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xai/grok-tts/text-to-speech

Grok TTS is xAI's text-to-speech, reading a script of up to 15,000 characters in one of 71 preset voices across 20 languages. Speech tags such as laughs and whispers are acted out, and speed runs from 0.7 to 1.5 times.

From $0.018/1,000 characters
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Quickstart

Examples use the selected endpoint’s public parameter definitions. Replace the API key and example media, then send the request from your server.

SDKs & integrations
POSThttps://api.spicyapi.ai/api/v1/jobs/createTask

API authentication

Keep the API key in the server environment variable SPICY_API_KEY. Use Bearer authentication and Content-Type: application/json for JSON requests.

Authorization: Bearer $SPICY_API_KEY
# Generate the idempotency key once; reuse it when retrying after a lost response.
export SPICY_IDEMPOTENCY_KEY="${SPICY_IDEMPOTENCY_KEY:-$(uuidgen)}"
curl -X POST https://api.spicyapi.ai/api/v1/jobs/createTask \
  -H "Authorization: Bearer $SPICY_API_KEY" \
  -H "Content-Type: application/json" \
  -H "Idempotency-Key: $SPICY_IDEMPOTENCY_KEY" \
  -d '{
  "model": "xai/grok-tts/text-to-speech",
  "input": {
    "text": "Welcome back. Your files finished rendering a minute ago and are ready to download.",
    "bitrate": 128000,
    "language": "auto",
    "voice_id": "eve",
    "sample_rate": 24000,
    "output_format": "mp3"
  }
}'

# Copy data.taskId from the response into TASK_ID, then poll the status.
TASK_ID="TASK_ID_FROM_RESPONSE"
curl "https://api.spicyapi.ai/api/v1/jobs/recordInfo?taskId=$TASK_ID" \
  -H "Authorization: Bearer $SPICY_API_KEY"

Generated from this model’s input schema — the same one the API validates every request against.

Input parameters

Place these fields inside the request body’s input object. Names and types match the API. Do not assume a default when none is specified.

textstringRequired

The words to be spoken, exactly as written, with optional speech tags such as [laugh] or <whisper>…</whisper>. 1 to 15,000 characters. Billed per 1,000 characters, counting spaces, punctuation and tags.

Default
Not specified
Constraints
minLength:1
maxLength:15000
optimize_streaming_latencyintegerOptional

Streaming latency level from the model: 0 (default) keeps the best audio quality; 1 uses a smaller first audio chunk for lower time-to-first-audio, with a minor quality trade-off at chunk boundaries; 2 uses the smallest first chunk, with a more noticeable trade-off. Does not change the price.

Default
0
Allowed values
012
text_normalizationbooleanOptional

When on, written forms such as numbers, abbreviations and symbols are converted to their spoken form before reading. Off by default. Does not change the price.

Default
false
bitrateintegerOptional

MP3 bit rate in bits per second: 32000 to 192000, default 128000. Only applies when output_format is mp3. Does not change the price.

Default
128000
Allowed values
320006400096000128000192000
sample_rateintegerOptional

Sample rate in Hz: 8000, 16000, 22050, 24000 (default), 44100 or 48000. Use 8000 with mulaw or alaw for phone lines, 44100 or 48000 for studio work. Does not change the price.

Default
24000
Allowed values
80001600022050240004410048000
output_formatstringOptional

Audio encoding: mp3 (default), wav, or the header-less streams pcm, mulaw and alaw for phone systems. Does not change the price.

Default
"mp3"
Allowed values
"mp3""wav""pcm""mulaw""alaw"
speednumberOptional

Speaking speed from 0.7 (slower) to 1.5 (faster); default 1.0. Does not change the price.

Default
1
Constraints
minimum:0.7
maximum:1.5
languagestringOptional

The reading language as a language code, or auto (default) to detect it from the script. Set it when a short or mixed script comes out in the wrong language. Voices for Dutch, Polish, Swedish, Finnish, Danish and Thai have no code of their own: keep auto. Does not change the price.

Default
"auto"
Allowed values
"auto""en""zh""ar-EG""ar-SA""ar-AE""bn""fr""de""hi""id""it""ja""ko""pt-BR""pt-PT""ru""es-MX""es-ES""tr""vi"
voice_idstringOptional

One of 71 preset voices, labelled with name, gender and language. Eve (default), Ara, Leo, Rex and Sal speak every supported language; the others are tuned for one language. Does not change the price.

Default
"eve"
Allowed values
"ara""eve""leo""rex""sal""jpi39icg""d18jlf6v""33g9t0jl""26w6ihxi""dr8gqysu""wy0m9l5w""om17cury""x7avnu1k""bcs7l2c3""hqxr4yub""h27ltdnz""89q2pnko""73xd5dum""0p0rt7o1""hbxkrnwm""69smp8rm""yis75yfp""ekhwx401""jupvcf34""0hhfxxqq""0ih5oi34""gwnexu6y""97zmdc6s""fc7de6afcf6c""7a9ee820b342""0895a5b8ce5c""f8cf5c2c78d4""96819d0bd28d""79f3a8b96d43""78a495fdbb39""e22152e06fd8""490ea3be50b1""1f046a033914""dfe7b9e7d217""c3a2c594479e""83c6f4fea98e""34fd4dce1ba3""d634b6da3d3b""670a0c3ac005""182a91893636""d0cb9ff07d95""b1a7441b97a1""bf9fe5b5f981""b5ae17439907""a0401c9101f8""23be42535a45""abfbdf26f115""6da5baee46d0""3d030bc92a87""a13662ba951c""58d27475085e""247783ebdd51""244e27b39200""97fabd54445f""37329fd8895a""2badb5f46b1e""1b12d5daee6b""908c4626660f""4ff93971bfdc""70013edeb8e8""35c8d7f60dc8""23468361b4ef""458705c07139""41321eb41295""40f31906b23d""3a7889066fa2"

