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?'})More models by xAI
| Model |
|---|
| 1M | 1.1s | 69tps | $1.25/M | $2.50/M | Read: $0.2/M Write: — | $5/K + input costs | — |  | 04/30/2026 | ||||
| 2M | 0.7s | 354tps | $1.25/M | $2.50/M | Read: $0.2/M Write: — | $5/K + input costs | — |  | 03/09/2026 | ||||
| 2M | 0.4s | 65tps | $1.25/M | $2.50/M | Read: $0.2/M Write: — | $5/K + input costs | — | | 03/09/2026 | ||||
| 2M | 3.2s | 1124tps | $1.25/M | $2.50/M | Read: $0.2/M Write: — | $5/K + input costs | — | | 03/09/2026 | ||||
| 1M | 4.7s | 135tps | $0.20/M | $0.50/M | Read:$0.05/M Write:— | — | — | | 07/09/2025 | ||||
| 1M | 0.3s | 33tps | $0.20/M | $0.50/M | Read:$0.05/M Write:— | — | — | | 07/09/2025 |