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Grok 4.20 Beta Reasoning

Grok 4.20 Beta Reasoning is xAI's reasoning model in the Grok 4.20 beta generation, supporting extended thinking for complex problem-solving with low hallucination rates and strict prompt adherence.

ReasoningTool UseVision (Image)File InputImplicit CachingWeb Search
index.ts
import { streamText } from 'ai'


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

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.

Provider
Context
Latency
Throughput
Input
Output
Cache
Web Search
Per Query
Capabilities
ZDR
No Training
Release Date
xAI
Legal:Terms
•
Privacy
2M
0.5s
127tps
$1.25/M
$2.50/M
Read:
$0.2/M
Write:
—
$5/K
+ input costs
—
03/11/2026