What Grok 4 Heavy is
Grok 4 Heavy is xAI's flagship frontier model as of September 2026, succeeding the Grok 4 / Grok 4.6 line and offered through the SuperGrok Heavy subscription tier. The broader xAI stack also includes Grok (chat), Grok Build (developer tooling), Grok Imagine (image/video), Grok Voice, Grok Bot, and Grokipedia, with xAI pursuing business, government, and developer customer segments.
Funding snapshot
Series E $20B at $200B+ valuation (2025)
Key features
- Grok 4.6 referenced as 'Our new model' on x.ai (Grok 4 Heavy tier in SuperGrok Heavy plan)
- Real-time access to X (Twitter) data
- Image and video generation via Grok Imagine
- Voice mode, Grok Bot, and Grokipedia
Where it lives
Grok web app (grok.com) and x.aiX (Twitter) social platformiOS and Android appsxAI API (grok-4 / grok-4.6 model names)
Alternatives to consider
Full comparisonRelated reading
8 pieces from AIUnpacker on Grok 4 Heavy
Guides and articles
7
Guide
10 Best Grok Prompts for Online Marketing in 2026
Guide
10 Grok Prompts for Deeper Research
Guide
Grok for Word: xAI's New Microsoft Word AI Assistant Explained
Guide
Grok Models Come to Databricks: What Developers and Enterprises Should Know
Guide
Grok Comes to Amazon Bedrock: What It Means for Enterprise AI
Guide
Grok Imagine Video 1.5: xAI's Faster AI Video Generator Is Here
Guide
Grok Imagine 1.5 Preview: xAI's New AI Video Model Explained
Sources & media
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