Grok 4.3
Grok 4.3 is the latest Grok flagship — combining strong reasoning, real-time X data access, and the trademark Grok personality at the highest speed yet.
xAI · Grok
Grok 4.3
xAI's smartest and fastest model to date
Grok 4.3 is the latest Grok flagship — combining strong reasoning, real-time X data access, and the trademark Grok personality at the highest speed yet.
Key features
Grok 4.3 · AI Models
Context window
2M tokens
Max output
128K tokens
Released
April 2026
Pricing
xAI API · X Premium+
Key features
- Most intelligent Grok model with improved coding and reasoning.
- Real-time grounding via X (formerly Twitter).
- 2M-token context window inherited from Grok 4.20.
- Agentic tool-calling and multi-agent workflows supported.
Best for
Pick Grok 4.3 when you need an AI grounded in real-time public-internet data, with personality and a huge context window.
Frequently Asked Questions
How is Grok 4.3 different from GPT-5.5?
Grok 4.3 is built around real-time access to X and a 2M context window. GPT-5.5 is OpenAI's flagship with stronger general benchmarks but no native real-time web access.
Open Chat
Grok 4.3 is the latest Grok flagship — combining strong reasoning, real-time X data access, and the trademark Grok personality at the highest speed yet.