Tarseek API

Usage & token accounting

Successful chat completions include a usage object with:

• prompt_tokens for input tokens
• completion_tokens including visible output
• completion_tokens_details.reasoning_tokens when reported
• prompt_tokens_details.cached_tokens for prompt cache hits when reported
• total_tokens
• cost — the exact USD credit debit for the successful request
• cost_details.currency — currently USD

A provider response without usage fails as provider_response_error and is not charged. Streaming returns the final usage and cost chunk when stream_options.include_usage is true.