Grok Voice 2.0
Build intelligent voice agents that handle customer support, drive sales, and deliver real customer outcomes. One API to tune and deploy natural-sounding agents that follow your procedures and use your tools.
A Complete Voice Agent. One API.
Real-time voice agents
Build full-duplex agents that listen while they speak, take interruptions in stride, and reach first audio in under a second. There's no STT → LLM → TTS chain to assemble, no vendors to keep in sync, and no latency lost between the hops.
Human-like agents
Warm, expressive, and natural voice agents that can carry real conversations. Support for 25 languages with 25 stock voices and the ability to create new custom voices on the fly.
Grounded in your processes and tools
Hand agents your playbook and tools so it can reason through complex, multi-step requests just like a human would.
How to get access to the Grok Voice API
Send recorded audio over HTTP for a one-shot spoken reply, or open a WebSocket for a live conversation. The client libraries handle the queue protocol and the realtime framing.
import { fal } from "@fal-ai/client";
const result = await fal.subscribe("xai/grok-voice", {
input: {
audio_url: "https://example.com/question.wav",
prompt: "You are a concise, friendly voice assistant.",
voice: "aurora",
},
logs: true,
onQueueUpdate: (update) => {
if (update.status === "IN_PROGRESS") {
update.logs.map((log) => log.message).forEach(console.log);
}
},
});
// The agent's spoken reply (WAV) plus its transcript
console.log(result.data.audio.url);
console.log(result.data.text);
Common questions about Grok Voice
What is Grok Voice?
Grok Voice is xAI's speech-to-speech model that supports real-time and one-shot voice agents. On fal.ai it comes as two endpoints: a one-shot API that takes an uploaded recording and returns the agent's spoken reply as a WAV file plus its transcript, and a realtime WebSocket API for live, bidirectional conversations.
How intelligent is Grok Voice?
Grok Voice 2.0 is widely regarded as the most intelligent voice model in the market. Public benchmarks from independent evaluators like Artificial Analysis show that Grok Voice leads frontier models on reasoning, agentic performance, speed, and overall ability to resolve customer issues.
How much does Grok Voice cost on fal?
$0.00083 per second of audio, about $0.05 per minute for both API endpoints. The model is pay-per-use with no minimums.
How do I get started?
Install the fal.ai SDK (Python or JavaScript), grab an API key from your dashboard, and call the xai/grok-voice endpoint in a few lines of code, or open a WebSocket to xai/grok-voice/realtime with the realtime client. The API is serverless, so there is no infrastructure to set up. Check the API documentation for every available parameter.
Can I use Grok Voice for commercial projects?
Yes. Content generated through the fal.ai API can be used in commercial projects. Check fal.ai's terms of service for full details on usage rights and licensing.
Get in touch about Grok Voice
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