Grok Voice Think Fast 1.0
Grok Voice Think Fast 1.0 is SpaceXAI's realtime voice model for speech-to-speech agents, streaming audio bidirectionally over WebSocket through Vercel AI Gateway. Your use is subject to SpaceXAI's Terms & Privacy Policies.
- Price
- $3.00, Per session hourPlus $0.004 per client message
import { gateway } from '@ai-sdk/gateway';
export async function POST() { const { token, url } = await gateway.experimental_realtime.getToken({ model: 'spacexai/grok-voice-think-fast-1.0', });
return Response.json({ token, url, tools: [] });}Copy link to headingPlayground
Try out Grok Voice Think Fast 1.0 by SpaceXAI. Usage is billed to your team at API rates. Free users (those who haven't made a payment) get $5 of credits every 30 days.
Grok Voice Think Fast 1.0Voice agent
Talk to a realtime agent. It listens to your voice and replies with audio.
Start the session and ask the agent something.
Copy link to headingProviders
Route requests across multiple providers. Copy a provider slug to set your preference. Visit the docs for more info. Using a provider means you agree to their terms, listed under Legal.
Copy link to headingMore models by SpaceXAI
| Model |
|---|
| 500K | 3.2 s | 67 tps | $2/M+1 more | $6/M+1 more | Read$0.50/M | $5/K+2 more | +2 | | 09/21/2026 | |||||
| 500K | 2.7 s | 69 tps | $2/M+1 more | $6/M+1 more | Read$0.50/M | $5/K+2 more | +2 | | 08/12/2026 | |||||
| 500K | 2.0 s | 64 tps | $2/M+1 more | $6/M+1 more | Read$0.30/M | $5/K+2 more | +4 | | 07/08/2026 | |||||
| 256K | 1.2 s | 240 tps | $1/M+1 more | $2/M+1 more | Read$0.20/M | $5/K+2 more | +3 | | 05/20/2026 | |||||
| 1M | 1.9 s | 102 tps | $1.25/M+1 more | $2.50/M+1 more | Read$0.20/M | $5/K+2 more | +4 |  | 04/30/2026 | |||||
| 1M | 1.0 s | 165 tps | $0.20/M | $0.50/M | Read$0.05/M | — | +3 | | 11/19/2025 |
Copy link to headingAbout Grok Voice Think Fast 1.0
Grok Voice Think Fast 1.0 is SpaceXAI's realtime voice model, released April 23, 2026 and available through AI Gateway. Grok Voice Think Fast 1.0 handles full-duplex, speech-to-speech conversation: audio streams in, and spoken replies stream back with low latency. Background reasoning lets Grok Voice Think Fast 1.0 think through hard queries while the conversation keeps moving. SpaceXAI positions the model for customer support, sales, and other high-stakes voice workflows.
Grok Voice Think Fast 1.0 captures structured data from natural speech, including email addresses, street addresses, phone numbers, and account numbers, even through accents and mid-sentence corrections. Tool calling works inside the session, so a voice agent can act on external systems mid-conversation. SpaceXAI reports support for conversations in more than 25 languages and robustness under telephony conditions like noise and interruptions.
Through AI Gateway, a server route mints a short-lived token with gateway.experimental_realtime.getToken, so your API key never reaches the client. In the browser, the useRealtime hook from @ai-sdk/react manages the WebSocket connection, microphone capture, and audio playback. In Node.js, the realtime model acts as a codec for a WebSocket you drive yourself. Session config covers voice, turn detection, instructions, and tools. Realtime support ships on the canary releases of the AI SDK.
Copy link to headingWhat To Consider When Choosing a Provider
- Configuration: Grok Voice Think Fast 1.0 supports speech-to-speech only. Transcription and translation aren't handled in realtime sessions, so use
grok-sttfor recorded audio. Image input isn't supported either. - Configuration: AI Gateway enforces session limits: 25 minutes maximum duration, a five-minute idle timeout, and a cap on concurrent sessions per team. Reconnecting doesn't resume a previous session, so replay any context you need after a drop. Realtime support is experimental and ships on canary AI SDK releases, so expect API changes.
- Zero Data Retention: Zero Data Retention is available for this model. It is offered on a per-provider and model basis. See the documentation for details.
- Authentication: AI Gateway authenticates requests using an API key or OIDC token. You do not need to manage provider credentials directly.
Copy link to headingWhen to Use Grok Voice Think Fast 1.0
Best for
- Voice Assistants and Agents: Full-duplex conversation with spoken replies in real time
- Phone and Support Lines: Robust handling of noise, accents, and interruptions on telephony audio
- Structured Data Capture: Collects emails, addresses, and account numbers from natural speech
- Tool-Calling Voice Workflows: Session tools let agents act on external systems mid-conversation
- Multilingual Voice Apps: Conversations in more than 25 languages
Consider alternatives when
- Recorded Audio Transcription:
grok-stttranscribes files, since realtime sessions are speech-to-speech only - One-Way Speech Output:
grok-ttsgenerates narration without a live session - Long Uninterrupted Sessions: AI Gateway caps realtime sessions at 25 minutes, so plan reconnect logic
Copy link to headingConclusion
Grok Voice Think Fast 1.0 brings SpaceXAI's realtime voice stack to AI Gateway. Speech streams both directions over WebSocket, with background reasoning, tool calling, and structured data capture built for production voice agents. Mint a token on the server, connect with the useRealtime hook, and see live pricing on this page.
Copy link to headingFrequently Asked Questions
How do I connect to Grok Voice Think Fast 1.0 through AI Gateway?
Add a server route that mints a short-lived token with
gateway.experimental_realtime.getToken. In the browser, theuseRealtimehook from@ai-sdk/reacthandles the WebSocket connection, microphone capture, and playback. In Node.js, drive a WebSocket yourself using the realtime model as a codec.Can Grok Voice Think Fast 1.0 transcribe or translate audio?
No. Grok Voice Think Fast 1.0 supports speech-to-speech only. Use
grok-sttto transcribe recorded audio.What session limits apply to Grok Voice Think Fast 1.0?
AI Gateway caps sessions at 25 minutes, closes idle sessions after five minutes, expects a first client message within 30 seconds, and rejects messages over 256 KB. Teams also have a concurrent session limit.
What is background reasoning in Grok Voice Think Fast 1.0?
Background reasoning lets Grok Voice Think Fast 1.0 work through hard queries while the conversation continues, so spoken replies stay responsive during complex, multi-step requests.
What languages does Grok Voice Think Fast 1.0 support?
SpaceXAI reports support for conversations in more than 25 languages, with robustness under telephony conditions like noise, accents, and interruptions.
What does Grok Voice Think Fast 1.0 cost?
See the pricing section on this page for today's rates. AI Gateway exposes current pricing for Grok Voice Think Fast 1.0.
How do I authenticate with Grok Voice Think Fast 1.0 through Vercel AI Gateway?
Use your Vercel AI Gateway API key on the server with
spacexai/grok-voice-think-fast-1.0as the model identifier.getTokenexchanges the key for a single-use, short-lived client secret, so the key never reaches the browser.Does Vercel AI Gateway support Zero Data Retention for Grok Voice Think Fast 1.0?
Yes, Zero Data Retention is available for this model. Zero Data Retention is offered on a per-provider basis. See https://vercel.com/docs/ai-gateway/capabilities/zdr for details.