Enter monthly usage and pick the models to price. Each one is costed twice, on its official channel and on its cheapest paid channel. Cache hit rate is a separate input because cached input is billed far below the normal input price.
Monthly cost = input×(1−hit)×price + input×hit×cache-read + output×price. Channels without a cache-read price fall back to the input price. $0 channels are excluded, since free tiers usually have rate limits and no SLA. Gateway channels may carry hidden limits, so verify availability yourself.