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Ollama’s API responses include metrics that can be used for measuring performance and model usage:
  • total_duration: How long the response took to generate
  • load_duration: How long the model took to load
  • prompt_eval_count: How many input tokens were processed
  • prompt_eval_duration: How long it took to evaluate the prompt
  • eval_count: How many output tokens were processes
  • eval_duration: How long it took to generate the output tokens
All timing values are measured in nanoseconds.

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Example response

For endpoints that return usage metrics, the response body will include the usage fields. For example, a non-streaming call to /api/generate may return the following response: 
{
  "model": "gemma3",
  "created_at": "2025-10-17T23:14:07.414671Z",
  "response": "Hello! How can I help you today?",
  "done": true,
  "done_reason": "stop",
  "total_duration": 174560334,
  "load_duration": 101397084,
  "prompt_eval_count": 11,
  "prompt_eval_duration": 13074791,
  "eval_count": 18,
  "eval_duration": 52479709
}
For endpoints that return streaming responses, usage fields are included as part of the final chunk, where done is true.