diff --git a/packages/opencode/src/provider/transform.ts b/packages/opencode/src/provider/transform.ts
index 3f409c525a..9e536eed58 100644
--- a/packages/opencode/src/provider/transform.ts
+++ b/packages/opencode/src/provider/transform.ts
@@ -35,6 +35,7 @@ export namespace ProviderTransform {
       case "@ai-sdk/google-vertex/anthropic":
         return "anthropic"
       case "@ai-sdk/google-vertex":
+        return "vertex"
       case "@ai-sdk/google":
         return "google"
       case "@ai-sdk/gateway":