Add Vertex AI Batch Passthrough Support with Cost Tracking

[Sameerlite]

Title

Add Vertex AI Batch Passthrough Support with Cost Tracking

Relevant issues

Pre-Submission checklist

Please complete all items before asking a LiteLLM maintainer to review your PR

• I have Added testing in the tests/litellm/ directory, Adding at least 1 test is a hard requirement - see details
• I have added a screenshot of my new test passing locally
• My PR passes all unit tests on make test-unit
• My PR's scope is as isolated as possible, it only solves 1 specific problem

Type

🆕 New Feature

Changes

Configuration Example:

model_list:
  - model_name: gemini-1.5-flash
    litellm_params:
      model: vertex_ai/gemini-1.5-flash
      vertex_project: your-project-id
      vertex_location: us-central1
      vertex_credentials: path/to/service-account.json

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Project	Deployment	Preview	Comments	Updated (UTC)
litellm	Ready	Preview	Comment	Oct 22, 2025 5:14pm

[krrishdholakia]

still failing mapped tests @Sameerlite

[ishaan-jaff]

1 change - please please the doc in supported endpoints

[Sameerlite]

1 change - please please the doc in supported endpoints

Moved