Grok 4 from xAI — strong reasoning with real-time context from X (formerly Twitter).
curl https://oneapikey.app/v1/v1/chat/completions \
-H "Authorization: Bearer $ONEAPIKEY_API_KEY" \
-H "X-APIMarket-Product: grok-4" \
-H "Content-Type: application/json" \
--data '{"model":"xai/grok-4","messages":[{"role":"user","content":"hi"}]}'