curl --location '/v1/chat/completions' \
--header 'Authorization: Bearer <token>' \
--header 'Content-Type: text/plain' \
--data '{
  "model": "deepseek-v4.1-flash",
  "messages": [
    {
      "role": "system",
      "content": "You are a helpful assistant."
    },
    {
      "role": "user",
      "content": "Hello!"
    }
  ],
  "thinking": {
    "type": "enabled"
  },
  "reasoning_effort": "high",
  "stream": false
}'