# Grok 4 Fast

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 tokens
- **Model name:** `grok-4-fast-reasoning`
- **Aliases:** `grok-4-fast`, `grok-4-fast-reasoning-latest`

## Capabilities

- **Function calling:** Yes
- **Structured outputs:** Yes
- **Reasoning:** Yes

## Pricing

| Type | Price per 1M tokens |
| --- | --- |
| Input | $0.20 |
| Cached input | $0.05 |
| Output | $0.50 |

## Rate limits

| Limit | Value |
| --- | --- |
| Requests per minute | 600 |
| Tokens per minute | 4,000,000 |

## Regions

Available in: us-east-1, eu-west-1