Grok 4.3 on AI Gateway

Source: Vercel Blog

Overview

Grok 4.3 is now available on the Vercel AI Gateway. The model has a December 2025 knowledge cutoff and a 1 M‑token context window, with improvements in accuracy, tool calling, and instruction following.

Usage

To use Grok 4.3, set the model to xai/grok-4.3 in the AI SDK.

import { streamText } from 'ai';

const result = streamText({
  model: 'xai/grok-4.3',
  prompt: 'Analyze this dataset and summarize the key trends.',
});

Features

• Knowledge cutoff: December 2025
• Context window: 1 M tokens
• Enhanced: accuracy, tool calling, instruction following
• Unified API: call models, track usage & cost, configure retries, failover, and performance optimizations for higher‑than‑provider uptime
• Built‑in capabilities:
  • Custom reporting
  • Observability
  • Bring Your Own Key support
  • Intelligent provider routing with automatic retries

Resources

• Learn more about the AI Gateway
• View the AI Gateway model leaderboard
• Try Grok 4.3 in the model playground