xAI: Grok 4 Fast

Grok

Multimodal

Paid

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](http://x.ai/news/grok-4-fast). Reasoning can be enabled using the `reasoning` `enabled` parameter in the API. [Learn more in our docs](https://openrouter.ai/docs/use-cases/reasoning-tokens#controlling-reasoning-tokens) Prompts and completions on Grok 4 Fast Free may be used by xAI or OpenRouter to improve future models.

Parameters

Context Window

2,000,000

tokens

Input Price

$0.2

per 1M tokens

Output Price

$0.5

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 (0.00000020/token)$0.000300

Output Tokens (0.00000050/token)$0.001500

Common Scenarios:

Input Cost:$0.000300

Output Cost:$0.001500

Total Cost:$0.001800

Estimated usage: 4,500 tokens

Monthly Cost Estimator

Based on different usage levels

Light Usage

$0.0070

~10 requests

Moderate Usage

$0.0700

~100 requests

Heavy Usage

$0.7000

~1000 requests

Enterprise

$7.0000

~10,000 requests

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

Last Updated: 1970/01/21