xAI · Single modalityReleased 2026-04-23

grok-voice-think-fast-1.0

xai/grok-voice-think-fast-1.0 id

Build real-time voice applications powered by Grok. Stream audio and text bidirectionally via WebSocket for voice assistants, phone agents, and interactive voice systems.

Type

Use grok-voice-think-fast-1.0

# Drop-in OpenAI-compatible client
$ import { generateText } from 'ai'
$ 
$ const { text } = await generateText({
$   model: 'xai/grok-voice-think-fast-1.0',
$   baseURL: 'https://synapse.garden/api/v1',
$   apiKey: process.env.MG_KEY,
$   prompt: 'Why is the sky blue?',
$ })

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CONTEXT WINDOW

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MAX OUTPUT

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INPUT · PER M

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OUTPUT · PER M

PRICING

List prices, every modality.

Rate	Per million tokens · USD
Input	—
Output	—

Honest list pricesHow we calculate prices

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grok-sttTranscribe audio to text in 25 languages with batch and streaming modes.
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grok-ttsGenerate speech with 5 expressive voices, speech tags, and telephony codecs.
Input
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grok-4.20-multi-agent (beta)Multiple agents collaborate in parallel to perform deep research tasks.REASONINGTOOLSWEBAGENTS
Input
$1.38/M
Output
$2.75/M
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grok-4.20-non-reasoning-betaGrok 4.20 Beta is the newest flagship model from xAI with industry-leading speed and agentic tool calling capabilities. It combines the lowest hallucination rate on the market with strict prompt adherance, delivering consistently precise and truthful responses.TOOLSWEB
Input
$1.38/M
Output
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grok-4.20-reasoning (beta)Grok 4.20 Beta is the newest flagship model from xAI with industry-leading speed and agentic tool calling capabilities. It combines the lowest hallucination rate on the market with strict prompt adherance, delivering consistently precise and truthful responses.REASONINGTOOLSWEB
Input
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Output
$2.75/M
Context
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grok-4.20Grok 4.20 Beta is the newest flagship model from xAI with industry-leading speed and agentic tool calling capabilities. It combines the lowest hallucination rate on the market with strict prompt adherence, delivering consistently precise and truthful responses.TOOLSWEBLONG-CTX
Input
$1.38/M
Output
$2.75/M
Context
2M
grok-4.20-multi-agentMultiple agents collaborate in parallel to perform deep research tasks.REASONINGTOOLSWEBAGENTSLONG-CTX
Input
$1.38/M
Output
$2.75/M
Context
2M
grok-4.20-reasoningGrok 4.20 Beta is the newest flagship model from xAI with industry-leading speed and agentic tool calling capabilities. It combines the lowest hallucination rate on the market with strict prompt adherence, delivering consistently precise and truthful responses.REASONINGTOOLSWEBLONG-CTX
Input
$1.38/M
Output
$2.75/M
Context
2M

FAQ · GROK-VOICE-THINK-FAST-1.0

Frequently asked

01 / 04

How do I call grok-voice-think-fast-1.0 from my code?

Use the OpenAI or Anthropic SDK and point baseURL at https://synapse.garden/api/v1. Set model: ‘xai/grok-voice-think-fast-1.0’ and supply your Synapse Garden API key. No code changes beyond the base URL.

02 / 04

How much does grok-voice-think-fast-1.0 cost?

Pricing varies by usage type — see the table above for the current rates.

03 / 04

What's the context window for grok-voice-think-fast-1.0?

Context window varies — check the live spec sheet at the top of this page.

04 / 04

Do I need a separate Anthropic or OpenAI account?

No. Synapse Garden is the single API surface — one key gives you OpenAI, Anthropic, Google, Meta, Mistral, DeepSeek, xAI, Cohere, and more. Billing, rate limits, and audit logs are unified.

READY

Try grok-voice-think-fast-1.0 in three minutes.

Sign up, create a key, drop our base URL into your existing client. The free tier includes a million tokens every month — no credit card.

Start free Quickstart