Export your aggregated usage data as CSV or PDF from the Activity page.
The Activity page shows three metrics:
Filter by time period (1 Hour, 1 Day, 1 Month, 1 Year) and group by Model, API Key, or Creator (org member). Each time period is sub-grouped by minute, hour, day, and month, respectively.
Dollars spent for external BYOK usage is estimated based on market rates for that provider, and don’t reflect any discounts you might have from them.

This exports a summary of all three metrics. For detailed breakdowns, click into a specific metric first.
Click any metric card to expand it. From there you can:

For example, a detailed “Tokens by API Key” export to pdf for the last year. It starts with a summary page for all keys, and then granular breakdowns for each key individually:

Reasoning tokens are included in completion tokens for billing. This shows how many of the completion tokens were used thinking before responding.