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.

The xAI row: name, scope, XAI_API_KEY and the routing handle xai.

Model names

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

Send a request

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