diff --git a/sdk/typescript/src/exec.ts b/sdk/typescript/src/exec.ts
index 0369f867..010f723f 100644
--- a/sdk/typescript/src/exec.ts
+++ b/sdk/typescript/src/exec.ts
@@ -1,12 +1,16 @@
 import { spawn } from "child_process";
 import readline from "node:readline";
 
+import { SandboxMode } from "./turnOptions";
+
 export type CodexExecArgs = {
   input: string;
 
   baseUrl?: string;
   apiKey?: string;
   threadId?: string | null;
+  model?: string;
+  sandboxMode?: SandboxMode;
 };
 
 export class CodexExec {
@@ -17,6 +21,15 @@ export class CodexExec {
 
   async *run(args: CodexExecArgs): AsyncGenerator<string> {
     const commandArgs: string[] = ["exec", "--experimental-json"];
+
+    if (args.model) {
+      commandArgs.push("--model", args.model);
+    }
+
+    if (args.sandboxMode) {
+      commandArgs.push("--sandbox", args.sandboxMode);
+    }
+
     if (args.threadId) {
       commandArgs.push("resume", args.threadId, args.input);
     } else {
diff --git a/sdk/typescript/src/index.ts b/sdk/typescript/src/index.ts
index 02bbfa1b..93557fb6 100644
--- a/sdk/typescript/src/index.ts
+++ b/sdk/typescript/src/index.ts
@@ -27,3 +27,5 @@ export type { Thread, RunResult, RunStreamedResult, Input } from "./thread";
 export type { Codex } from "./codex";
 
 export type { CodexOptions } from "./codexOptions";
+
+export type { TurnOptions, ApprovalMode, SandboxMode } from "./turnOptions";
diff --git a/sdk/typescript/src/thread.ts b/sdk/typescript/src/thread.ts
index cd19a942..3e380e0a 100644
--- a/sdk/typescript/src/thread.ts
+++ b/sdk/typescript/src/thread.ts
@@ -2,6 +2,7 @@ import { CodexOptions } from "./codexOptions";
 import { ThreadEvent } from "./events";
 import { CodexExec } from "./exec";
 import { ThreadItem } from "./items";
+import { TurnOptions } from "./turnOptions";
 
 export type RunResult = {
   items: ThreadItem[];
@@ -25,16 +26,21 @@ export class Thread {
     this.id = id;
   }
 
-  async runStreamed(input: string): Promise<RunStreamedResult> {
-    return { events: this.runStreamedInternal(input) };
+  async runStreamed(input: string, options?: TurnOptions): Promise<RunStreamedResult> {
+    return { events: this.runStreamedInternal(input, options) };
   }
 
-  private async *runStreamedInternal(input: string): AsyncGenerator<ThreadEvent> {
+  private async *runStreamedInternal(
+    input: string,
+    options?: TurnOptions,
+  ): AsyncGenerator<ThreadEvent> {
     const generator = this.exec.run({
       input,
       baseUrl: this.options.baseUrl,
       apiKey: this.options.apiKey,
       threadId: this.id,
+      model: options?.model,
+      sandboxMode: options?.sandboxMode,
     });
     for await (const item of generator) {
       const parsed = JSON.parse(item) as ThreadEvent;
@@ -45,8 +51,8 @@ export class Thread {
     }
   }
 
