Context Window
2M tokens
Parameters
Undisclosed
Source
Closed
Modality
Text, Vision, Code
Grok 4 Fast offers the largest practical context window at 2 million tokens. Optimized for long-document workloads.
Specifications
Technical details
Developer
xAI
Model Family
Grok 4
Parameters
Undisclosed
Context Window
2,000,000 tokens (2M)
Modality
Text, Vision, Code
Open Source
No
License
Proprietary
API Available
Yes
Release Date
September 15, 2025
Pricing
$0.20/$0.50 per M tokens