One of the faults of the usage page in the platform site: that token count on the right side? It only shows input tokens. Generated tokens are completely missing from that overview.
You will have to select a date range to investigate, and then drill down further, by endpoint, seeing model token counts for input and output, which then can only be correlated by daily costs in a “group by → line item” and then hovering over the day’s tally.
Ultimate transparency of token consumption is to record them yourself, pulling the usage out of every API call you make, through a proxy. Then you can see the usage delivered and overbilling.