xai/grok-4.20-reasoning idGrok 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.
# Drop-in OpenAI-compatible client$ import { generateText } from 'ai'$$ const { text } = await generateText({$ model: 'xai/grok-4.20-reasoning',$ baseURL: 'https://synapse.garden/api/v1',$ apiKey: process.env.MG_KEY,$ prompt: 'Why is the sky blue?',$ })
| Rate | Per million tokens · USD |
|---|---|
| Input | $1.38/M |
| Output | $2.75/M |
| Cache read | $0.220/M |
Use the OpenAI or Anthropic SDK and point baseURL at https://synapse.garden/api/v1. Set model: ‘xai/grok-4.20-reasoning’ and supply your Synapse Garden API key. No code changes beyond the base URL.
Input: $1.38/M per million tokens. Output: $2.75/M per million tokens. The free tier includes a million tokens every month at no cost.
grok-4.20-reasoning supports a context window of 2M tokens, with a maximum output of 2M tokens.
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.
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.