We're excited to release grok-4-fast, our latest advancement in cost-efficient reasoning models.
At a glance
Modalities
Text, Image
Text
Context window
2,000,000
Pricing
Capabilities
Function calling
Connect the xAI model to external tools and systems.
Structured outputs
Return responses in specific, organized formats.
Reasoning
The model can think before responding.
Pricing
Input
Tokens
$0.20/ 1M tokens
Cached tokens
$0.05/ 1M tokens
Output
Tokens
$0.50/ 1M tokens
You are charged for each token used when making calls to our API.
Using cached input tokens can significantly reduce your costs.
This model is available on multiple clusters, you can find full regional based pricing below.
We charge different rates for requests which exceed the 128K context window
Details
Model name
Aliases
| Region | us-east-1, eu-west-1 |
|---|---|
| Rate limits | |
| Requests per minute | 600 |
| Tokens per minute | 4,000,000 |