curl --request GET \
  --url https://api.valarhq.ai/v1/batches/{batch_id}/{custom_id} \
  --header 'Authorization: Bearer <token>'

{
  "id": "<string>",
  "created_at": 123,
  "model": "<string>",
  "usage": {
    "input_tokens": 123,
    "input_tokens_details": {
      "cached_tokens": 123,
      "reasoning_tokens": 123
    },
    "output_tokens": 123,
    "output_tokens_details": {
      "cached_tokens": 123,
      "reasoning_tokens": 123
    },
    "total_tokens": 123,
    "prompt_tokens": 123,
    "completion_tokens": 123
  },
  "metadata": {},
  "input": "<string>",
  "output": "<string>",
  "error": {},
  "incomplete_details": {},
  "max_output_tokens": 123,
  "reasoning": {},
  "text": {
    "format": {}
  },
  "store": true,
  "temperature": 123,
  "top_p": 123,
  "parallel_tool_calls": true,
  "tool_choice": "<string>",
  "tools": [
    {}
  ],
  "truncation": "<string>",
  "user": "<string>"
}