stepfun-ai Step 3.5 Flash API 가격 및 스펙

curl https://llm-router.cafe24.com/api/v1/chat/completions \
  -H "Authorization: Bearer sk-cafe24-YOUR_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "stepfun-ai/Step-3.5-Flash",
    "messages": [
      { "role": "user", "content": "Hello!" }
    ]
  }'