From 744aa0cd2ab1c6880ec07f4bfc0a8bddbe2d0e4f Mon Sep 17 00:00:00 2001
From: Aiden Cline <63023139+rekram1-node@users.noreply.github.com>
Date: Fri, 9 Oct 2026 15:43:04 -0500
Subject: [PATCH] refactor(ai): default Vertex location to global in shared
 helper (#54171)

---
 packages/ai/src/providers/google-vertex-chat.ts      | 2 +-
 packages/ai/src/providers/google-vertex-messages.ts  | 2 +-
 packages/ai/src/providers/google-vertex-mistral.ts   | 3 +--
 packages/ai/src/providers/google-vertex-responses.ts | 2 +-
 packages/ai/src/providers/google-vertex-shared.ts    | 4 ++--
 packages/ai/src/providers/google-vertex.ts           | 2 +-
 6 files changed, 7 insertions(+), 8 deletions(-)

diff --git a/packages/ai/src/providers/google-vertex-chat.ts b/packages/ai/src/providers/google-vertex-chat.ts
index 8a44ed6c8cb..d9126732752 100644
--- a/packages/ai/src/providers/google-vertex-chat.ts
+++ b/packages/ai/src/providers/google-vertex-chat.ts
@@ -47,7 +47,7 @@ const configuredRoute = (input: Config) => {
     project: inputProject,
     ...rest
   } = input
-  const location = GoogleVertexShared.location(inputLocation, "global")
+  const location = GoogleVertexShared.location(inputLocation)
   const project = GoogleVertexShared.project(inputProject)
   return route.with({
     ...rest,
diff --git a/packages/ai/src/providers/google-vertex-messages.ts b/packages/ai/src/providers/google-vertex-messages.ts
index 7e078a11800..56a0106fe86 100644
--- a/packages/ai/src/providers/google-vertex-messages.ts
+++ b/packages/ai/src/providers/google-vertex-messages.ts
@@ -77,7 +77,7 @@ const configuredRoute = (input: Config) => {
     project: inputProject,
     ...rest
   } = input
-  const location = GoogleVertexShared.location(inputLocation, "global")
+  const location = GoogleVertexShared.location(inputLocation)
   const project = GoogleVertexShared.project(inputProject)
   return route.with({
     ...rest,
diff --git a/packages/ai/src/providers/google-vertex-mistral.ts b/packages/ai/src/providers/google-vertex-mistral.ts
index 2c9a9808090..7bca01e54e4 100644
--- a/packages/ai/src/providers/google-vertex-mistral.ts
+++ b/packages/ai/src/providers/google-vertex-mistral.ts
@@ -63,8 +63,7 @@ const configuredRoute = (input: Config) => {
     project: inputProject,
     ...rest
   } = input
-  // Mistral is served from regional endpoints only; the global endpoint returns 404.
-  const location = GoogleVertexShared.location(inputLocation, "us-central1")
+  const location = GoogleVertexShared.location(inputLocation)
   const project = GoogleVertexShared.project(inputProject)
   return route.with({
     ...rest,
diff --git a/packages/ai/src/providers/google-vertex-responses.ts b/packages/ai/src/providers/google-vertex-responses.ts
index 6fb69c7651e..fcac5e15a4f 100644
--- a/packages/ai/src/providers/google-vertex-responses.ts
+++ b/packages/ai/src/providers/google-vertex-responses.ts
@@ -48,7 +48,7 @@ const configuredRoute = (input: Config) => {
     project: inputProject,
     ...rest
   } = input
-  const location = GoogleVertexShared.location(inputLocation, "global")
+  const location = GoogleVertexShared.location(inputLocation)
   const project = GoogleVertexShared.project(inputProject)
   return route.with({
     ...rest,
diff --git a/packages/ai/src/providers/google-vertex-shared.ts b/packages/ai/src/providers/google-vertex-shared.ts
index 76fa753965c..8c2bf89759f 100644
--- a/packages/ai/src/providers/google-vertex-shared.ts
+++ b/packages/ai/src/providers/google-vertex-shared.ts
@@ -21,12 +21,12 @@ export const project = (value?: string) =>
   process.env.GCP_PROJECT ??
   process.env.GCLOUD_PROJECT
 
-export const location = (value: string | undefined, fallback: string) =>
+export const location = (value: string | undefined) =>
   value ??
   process.env.GOOGLE_VERTEX_LOCATION ??
   process.env.GOOGLE_CLOUD_LOCATION ??
   process.env.VERTEX_LOCATION ??
-  fallback
+  "global"
 
 export const host = (location: string) => {
   if (location === "global") return "aiplatform.googleapis.com"
diff --git a/packages/ai/src/providers/google-vertex.ts b/packages/ai/src/providers/google-vertex.ts
index 4f5ad1ceee2..e5d5d53518d 100644
--- a/packages/ai/src/providers/google-vertex.ts
+++ b/packages/ai/src/providers/google-vertex.ts
@@ -91,7 +91,7 @@ const configuredRoute = (input: Config, modelID: string | ModelID) => {
       provider: id,
       message: "Google Vertex tuned models do not support Express Mode API keys",
     })
-  const location = GoogleVertexShared.location(inputLocation, "global")
+  const location = GoogleVertexShared.location(inputLocation)
   const project = GoogleVertexShared.project(inputProject)
   const endpoint =
     baseURL ??