-  async run(input: string): Promise<RunResult> {
-    const generator = this.runStreamedInternal(input);
+  async run(input: string, options?: TurnOptions): Promise<RunResult> {
+    const generator = this.runStreamedInternal(input, options);
     const items: ThreadItem[] = [];
     let finalResponse: string = "";
     for await (const event of generator) {
diff --git a/sdk/typescript/src/turnOptions.ts b/sdk/typescript/src/turnOptions.ts
new file mode 100644
index 00000000..c414334d
--- /dev/null
+++ b/sdk/typescript/src/turnOptions.ts
@@ -0,0 +1,8 @@
+export type ApprovalMode = "never" | "on-request" | "on-failure" | "untrusted";
+
+export type SandboxMode = "read-only" | "workspace-write" | "danger-full-access";
+
+export type TurnOptions = {
+  model?: string;
+  sandboxMode?: SandboxMode;
+};
diff --git a/sdk/typescript/tests/codexExecSpy.ts b/sdk/typescript/tests/codexExecSpy.ts
new file mode 100644
index 00000000..9028b6e6
--- /dev/null
+++ b/sdk/typescript/tests/codexExecSpy.ts
@@ -0,0 +1,29 @@
+import * as child_process from "child_process";
+
+jest.mock("child_process", () => {
+  const actual = jest.requireActual<typeof import("child_process")>("child_process");
+  return { ...actual, spawn: jest.fn(actual.spawn) };
+});
+
+const actualChildProcess = jest.requireActual<typeof import("child_process")>("child_process");
+const spawnMock = child_process.spawn as jest.MockedFunction<typeof actualChildProcess.spawn>;
+
+export function codexExecSpy(): { args: string[][]; restore: () => void } {
+  const previousImplementation =
+    spawnMock.getMockImplementation() ?? actualChildProcess.spawn;
+  const args: string[][] = [];
+
+  spawnMock.mockImplementation(((...spawnArgs: Parameters<typeof child_process.spawn>) => {
+    const commandArgs = spawnArgs[1];
+    args.push(Array.isArray(commandArgs) ? [...commandArgs] : []);
+    return previousImplementation(...spawnArgs);
+  }) as typeof actualChildProcess.spawn);
+
+  return {
+    args,
+    restore: () => {
+      spawnMock.mockClear();
+      spawnMock.mockImplementation(previousImplementation);
+    },
+  };
+}
diff --git a/sdk/typescript/tests/run.test.ts b/sdk/typescript/tests/run.test.ts
index 7f6c57c2..093adee4 100644
--- a/sdk/typescript/tests/run.test.ts
+++ b/sdk/typescript/tests/run.test.ts
@@ -1,5 +1,6 @@
 import path from "path";
 
+import { codexExecSpy } from "./codexExecSpy";
 import { describe, expect, it } from "@jest/globals";
 
 import { Codex } from "../src/codex";
@@ -130,4 +131,56 @@ describe("Codex", () => {
       await close();
     }
   });
+
+  it("passes turn options to exec", async () => {
+    const { url, close, requests } = await startResponsesTestProxy({
+      statusCode: 200,
+      responseBodies: [
+        sse(
+          responseStarted("response_1"),
+          assistantMessage("Turn options applied", "item_1"),
+          responseCompleted("response_1"),
+        ),
+      ],
+    });
+
+    const { args: spawnArgs, restore } = codexExecSpy();
+
+    try {
+      const client = new Codex({ executablePath: codexExecPath, baseUrl: url, apiKey: "test" });
+
+      const thread = client.startThread();
+      await thread.run("apply options", {
+        model: "gpt-test-1",
+        sandboxMode: "workspace-write",
+      });
+
+      const payload = requests[0];
+      expect(payload).toBeDefined();
+      const json = payload!.json as { model?: string } | undefined;
+
+      expect(json?.model).toBe("gpt-test-1");
+      expect(spawnArgs.length).toBeGreaterThan(0);
+      const commandArgs = spawnArgs[0];
+
+      expectPair(commandArgs, ["--sandbox", "workspace-write"]);
+      expectPair(commandArgs, ["--model", "gpt-test-1"]);
+  
+    } finally {
+      restore();
+      await close();
+    }
+  });
 });
+
+
+function expectPair(args: string[] | undefined, pair: [string, string]) {
+  if (!args) {
+    throw new Error("Args is undefined");
+  }
+  const index = args.indexOf(pair[0]);
+  if (index === -1) {
+    throw new Error(`Pair ${pair[0]} not found in args`);
+  }
+  expect(args[index + 1]).toBe(pair[1]);
+}