 Grok 4 Fast | |
|---|---|
Model Provider The organization behind this AI's development | XAI |
Input Context Window Maximum input tokens this model can process at once | 2M tokens |
Output Token Limit Maximum output tokens this model can generate at once | 30K tokens |
Release Date When this model first became publicly available | September 19, 2025 8 days ago September 19th, 2025 |
| Grok 4 Fast | |
|---|---|
Input Token Cost Cost per million input tokens | $0.20 per million tokens |
Output Token Cost Cost per million output tokens | $0.50 per million tokens |
| Grok 4 Fast | |
|---|---|
Input Types Supported input formats | textimage |
Output Types Supported output formats | text |
Tokenizer Text encoding system | Grok |
Key Features Advanced capabilities | ✓ Function Calling✓ Structured Output✓ Reasoning Mode |
| Grok 4 Fast | |
|---|---|
MMLU Measures knowledge across 57 subjects like law, math, history, and science | Not available |
MMMU Measures understanding of combined text and images across various domains | Not available |
HellaSwag Measures common sense reasoning by having models complete sentences about everyday situations | Not available |
See how Grok 4 Fast compares with other top models
Best models for coding and development
Models optimized for creative writing
Content creation and marketing tasks
Technical analysis and explanations
Scientific research and analysis
Multilingual translation tasks
