diff --git a/.changeset/hot-crews-battle.md b/.changeset/hot-crews-battle.md
new file mode 100644
index 000000000..322bbc11f
--- /dev/null
+++ b/.changeset/hot-crews-battle.md
@@ -0,0 +1,5 @@
+---
+"@browserbasehq/stagehand": patch
+---
+
+Support full Google GenAI client options (to e.g. use Vertex AI, or control the region)
diff --git a/packages/core/lib/v3/agent/GoogleCUAClient.ts b/packages/core/lib/v3/agent/GoogleCUAClient.ts
index 968a542a4..035a60985 100644
--- a/packages/core/lib/v3/agent/GoogleCUAClient.ts
+++ b/packages/core/lib/v3/agent/GoogleCUAClient.ts
@@ -31,7 +31,6 @@ import { ToolSet } from "ai";
  * This implementation uses the Google Generative AI SDK for Computer Use
  */
 export class GoogleCUAClient extends AgentClient {
-  private apiKey: string;
   private client: GoogleGenAI;
   private currentViewport = { width: 1288, height: 711 };
   private currentUrl?: string;
@@ -53,16 +52,15 @@ export class GoogleCUAClient extends AgentClient {
 
     this.tools = tools;
     // Process client options
-    this.apiKey =
-      (clientOptions?.apiKey as string) ||
+    clientOptions = clientOptions || {};
+    clientOptions.apiKey =
+      (clientOptions.apiKey as string) ||
       process.env.GEMINI_API_KEY ||
       process.env.GOOGLE_GENERATIVE_AI_API_KEY ||
-      "";
+      undefined;
 
     // Initialize the Google Generative AI client
-    this.client = new GoogleGenAI({
-      apiKey: this.apiKey,
-    });
+    this.client = new GoogleGenAI(clientOptions);
 
     // Get environment if specified
     if (
@@ -90,9 +88,7 @@ export class GoogleCUAClient extends AgentClient {
     };
 
     // Store client options for reference
-    this.clientOptions = {
-      apiKey: this.apiKey,
-    };
+    this.clientOptions = clientOptions;
 
     // Initialize tools if provided
     if (this.tools && Object.keys(this.tools).length > 0) {
diff --git a/packages/core/lib/v3/llm/GoogleClient.ts b/packages/core/lib/v3/llm/GoogleClient.ts
index efd3cf925..61f33ccbf 100644
--- a/packages/core/lib/v3/llm/GoogleClient.ts
+++ b/packages/core/lib/v3/llm/GoogleClient.ts
@@ -8,10 +8,11 @@ import {
   FunctionCall,
   Schema,
   Type,
+  GoogleGenAIOptions as ClientOptions,
 } from "@google/genai";
 
 import { LogLine } from "../types/public/logs";
-import { AvailableModel, ClientOptions } from "../types/public/model";
+import { AvailableModel } from "../types/public/model";
 import {
   validateZodSchema,
   toGeminiSchema,
@@ -71,7 +72,7 @@ export class GoogleClient extends LLMClient {
   }: {
     logger: (message: LogLine) => void; // Added logger type
     modelName: AvailableModel;
-    clientOptions?: ClientOptions; // Expecting { apiKey: string } here
+    clientOptions?: ClientOptions;
   }) {
     super(modelName);
     if (!clientOptions?.apiKey) {
@@ -79,7 +80,7 @@ export class GoogleClient extends LLMClient {
       clientOptions.apiKey = loadApiKeyFromEnv("google_legacy", logger);
     }
     this.clientOptions = clientOptions;
-    this.client = new GoogleGenAI({ apiKey: clientOptions.apiKey });
+    this.client = new GoogleGenAI(clientOptions);
     this.modelName = modelName;
     this.logger = logger;
     // Determine vision capability based on model name (adjust as needed)
diff --git a/packages/core/lib/v3/types/public/model.ts b/packages/core/lib/v3/types/public/model.ts
index ea8aa57da..d7e3d6d20 100644
--- a/packages/core/lib/v3/types/public/model.ts
+++ b/packages/core/lib/v3/types/public/model.ts
@@ -1,5 +1,6 @@
 import type { ClientOptions as AnthropicClientOptions } from "@anthropic-ai/sdk";
 import type { LanguageModelV2 } from "@ai-sdk/provider";
+import { GoogleGenAIOptions as GoogleGenAIClientOptions } from "@google/genai";
 import type { ClientOptions as OpenAIClientOptions } from "openai";
 
 export type AnthropicJsonSchemaObject = {
@@ -66,7 +67,16 @@ export type ModelProvider =
   | "google"
   | "aisdk";
 
-export type ClientOptions = OpenAIClientOptions | AnthropicClientOptions;
+export type ClientOptions = (
+  | OpenAIClientOptions
+  | AnthropicClientOptions
+  | GoogleGenAIClientOptions
+) &
+  // aisdk client language model options
+  {
+    apiKey?: string;
+    baseURL?: string;
+  };
 
 export type ModelConfiguration =
   | AvailableModel