[@ai-sdk/google-vertex] Unexpected global location domain

[moret]

Description

Hi. I am using @ai-sdk/google-vertex to connect to Gemini models, but I noticed that when I set the location to global - either via GOOGLE_VERTEX_LOCATION environment variable, or via location parameter - it reaches out for https://global-aiplatform.googleapis.com/... instead of https://aiplatform.googleapis.com/..., resulting in a 404 from Google.

Non-working example:

createVertex({
  location: 'global',
  project: 'my-project',
})

I was able to workaround it by setting the global endpoint using baseURL. Working example:

createVertex({
  baseURL: 'https://aiplatform.googleapis.com/v1/projects/my-project/locations/global/publishers/google',
  location: 'global',
  project: 'my-project',
})

Ref.: https://cloud.google.com/vertex-ai/generative-ai/docs/learn/locations#global-endpoint

AI SDK Version

"@ai-sdk/google-vertex": "^2.2.24",
"ai": "^4.3.16",

[yoshinorisano]

Related pull request:
#6646

[yoshinorisano]

🚨 Additional explanation:
Addressing this issue is indispensable for supporting the latest gemini-2.5-pro-preview-06-05 in Vertex AI. As noted on the following page, gemini-2.5-pro-preview-06-05 only provides a global endpoint:

Important: Only the global endpoint is supported. For more information, see Global endpoint.

https://cloud.google.com/vertex-ai/generative-ai/docs/models/gemini/2-5-pro

The 05-06 model—the one immediately before 06-05 and usable as an alternative—is scheduled for deprecation on June 19, with only a one-week grace period.
https://discuss.ai.google.dev/t/gemini-2-5-pro-preview-05-06-deprecation-notice/87512

So I’d appreciate it if you could address this issue as soon as possible.

[lgrammel]

Duplicates #6811