curl -N https://api.llmgrid.ai/v1/chat/completions \
-H "Authorization: Bearer $LLMGRID_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"model": "gpt-4.1",
"messages": [{"role": "user", "content": "Stream a 2-sentence summary of caching."}],
"stream": true
}'