mdonaj

[Bug]: Incorrect Usage Aggregation for Anthropic Streaming with Caching

11

### What happened? Response from anthropic reports cache usage stats. Response from litellm comes back with no cache information. I've debugged it locally. This might be helpful to figure it...

Fix: Prevent cache token overwrite by last chunk in streaming usage

2

## Relevant issues Fixes #10240 ## Pre-Submission checklist **Please complete all items before asking a LiteLLM maintainer to review your PR** - [X] I have Added testing in the [`tests/litellm/`](https://github.com/BerriAI/litellm/tree/main/tests/litellm)...