI-compatible /v1/audio/speech endpoint.

Official Google docs ↗

FAQ

Is the Google TTS Chirp 3 HD API free to try?

Yes: new accounts get 10 trial calls and up to $1 in free credit, no card required. At $30/M input tokens, that credit alone covers roughly 8 requests of ~4K tokens against Google TTS Chirp 3 HD.

What is Google TTS Chirp 3 HD best at?

30 distinct styles across many languages; star-named voices and low-latency text streaming; pace, pause tags, and custom pronunciations in preview. See the About section for the full picture from the vendor's own release notes.

How much does Google TTS Chirp 3 HD cost?

Google TTS Chirp 3 HD costs $30 per million input tokens and $0 per million output tokens on Synthorai. That is the provider's list price, with no platform markup.

Does Google TTS Chirp 3 HD support prompt caching?

Google TTS Chirp 3 HD has no cache-read discount on Synthorai today. Prompt caching still applies to other models on the gateway; see the pricing table for cache-enabled alternatives. Provider caching comparison →

How do I get access to Google TTS Chirp 3 HD?

Point your existing OpenAI SDK at base_url="https://synthorai.io/v1", set model="google-tts-chirp3-hd", and you're done. One API key covers every model on the gateway.

Get your free API key Compare your cost →