Track the task

HTTP 202 means the task was accepted, not completed. Save the returned taskId and query that task. Do not create another task while waiting for its result.

Accepted response
HTTP/1.1 202 Accepted
Location: /api/v1/jobs/recordInfo?taskId=job_01k3m8x9q2z4v7n5p6r8s0t1w3

{
  "code": 200,
  "msg": "success",
  "request_id": "req_example_create",
  "data": {
    "taskId": "job_01k3m8x9q2z4v7n5p6r8s0t1w3",
    "state": "queued",
    "estimatedCost": "0.750000"
  }
}

The accepted response includes the estimate so your app can show the same amount in task history and billing.

Read the job
curl --get "https://api.spicyapi.ai/api/v1/jobs/recordInfo" \
  --data-urlencode "taskId=$TASK_ID" \
  -H "Authorization: Bearer $SPICY_API_KEY"

Start polling at about 2 seconds and gradually increase the interval. Stop at a terminal state. After a connection failure, query the original taskId. Retry creation only with the original idempotency key and body.

Or let the callback find you
import { verifyWebhook } from "@spicyapi/sdk";

// express.raw keeps the bytes we signed; express.json never matches.
app.post("/hooks/spicy", express.raw({ type: "application/json" }), (req, res) => {
  const { payload } = verifyWebhook({
    rawBody: req.body,
    timestamp: req.header("X-Webhook-Timestamp"),
    signature: req.header("X-Webhook-Signature"),
    payloadVersion: Number(req.header("X-Webhook-Payload-Version")),
    secret: process.env.SPICY_WEBHOOK_SECRET,
  });
  res.status(200).end();
  void handleFinishedTask(payload);
});

Pass callBackUrl when you create the task and the finished record is POSTed to you — no polling loop at all. Every delivery carries X-Webhook-Timestamp, X-Webhook-Signature and X-Webhook-Payload-Version. The signature is a base64 HMAC-SHA256 over taskId.timestamp.sha256(body), so it must be checked against the raw bytes: parsing the JSON and re-serialising it changes them and the check will fail. Failed deliveries are retried, so the same taskId can arrive twice — make the handler idempotent. Answer 2xx first and do the work afterwards; a slow handler is treated as a failed delivery.

Read the result

Consume output only when state is succeeded. On failure, use errorCode, errorMessage and request_id to investigate. Example costs and states do not represent an actual bill.

Completed response example
{
  "code": 200,
  "msg": "success",
  "request_id": "req_example_record",
  "data": {
    "taskId": "job_01k3m8x9q2z4v7n5p6r8s0t1w3",
    "model": "xai/grok-tts/text-to-speech",
    "state": "succeeded",
    "output": {
      "assets": [
        {
          "key": "tasks/2026/08/28/job_01k3m8x9q2z4v7n5p6r8s0t1w3/3f7a1c9e5b2d48f0a6c1e3d5b7f9a1c3.mp3",
          "mime": "audio/mpeg",
          "url": "https://example.r2.cloudflarestorage.com/results/job_01k3m8x9q2z4v7n5p6r8s0t1w3/result.mp3?X-Amz-Signature=SIGNATURE_FROM_RESPONSE",
          "expiresAt": "2026-08-28T12:20:08.000Z"
        }
      ]
    },
    "cost": "0.750000",
    "settled": true,
    "createdAt": "2026-08-28T12:00:00Z",
    "completedAt": "2026-08-28T12:00:30Z"
  }
}

For each available asset, open or download assets[].url directly without an API Authorization header. The signed URL expires at expiresAt; poll the task again to refresh it while the asset remains within its retention period. A pending or unavailable asset has no URL. Treat signed URLs as private.

SDKs & integrations

Use SpicyAPI in your app, terminal, AI assistant or visual workflow. Choose a setup guide below.

SDKs
TypeScript · Python · Go · PHP · Java
CLI
Terminal commands and automation scripts.
MCP
Claude Code · Cursor · Codex
Agent Skill
Reusable instructions for your AI assistant.
n8n
Self-hosted community nodes and importable HTTP Request templates for n8n Cloud.
ComfyUI
Image, video and audio workflows on a node canvas.

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Browse ready-to-use workflows

Use it in ComfyUI

Install the SpicyAPI nodes from ComfyUI Manager or with the command below, then search for Grok TTS · Text to Speech on the canvas. The node has the same options as this page and shows its price before it runs.

cd ComfyUI/custom_nodes
git clone https://github.com/spicyapi-ai/comfyui-spicyapi
Workflow examplesSetup guideSource on GitHub