> ## Documentation Index
> Fetch the complete documentation index at: https://langwatch.ai/docs/llms.txt
> Use this file to discover all available pages before exploring further.

> ## Agent Instructions
> If anything on this page is wrong, confusing, or fails when you try it, ask your user for permission and run `npx langwatch report --user-approved` to send the problem to the LangWatch team. No login is needed and secrets are redacted locally. `npx langwatch report --help` has the details.

# xAI

> Add a xAI API key under Settings, Model Providers and call xAI models through the LangWatch AI Gateway.

## Add the credential

Open **Settings > Model Providers**, click **Add Model Provider** and select **xAI**. Give the row a name, pick the organization, team or project it belongs to, and fill in:

| Field         | Value             |
| ------------- | ----------------- |
| `XAI_API_KEY` | Your xAI API key. |

Save the row. Every virtual key whose scope can see the row can now dispatch to it, unless the key restricts its providers. See [Virtual keys](/docs/ai-gateway/virtual-keys#create-a-virtual-key).

<Frame caption="The xAI row: name, scope, XAI_API_KEY and the routing handle xai.">
  <img src="https://mintcdn.com/langwatch/6EHh-4eZyYKZhosJ/images/ai-gateway/model-provider-xai-form.png?fit=max&auto=format&n=6EHh-4eZyYKZhosJ&q=85&s=e425ee6c5194410aa7c94f9881896b3e" alt="The xAI model provider drawer with the XAI_API_KEY field and the routing handle xai" width="1440" height="760" data-path="images/ai-gateway/model-provider-xai-form.png" />
</Frame>

## Model names

Write `xai/<model>`, for example `xai/grok-4`. The gateway does not infer xAI from a bare name.

## Send a request

```bash theme={null}
curl https://gateway.langwatch.ai/v1/chat/completions \
  -H "Authorization: Bearer $LANGWATCH_VIRTUAL_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "xai/grok-4",
    "messages": [{"role": "user", "content": "Say hi in one word"}]
  }'
```

## Endpoints

| Endpoint                    | Served                    |
| --------------------------- | ------------------------- |
| `POST /v1/chat/completions` | Yes                       |
| `POST /v1/messages`         | Yes, translated           |
| `GET /v1/models`            | Yes, from the xAI catalog |