Enable the Vertex AI API and set up Google Application Default Credentials

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Configuration

config.yaml
models:
  - name: <MODEL_NAME>
    provider: vertexai
    model: <MODEL_ID>
    env:
      projectId: <PROJECT_ID>
      region: us-east5

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How to Enable Vertex AI Express Mode

You can use Vertex AI in express mode by only providing an API Key. Only some Gemini models are supported in express mode for now.
config.yaml
models:
  - name: <MODEL_NAME>
    provider: vertexai
    model: <MODEL_ID>
    apiKey: <YOUR_GOOGLE_CLOUD_API_KEY>