---
title: OpenAI CUA | Lightcone
description: Run OpenAI's Computer-Using Agent on Lightcone browser sessions.
---

Run [OpenAI’s Computer-Using Agent (CUA)](https://platform.openai.com/docs/guides/computer-use) on Lightcone cloud browsers. CUA is OpenAI’s protocol for AI agents that see and interact with computer screens. Lightcone provides the sandboxed browser environment; OpenAI’s CUA model provides the vision and reasoning.

## How it works

1. Create a Lightcone browser session
2. Connect to it via Playwright using the CDP endpoint
3. Run the OpenAI CUA loop — the model sees screenshots, decides actions, and Playwright executes them

## Setup

Terminal window

```
pip install tzafon playwright openai
playwright install chromium
```

## Example

```
from tzafon import Lightcone
from playwright.sync_api import sync_playwright
from openai import OpenAI


# Create a Lightcone browser session
lc = Lightcone()
session = lc.computers.create(kind="browser")


# Get the CDP endpoint
cdp_url = session.endpoints.get("cdp")


# Connect Playwright to the remote browser
with sync_playwright() as p:
    browser = p.chromium.connect_over_cdp(cdp_url)
    page = browser.contexts[0].pages[0]


    # Navigate
    page.goto("https://example.com")


    # Take a screenshot for CUA
    screenshot = page.screenshot()


    # Use OpenAI CUA to reason about the page
    client = OpenAI()
    response = client.responses.create(
        model="computer-use-preview",
        tools=[{
            "type": "computer_use_preview",
            "display_width": 1280,
            "display_height": 720,
            "environment": "browser",
        }],
        input=[{
            "role": "user",
            "content": [
                {"type": "input_text", "text": "Find the main heading on this page"},
                {"type": "input_image", "image_url": f"data:image/png;base64,{screenshot.hex()}"},
            ],
        }],
    )


    print(response.output)


    browser.close()


lc.computers.delete(session.id)
```

You can also use Lightcone’s built-in [Responses API](/guides/responses-api/index.md) with `tzafon.northstar-cua-fast` for computer-use tasks without needing the OpenAI SDK. See the [CUA protocol guide](/guides/cua-protocol/index.md).

## Why use Lightcone with OpenAI CUA?

- **Stealth browsers** — Lightcone’s browsers include anti-detection features that prevent sites from blocking automation
- **Residential proxies** — Route traffic through residential IPs for additional stealth
- **Session persistence** — Save and restore browser state (cookies, local storage) across runs
- **Scalability** — Spin up hundreds of concurrent browser sessions

## Resources

- [OpenAI CUA documentation](https://platform.openai.com/docs/guides/computer-use)
- [openai-cua-sample-app](https://github.com/openai/openai-cua-sample-app)
- [Lightcone Playwright integration](/integrations/playwright/index.md)

## See also

- [**CUA protocol guide**](/guides/cua-protocol/index.md) — build a CUA loop with Lightcone’s native API
- [**Anthropic Claude**](/integrations/anthropic-claude/index.md) — Claude’s computer-use with Lightcone
- [**Playwright**](/integrations/playwright/index.md) — CDP connection details