LangMart: xAI: Grok 4 Fast
Model Overview
| Property | Value |
|---|---|
| Model ID | openrouter/x-ai/grok-4-fast |
| Name | xAI: Grok 4 Fast |
| Provider | x-ai |
| Released | 2025-09-19 |
Description
Grok 4 Fast is xAI's latest multimodal model with SOTA cost-efficiency and a 2M token context window. It comes in two flavors: non-reasoning and reasoning. Read more about the model on xAI's news post.
Reasoning can be enabled/disabled using the reasoning enabled parameter in the API. Learn more in our docs
Description
LangMart: xAI: Grok 4 Fast is a language model provided by x-ai. This model offers advanced capabilities for natural language processing tasks.
Provider
x-ai
Specifications
| Spec | Value |
|---|---|
| Context Window | 2,000,000 tokens |
| Modalities | text+image->text |
| Input Modalities | text, image |
| Output Modalities | text |
Pricing
| Type | Price |
|---|---|
| Input | $0.20 per 1M tokens |
| Output | $0.50 per 1M tokens |
Capabilities
- Include reasoning
- Logprobs
- Max tokens
- Reasoning
- Response format
- Seed
- Structured outputs
- Temperature
- Tool choice
- Tools
- Top logprobs
- Top p