xAI: Grok Voice TTS 1.0

Convert text into spoken audio with a single API call. The API supports a rich set of expressive voices, inline speech tags for fine-grained delivery control, and output formats from high-fidelity MP3 to telephony-optimized μ-law.

Model lab: xAI
Model family: —

Modalitiestext → audio

Context window15,000

Maximum output15,000

Input · Up to 15000 characters per requestUSD 12 / 1M characters

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Quickstart

Use your Moduck API Key, set the API base URL to https://api.moduck.ai/v1, and set the model parameter to xai/grok-voice-tts-1.0.

import os
import requests

base_url = "https://api.moduck.ai/v1"
api_key = os.environ["MODUCK_API_KEY"]
model_id = "xai/grok-voice-tts-1.0"

response = requests.post(
    f"{base_url}/chat/completions",
    headers={
        "Authorization": f"Bearer {api_key}",
        "Content-Type": "application/json",
    },
    json={
        "model": model_id,
        "messages": [{"role": "user", "content": "Hello!"}],
        "stream": False,
    },
    timeout=60,
)
response.raise_for_status()
print(response.json())

Use the familiar OpenAI-style chat request format to make model integration easier.

Grok Voice TTS 1.0 API Pricing

Type	Price information
Input · Up to 15000 characters per request	USD 12 / 1M characters

Performance

Measured on the Moduck gateway across live traffic, hour by hour over the last 24 hours. Time to first token is how long before anything appears; throughput is how fast the answer is written after that; end-to-end latency is the whole round trip. Figures are medians unless the card says otherwise.

Performance trends

Audio throughput1.5 audio min/minCurrent

Queue wait0.4 sCurrent

Completion time8.5 sCurrent

Audio throughput

Current1.5 audio min/min

Window average1.5 audio min/min

Queue wait

Current0.4 s

Window average0.5 s

Completion time

Current8.5 s

Window average9.0 s

Tail completion time (P99)

Current18.0 s

Window average18.6 s

Retry rate

Current0.8%

Window average1.0%

Error rate

Current0.0%

Window average0.1%

Availability

Uptime is the share of time at least one provider serving this model responded. Availability is stricter: the share of requests actually served. A provider that answers but fails part of the traffic lowers availability without lowering uptime. Both cover the last three days.

Uptime100%At least one provider responded

Availability100%Requests actually served

Error rate0%Share of failed requests

Served requests, hour by hour

24 hours agoNow

Grok Voice TTS 1.0 Compare models

Model	Input price	Output price	Context window	Capabilities
Grok Voice TTS 1.0This page	USD 12 / 1M characters · Up to 15000 characters per request	Not billed on output	15,000	Audio output
Gemini 3.1 Flash TTS Preview	USD 0.8 / 1M tokens	USD 16 / 1M tokens	8,192	Audio output
Gemini 2.5 Flash TTS	USD 0.4 / 1M tokens	USD 8 / 1M tokens	32,768	Audio output
Gemini 2.5 Pro TTS	USD 0.8 / 1M tokens	USD 16 / 1M tokens	32,768	Audio output
GPT-Realtime-2.1	USD 3.2 / 1M tokens	USD 19.2 / 1M tokens	128,000	Audio output · Reasoning · Tool calling

Model specifications

Input: text
Output: audio
Context window: 15,000
Maximum output: 15,000
Release date: 2026-07-31
Attachments: No
Reasoning: No
Tool calling: No
Temperature setting: No
Open weights: No

Frequently asked questions

What is Grok Voice TTS 1.0 for?

What inputs and outputs does Grok Voice TTS 1.0 support?

Recorded inputs: text; outputs: audio.

How is Grok Voice TTS 1.0 priced?

The pricing table shows the current recorded Moduck price. For example: Input · Up to 15000 characters per request USD 12 / 1M characters. See the pricing table for all units, variants, and conditions.

What specifications are recorded for Grok Voice TTS 1.0?

Current model records list Context window 15,000 tokens; Maximum output 15,000 tokens.

What model parameter does the Quickstart use?

The example uses xai/grok-voice-tts-1.0. This value comes from the page identifier and is not confirmed as a callable Moduck public ID.

Can I call this model through the Moduck API now?

This page has no verified Moduck API call for this model. A Quickstart example or reserved ID does not establish access; check the models available to your account.