### Check for existing issues

- [x] I have searched the existing issues and checked that my issue is not a duplicate.

### The Feature

Add the ability to exclude billing data for models marked as BYOK when pulling usage from the API.

### Motivation, pitch

We have two separate uses for LiteLLM.

1. Manage keys and usage for models that we provide access to, where we then bill each team at the end of the month for the usage accumulated. This is working for our purposes. 2. Users bring their own keys and then use LiteLLM for enforcing member-level budgeting on them. They pay for the usage of these directly. As a result, we do not want to include these models’ usage when we bill them. Zeroing out the input and output costs doesn’t work because that defeats the purpose of using it to put budgets on member use.

We want the ability to exclude BYOK accounting records so that they aren't charged twice (once using their own API key and once by us). We currently pull monthly usage using the /global/spend/report API.

### What part of LiteLLM is this about?

Other

### LiteLLM is hiring a founding backend engineer, are you interested in joining us and shipping to all our users?

No

### T…