Vertex AI - Missing newer models and us-south1 region

[ssweens]

App Version

3.27.1

API Provider

Google Vertex AI

Model Used

N/A

Roo Code Task Links (Optional)

No response

🔁 Steps to Reproduce

Choose: GCP Vertex AI
Choose Any Region
Expect to see: https://console.cloud.google.com/vertex-ai/publishers/openai/model-garden/gpt-oss-120b-maas and others
in the models list.

💥 Outcome Summary

Expected to have:

• gpt-oss-120b-maas,
• gpt-oss-20b-maas,
• deepseek-r1-0528-maas,
• deepseek-v3.1-maas,
• qwen3-coder-480b-a35b-instruct-maas,
• qwen3-235b-a22b-instruct-2507-maas

in the model list and the needed us-south1 in the region list for the qwen models. But all are missing.

📄 Relevant Logs or Errors (Optional)

[roomote]

I'm exploring a potential fix for adding the missing Vertex AI models and us-south1 region. I'll open a PR to share progress.

[roomote]

Opened a PR with my attempt at addressing this issue: #7726

The PR adds all 6 requested models and the us-south1 region to the Vertex AI configuration. Most CI checks are passing, though there appear to be some unrelated test failures in the platform-unit-tests. Feedback welcome!

[ssweens]

Provided alternative PR that has updated Vertex provider test (new region needed adding to the test) and manually verified correct pricing and context sizes instead of hallucinated values: PR #7727