Grok 4.3
Grok 4.3 is a xAI reasoning model with an improved architecture and a December 2025 knowledge cutoff, matching the scale of Grok 4.20 within a context window of 1M tokens.
ReasoningTool UseImplicit CachingFile InputVision (Image)Web Search
index.ts
import { streamText } from 'ai'
const result = streamText({ model: 'xai/grok-4.3', prompt: 'Why is the sky blue?'})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 |
|---|
 xAI | 1M | 0.9s | 88tps | $1.25/M | $2.50/M | Read: $0.2/M Write: — | $5/K + input costs | — | +4 | 04/30/2026 | ||
 Google Vertex AI | 1M | 1.1s | $1.25/M | $2.50/M | Read: $0.2/M Write: — | $5/K + input costs | — | +3 | 04/30/2026 |