xAI (Grok)
Configure xAI Grok models in BraceKit.
xAI (Grok)
xAI’s Grok models offer frontier-level reasoning with exceptional cost efficiency. BraceKit supports both chat and image generation.
Setup
1. Get an API Key
- Go to console.x.ai
- Sign in or create an account
- Navigate to API Keys
- Create a new key
2. Configure in BraceKit
- Open Settings → AI Provider
- Click xAI in the provider grid
- Paste your API key
- Select a model
Settings are saved automatically as you type.
Available Models
Grok 4.1 Series (Latest)
| Model | Best For | Context | Notes |
|---|---|---|---|
| grok-4-1-fast-reasoning | Complex reasoning | 2M | Extended thinking, best quality |
| grok-4-1-fast-non-reasoning | Fast responses | 2M | Quick, capable, cost-efficient |
Grok 4 Series
| Model | Best For | Context | Notes |
|---|---|---|---|
| grok-4 | Complex tasks | 131K | Reasoning model |
| grok-4-fast-reasoning | Reasoning | 2M | Faster reasoning variant |
| grok-4-fast-non-reasoning | General use | 2M | Fast, no reasoning |
Grok 3 Series
| Model | Best For | Context | Notes |
|---|---|---|---|
| grok-3 | General use | 131K | Balanced performance |
| grok-3-mini | Quick tasks | 131K | Faster, cheaper |
Image Generation
| Model | Best For | Notes |
|---|---|---|
| grok-2-image-1212 | Image generation | Latest image model |
| grok-imagine-image | Image generation | Standard quality |
| grok-imagine-image-pro | Image generation | Higher quality |
Features
Reasoning Mode
Grok 4 and 4.1 models are reasoning models that show their thinking process:
- Click the brain icon (🧠) in the toolbar
- Send your message
- View the reasoning in a collapsible section
Note: Grok 4 and 4.1 always use reasoning — there’s no non-reasoning mode for the base models. Use
grok-4-1-fast-non-reasoningorgrok-4-fast-non-reasoningfor quick responses without extended thinking.
Image Generation
Generate images with Grok:
- Select an image model (e.g.,
grok-imagine-image) - Choose an aspect ratio in the toolbar
- Describe the image
- Image appears in the response
You: Generate a futuristic city skyline at sunset
BraceKit: [Generated image appears here]See Image Generation for details.
Function Calling
Grok models support tool calling for:
- MCP server tools
- Built-in tools (Google Search)
Vision
Grok Vision models can analyze images:
- Attach images to messages
- Ask questions about them
Model Parameters
Configure in Settings → AI Provider under the Advanced section:
| Parameter | Range | Effect |
|---|---|---|
| Temperature | 0-2 | Higher = more creative |
| Max Tokens | 1-131K | Maximum response length |
Note: Reasoning models (Grok 4, Grok 4.1) don’t support
presencePenalty,frequencyPenalty, orstopparameters.
Image Generation Settings
| Aspect Ratio | Best For |
|---|---|
| auto | Model selects best (xAI only) |
| 1:1 | Profile pictures, icons |
| 16:9 | Banners, headers |
| 9:16 | Stories, mobile |
| 3:2 | Photography |
| 2:3 | Portrait photography |
Pricing
xAI pricing (per 1M tokens):
| Model | Input | Output | Context |
|---|---|---|---|
| grok-4-1-fast-reasoning | $0.20 | $0.50 | 2M |
| grok-4-0709 | $3.00 | $15.00 | 131K |
| grok-3 | $3.00 | $15.00 | 131K |
| grok-3-mini | $0.30 | $0.50 | 131K |
Note: Check xAI pricing for current rates. Image generation priced separately.
Troubleshooting
“API key invalid”
- Verify your key is correct
- Check the key hasn’t been revoked
- Ensure you have credits in your account
“Parameter not supported”
- Reasoning models don’t support
presencePenalty,frequencyPenalty,stop - Remove these parameters from your request
Image generation slow
- Image generation takes 10-30 seconds
- Complex prompts take longer
- Try simpler prompts for faster results
Model not available
- Some models require API tier upgrade
- Check xAI Console for your access
Related
- Gemini — Alternative image generation
- Image Generation — Full guide
- Configuration — All settings