Grok 4.20 Reasoning
Grok 4.20 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.
ReasoningVision (Image)Tool UseFile InputImplicit CachingWeb Search
index.ts
import { streamText } from 'ai'
const result = streamText({ model: 'xai/grok-4.20-reasoning', prompt: 'Why is the sky blue?'})More models by xAI
| Model |
|---|
| 1M | 0.9s | 82tps | $1.25/M | $2.50/M | Read: $0.2/M Write: — | $5/K + input costs | — |  | 04/30/2026 | ||||
| 2M | 2.4s | 1130tps | $1.25/M | $2.50/M | Read: $0.2/M Write: — | $5/K + input costs | — | | 03/11/2026 | ||||
| 2M | 0.5s | 99tps | $1.25/M | $2.50/M | Read: $0.2/M Write: — | $5/K + input costs | — | | 03/11/2026 | ||||
| 2M | 0.4s | 95tps | $1.25/M | $2.50/M | Read: $0.2/M Write: — | $5/K + input costs | — |  | 03/09/2026 | ||||
| 1M | 0.4s | 70tps | $0.20/M | $0.50/M | Read:$0.05/M Write:— | — | — | | 07/09/2025 | ||||
| 1M | 6.6s | 103tps | $0.20/M | $0.50/M | Read:$0.05/M Write:— | — | — | | 07/09/2025 |