Can't make open interpreter work with Google Vertex. What am I doing wrong?

[sturdy parrot]

Here's what im trying, in a colab.
!pip install open-interpreter google-cloud-aiplatform

authenticating my notebook

PROJECT_ID = "MYGCP PROJECT"
auth.authenticate_user(project_id=PROJECT_ID)```

using open interpreter

import interpreter
interpreter.model = "vertex_ai/codechat-bison" # Set the model name

I keep getting malformed responses like this screenshot

What am i doing wrong?

[dry meteor]

why are you using vertex