Synapse Garden
xAI · Single modalityReleased 2025-02-17

grok-3-fast

xai/grok-3-fast id

xAI's flagship model that excels at enterprise use cases like data extraction, coding, and text summarization. Possesses deep domain knowledge in finance, healthcare, law, and science. The fast model variant is served on faster infrastructure, offering response times that are significantly faster than the standard. The increased speed comes at a higher cost per output token.

Tool use
Type
Use grok-3-fast
# Drop-in OpenAI-compatible client
$ import { generateText } from 'ai'
$ 
$ const { text } = await generateText({
$   model: 'xai/grok-3-fast',
$   baseURL: 'https://synapse.garden/api/v1',
$   apiKey: process.env.MG_KEY,
$   prompt: 'Why is the sky blue?',
$ })
131.1K
CONTEXT WINDOW
131.1K
MAX OUTPUT
$5.50/M
INPUT · PER M
$27.50/M
OUTPUT · PER M
PRICING

List prices, every modality.

RatePer million tokens · USD
Input$5.50/M
Output$27.50/M
Cache read$1.38/M
Honest list pricesHow we calculate prices
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FAQ · GROK-3-FAST

Frequently asked

01 / 04

How do I call grok-3-fast from my code?

Use the OpenAI or Anthropic SDK and point baseURL at https://synapse.garden/api/v1. Set model: ‘xai/grok-3-fast’ and supply your Synapse Garden API key. No code changes beyond the base URL.

02 / 04

How much does grok-3-fast cost?

Input: $5.50/M per million tokens. Output: $27.50/M per million tokens. The free tier includes a million tokens every month at no cost.

03 / 04

What's the context window for grok-3-fast?

grok-3-fast supports a context window of 131.1K tokens, with a maximum output of 131.1K tokens.

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-3-fast 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 freeQuickstart