curl https://xmapi.site/v1/messages \
-H "Authorization: Bearer your-XMAI-api-key" \
-H "anthropic-version: 2023-06-01" \
-H "Content-Type: application/json" \
-d '{
"model": "claude-opus-4-8",
"max_tokens": 1024,
"messages": [{"role": "user", "content": "Explain what a race condition is."}]
}'