What is the "at-cost" cost for BYOK vs VAPI?

We are evaluating whether we should bring our own provider keys to VAPI or if we should use the VAPI resources for our agents. We understand that VAPI probably has entreprise contracts that bring costs and latency down, but we can't find the information on how much of a difference it would be.

Is there information anywhere on what these cost reductions would be?
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