Grok 4.3 Now Available via xAI API

Date: 2026-05-06 Version: OpenClaw 2026.3.13

grok-4.3 is now accessible via the xAI API at https://api.x.ai/v1 using a standard API key. This is the replacement for the older grok-4-1-fast-reasoning model (and related 4.1/4-fast variants), which are scheduled for deprecation on May 15, 2026.

We will be testing grok-4.3 to see how it performs for agentic work.

curl Examples

List all available models:

curl https://api.x.ai/v1/models \
  -H "Authorization: Bearer YOUR_XAI_API_KEY"

Simple query with grok-4.3:

curl https://api.x.ai/v1/chat/completions \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer YOUR_XAI_API_KEY" \
  -d '{
    "model": "grok-4.3",
    "messages": [
      { "role": "user", "content": "Hello" }
    ]
  }'

The xAI API is OpenAI-compatible, so standard OpenAI client libraries work with minimal changes (just swap the base URL and API key).