xAI: Grok 4.1 Fast

Grok

Multimodal

Free

Grok 4.1 Fast is xAI's best agentic tool calling model that shines in real-world use cases like customer support and deep research. 2M context window. Reasoning can be enabled/disabled using the `reasoning` `enabled` parameter in the API. [Learn more in our docs](https://openrouter.ai/docs/use-cases/reasoning-tokens#controlling-reasoning-tokens)

Parameters

Context Window

2,000,000

tokens

Input Price

per 1M tokens

Output Price

per 1M tokens

Capabilities

Model capabilities and supported modalities

Performance

Reasoning

Excellent reasoning capabilities with strong logical analysis

Math

Coding

Knowledge

Modalities

Input Modalities

text,image

Output Modalities

text

LLM Price Calculator

Calculate the cost of using this model

Input Tokens (0.00000000/token)$0.000000

Output Tokens (0.00000000/token)$0.000000

Common Scenarios:

Input Cost:$0.000000

Output Cost:$0.000000

Total Cost:$0.000000

Estimated usage: 4,500 tokens

Monthly Cost Estimator

Based on different usage levels

Light Usage

$0.0000

~10 requests

Moderate Usage

$0.0000

~100 requests

Heavy Usage

$0.0000

~1000 requests

Enterprise

$0.0000

~10,000 requests

Note: Estimates based on current token count settings per request.

Last Updated: 1970/01/21