 Grok 4.1 Fast | Grok 4 Fast | |
|---|---|---|
Model Provider The organization behind this AI's development | XAI | XAI |
Input Context Window Maximum input tokens this model can process at once | 2M tokens | 2M tokens |
Output Token Limit Maximum output tokens this model can generate at once | 30K tokens | 30K tokens |
Release Date When this model first became publicly available | November 19, 2025 4 days ago November 19th, 2025 | September 19, 2025 2 months ago September 19th, 2025 |
Grok 4.1 Fast | Grok 4 Fast | |
|---|---|---|
Input Types Supported input formats | 📝Text🖼️Image | 📝Text🖼️Image |
Output Types Supported output formats | 📝Text | 📝Text |
Tokenizer Text encoding system | Grok | Grok |
Key Features Advanced capabilities | ✓Function Calling✓Structured Output✓Reasoning ModeContent Moderation | ✓Function Calling✓Structured Output✓Reasoning ModeContent Moderation |
| Grok 4.1 Fast | Grok 4 Fast | |
|---|---|---|
Input Token Cost Cost per million input tokens | Not specified | $0.20 per million tokens |
Output Token Cost Cost per million outut tokens | Not specified | $0.50 per million tokens |
| Grok 4.1 Fast | Grok 4 Fast | |
|---|---|---|
MMLU Measures knowledge across 57 subjects like law, math, history, and science | Benchmark not available. | Benchmark not available. |
MMMU Measures understanding of combined text and images across various domains | Benchmark not available. | Benchmark not available. |
HellaSwag Measures common sense reasoning by having models complete sentences about everyday situations | Benchmark not available. | Benchmark not available. |
Grok 4.1 Fast by XAI understands both text and images, can use external tools and APIs, offers advanced reasoning, generates structured data. It can handle standard conversations with its 2M token context window. Released November 19th, 2025.Grok 4 Fast by XAI understands both text and images, can use external tools and APIs, offers advanced reasoning, generates structured data. It can handle standard conversations with its 2M token context window. Very affordable at $0.20/M input and $0.50/M output tokens. Released September 19th, 2025.Compare your models with top performers across different categories
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