| input_tokens | Number of tokens in the prompt/input to the model. |
| output_tokens | Number of tokens generated by the model as output. |
| total_tokens | Total tokens used (input + output). |
| audio_input_tokens | Audio tokens in the input. |
| audio_output_tokens | Audio tokens in the output. |
| audio_total_tokens | Total audio tokens (if using audio input/output). |
| cache_read_tokens | Tokens served from cache (if caching is used). |
| cache_write_tokens | Tokens written to cache. |
| reasoning_tokens | Tokens used for reasoning steps (if enabled). |
| time_to_first_token | Time until the first token is generated (in seconds). |
| duration | Total run time (in seconds). |
| provider_metrics | Provider-specific metrics (dict). |
| additional_metrics | Any extra metrics provided by the model/tool (e.g., latency, cost, etc.). |
