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Grok 4.20 Reasoning

xai/grok-4.20-reasoning

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 adherence, delivering consistently precise and truthful responses.

ReasoningVision (Image)Tool UseFile InputImplicit Caching
index.ts
import { streamText } from 'ai'


const result = streamText({
  model: 'xai/grok-4.20-reasoning',
  prompt: 'Why is the sky blue?'
})