# What does this PR do?
update VertexAI inference provider to use openai-python for
openai-compat functions
## Test Plan
```
$ VERTEX_AI_PROJECT=... uv run llama stack build --image-type venv --providers inference=remote::vertexai --run
...
$ LLAMA_STACK_CONFIG=http://localhost:8321 uv run --group test pytest -v -ra --text-model vertexai/vertex_ai/gemini-2.5-flash tests/integration/inference/test_openai_completion.py
...
```
i don't have an account to test this. `get_api_key` may also need to be
updated per
https://cloud.google.com/vertex-ai/generative-ai/docs/start/openai
---------
Signed-off-by: Sébastien Han <seb@redhat.com>
Co-authored-by: Sébastien Han <seb@redhat.com>