diff --git a/package.json b/package.json
index 43a57af..5f250a7 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@hyperbrowser/sdk",
-  "version": "1.2.1",
+  "version": "1.2.2",
   "description": "Node SDK for Hyperbrowser API",
   "author": "",
   "repository": {
diff --git a/src/types/agents/gemini-computer-use.ts b/src/types/agents/gemini-computer-use.ts
index 090cfce..76fcebd 100644
--- a/src/types/agents/gemini-computer-use.ts
+++ b/src/types/agents/gemini-computer-use.ts
@@ -1,4 +1,8 @@
-import { GeminiComputerUseLlm, GeminiComputerUseTaskStatus } from "../constants";
+import {
+  GeminiComputerUseLlm,
+  GeminiComputerUseReasoningEffort,
+  GeminiComputerUseTaskStatus,
+} from "../constants";
 import { CreateSessionParams } from "../session";
 
 export interface GeminiComputerUseApiKeys {
@@ -8,6 +12,7 @@ export interface GeminiComputerUseApiKeys {
 export interface StartGeminiComputerUseTaskParams {
   task: string;
   llm?: GeminiComputerUseLlm;
+  reasoningEffort?: GeminiComputerUseReasoningEffort;
   sessionId?: string;
   maxFailures?: number;
   maxSteps?: number;
diff --git a/src/types/constants.ts b/src/types/constants.ts
index f256f35..e8ecf84 100644
--- a/src/types/constants.ts
+++ b/src/types/constants.ts
@@ -112,6 +112,7 @@ export type HyperAgentLlm =
   | "gemini-3-flash-preview";
 
 export type GeminiComputerUseLlm =
+  | "gemini-4-argon"
   | "gemini-3.8-flash"
   | "gemini-3.7-flash"
   | "gemini-3.6-flash"
@@ -120,6 +121,9 @@ export type GeminiComputerUseLlm =
   | "gemini-3-flash-preview"
   | "gemini-2.5-computer-use-preview-10-2025";
 
+// Gemini 4 Argon, 3.8 Flash, and 3.7 Flash do not support "minimal".
+export type GeminiComputerUseReasoningEffort = "minimal" | "low" | "medium" | "high";
+
 export type GrokComputerUseLlm = "grok-4.7" | "grok-4.6" | "grok-4.5";
 
 export type GrokReasoningEffort = "low" | "medium" | "high";
diff --git a/src/types/index.ts b/src/types/index.ts
index d18cece..711506f 100644
--- a/src/types/index.ts
+++ b/src/types/index.ts
@@ -307,6 +307,7 @@ export {
   CuaLlm,
   CuaReasoningEffort,
   GeminiComputerUseLlm,
+  GeminiComputerUseReasoningEffort,
   GrokComputerUseLlm,
   GrokReasoningEffort,
   MetaComputerUseLlm,
diff --git a/tests/integration/client-http.test.ts b/tests/integration/client-http.test.ts
index 43bd321..04e22f3 100644
--- a/tests/integration/client-http.test.ts
+++ b/tests/integration/client-http.test.ts
@@ -68,6 +68,11 @@ const startServer = async (
       return;
     }
 
+    if (request.method === "POST" && request.url === "/api/task/gemini-computer-use") {
+      sendJson(response, 200, { jobId: "gemini_job_123", liveUrl: null });
+      return;
+    }
+
     if (request.method === "POST" && request.url === "/api/task/meta-computer-use") {
       sendJson(response, 200, { jobId: "meta_job_123", liveUrl: null });
       return;
@@ -392,6 +397,70 @@ describe("client HTTP integration", () => {
     ]);
   });
 
+  test("Gemini Computer Use forwards Gemini 4 Argon and reasoning effort on start", async () => {
+    const server = await startServer();
+    servers.push(server);
+    const client = new HyperbrowserClient({
+      apiKey: "test-api-key",
+      baseUrl: server.baseUrl,
+    });
+
+    const started = await client.agents.geminiComputerUse.start({
+      task: "Complete the task",
+      llm: "gemini-4-argon",
+      reasoningEffort: "high",
+      useCustomApiKeys: true,
+      apiKeys: { google: "google-key" },
+    });
+    await client.agents.geminiComputerUse.start({
+      task: "Complete the task",
+      llm: "gemini-3.6-flash",
+      reasoningEffort: "minimal",
+    });
+    await client.agents.geminiComputerUse.start({
+      task: "Complete the task",
+      llm: "gemini-4-argon",
+    });
+
+    expect(started).toEqual({ jobId: "gemini_job_123", liveUrl: null });
+    expect(server.requests).toEqual([
+      {
+        method: "POST",
+        url: "/api/task/gemini-computer-use",
+        apiKey: "test-api-key",
+        contentType: "application/json",
+        body: {
+          task: "Complete the task",
+          llm: "gemini-4-argon",
+          reasoningEffort: "high",
+          useCustomApiKeys: true,
+          apiKeys: { google: "google-key" },
+        },
+      },
+      {
+        method: "POST",
+        url: "/api/task/gemini-computer-use",
+        apiKey: "test-api-key",
+        contentType: "application/json",
+        body: {
+          task: "Complete the task",
+          llm: "gemini-3.6-flash",
+          reasoningEffort: "minimal",
+        },
+      },
+      {
+        method: "POST",
+        url: "/api/task/gemini-computer-use",
+        apiKey: "test-api-key",
+        contentType: "application/json",
+        body: {
+          task: "Complete the task",
+          llm: "gemini-4-argon",
+        },
+      },
+    ]);
+  });
+
   test.each(["muse-spark-1.3", "muse-wonder-1.0"] as const)(
     "Meta Computer Use starts, polls, reads, and stops a %s task",
     async (llm) => {