Grok 4.3
xAI's reasoning model with native real-time web/X search and a 1M context.
Grok 4.3 specifications
| Provider | xAI |
|---|---|
| Context window | 1,000,000 tokens (1.0M) |
| Input price | $1.25 / 1M tokens |
| Output price | $2.50 / 1M tokens |
| Inputs | Text, Images |
| Reasoning mode | Yes |
| Vision (image input) | Yes |
| Tool / function calling | Yes |
| Native real-time web | Yes |
| Open-weight | No |
| Released | April 2026 |
| Knowledge cutoff | December 2025 |
Pricing & context web-verified June 2026 — confirm on xAI's pricing page.
What Grok 4.3 is best for
- Real-time research and current events
- Agentic tool use (web, code, image generation)
- Reasoning-heavy analysis
How to prompt Grok 4.3
- Lean on its live web/X search for anything time-sensitive — it pulls current data.
- Use its deliberate reasoning mode for math, planning, and multi-step analysis.
- It exposes tools (search, code, image gen) on one surface — let it pick the right one.
Work with Grok 4.3
- Build an optimized prompt with the xAI prompt generator.
- Estimate cost with the token counter & cost calculator, or compare every model on the AI model comparison page.
- Related reading: Best Grok Prompts 2026 · How To Use Grok.
- Official: grok.com
Frequently asked questions
What is Grok 4.3's context window?
Grok 4.3 has a 1,000,000-token context window (about 1.0M tokens) — the maximum amount of text it can consider at once.
How much does Grok 4.3 cost?
Via the xAI API, Grok 4.3 costs $1.25 per 1M input tokens and $2.50 per 1M output tokens (web-verified June 2026). Output tokens cost more, so the length of the model's reply usually drives the bill.
Is Grok 4.3 multimodal?
Yes — Grok 4.3 accepts Text, Images as input, not just text.
Is Grok 4.3 open-weight?
No — Grok 4.3 is available only through the xAI API, not as downloadable weights.